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Interrupt List Release 47 Last change 8/13/95
This compilation is Copyright (c) 1989,1990,1991,1992,1993,1994,1995 Ralf Brown
--------!---FILELIST-------------------------
Please redistribute the following files unmodified as a group, in a quartet of
archives named INTER47A through INTER47D (preferably the original authenticated
PKZIP archives):
INTERRUP.1ST the read-me file, containing credits, availability info
INTERRUP.A INT 00 through INT 13/2F \
INTERRUP.B INT 13/30 through INT 15/4F\
INTERRUP.C INT 15/50 through INT 1A/5F \
INTERRUP.D INT 1A through INT 21/43 \ total 1856 pages at
INTERRUP.E INT 21/44 through INT 21/5F \ 60 lines per page,
INTERRUP.F INT 21/60 through INT 21/FE > 1979 with INTPRINT -p
INTERRUP.G INT 21/FF through INT 2F/42 / (7400 entries)
INTERRUP.H INT 2F/43 through INT 2F/CF / (2734 tables)
INTERRUP.I INT 2F/D0 through INT 5A /
INTERRUP.J INT 5B through INT 61 /
INTERRUP.K INT 62 through INT 6E /
INTERRUP.L INT 6F through INT 7F /
INTERRUP.M INT 80 through INT FF /
INTERRUP.PRI a brief introduction to interrupts
INTPRINT.COM a simple formatter that also generates a list summary
INTPRINT.DOC instructions for INTPRINT
OVERVIEW.LST brief listing of major uses of each interrupt
86BUGS.LST a listing of CPU bugs and undocumented features
CMOS.LST a description of the CMOS RAM data bytes
FARCALL.LST APIs available through FAR CALLs
GLOSSARY.LST a glossary of terms, abbreviations, and acronyms
MEMORY.LST format of the BIOS data area
OPCODES.LST a listing of recent and undocumented CPU instructions
PORTS.LST a listing of I/O ports
CATEGORY.KEY descriptions of divider-line category letters
COMBINE.BAT combine the pieces of the list into a single file
The following files should be distributed in an archive called INTER47E:
86BUGSnn.ZIP programs to test for CPU bugs
INT.* invoke interrupts from commandline
INT2GUID.* convert list into TurboPower GUIDE or POPHELP database
INT2HLP.ZIP convert list into QuickHelp database
INT2QH.* program to convert list into QuickHelp database
INTHLP??.ZIP Interrupt Helper viewer for the interrupt list
INTHELP.* convert list into TurboPower GUIDE database
INTLIST.E Epsilon extension for handling list
INTPRINT.C source code for INTPRINT
RB2NG???.ZIP convert list into Norton Guides database
INTERVUE.EXE indexed interrupt list browser
INTLIST.ICO Windows icon for INTERVUE
IV.BAT wrapper for INTERVUE
Finally, the following should be distributed in an archive called INTER47F:
INT2WHLP.ZIP convert list into Windows Help database
HINTSRCH.ZIP WinHelp DLL for full-text searches of interrupt list
WH_ED*.ZIP WinHelp-file editor
--------!---CONTACT_INFO---------------------
If you notice any mistakes or omissions, please let me know! It is only with
YOUR help that the list can continue to grow at the current rate. Please send
all changes to me rather than distributing a modified version of the list.

Please read the file INTERRUP.1ST before asking me any questions. You may find
that they have already been addressed.

Ralf Brown

Internet: [email protected]
UUCP: {uunet,harvard}!telerama.lm.com!ralf
FIDO: Ralf Brown 1:129/26.1
or post a message to me in the DR_DEBUG echo (I probably won't see it
unless you address it to me)
CIS: >INTERNET:[email protected]

I reply to all e-mail submissions and inquiries, but some of my replies bounce
because of bad return paths. If you don't get a response from me within a
reasonable period of time, send it again with a better return path (starting at
harvard or ucbvax for UUCP, from the Internet for others).
--------!------------------------------------
See INTERRUP.1ST for the key to system abbreviations and a list of the
trademarks mentioned here.
--------!---DISCLAIMER-----------------------
DISCLAIMER: THIS MATERIAL IS PROVIDED "AS IS". I verify the information
contained in this list to the best of my ability, but I cannot be held
responsible for any problems caused by use or misuse of the information,
especially for those functions not officially documented. If it is marked
"internal" or undocumented, you should check it carefully to make sure it
works the same way in your version of the software (and please let me know
whether or not it works the same way). Information marked with "???" is
known to be incomplete or guesswork.
--------!---FLAGS----------------------------
The use of -> instead of = signifies that the indicated register or register
pair contains a pointer to the specified item, rather than the item itself.
One or more letters may follow the interrupt number; they have the following
meanings: U - undocumented function, u - partially documented function,
P - available only in protected mode, R - available only in real or V86 mode,
C - callout or callback (usually hooked rather than called),
O - obsolete (no longer present in current versions)
--------!---CATEGORIES-----------------------
The ninth column of the divider line preceding an entry usually contains a
classification code (the entry has not been classified if that character is
a dash). The codes currently in use are:
A - applications, a - access software (screen readers, etc),
B - BIOS, b - vendor-specific BIOS extensions,
C - CPU-generated, c - caches/spoolers,
D - DOS kernel, d - disk I/O enhancements,
E - DOS extenders, e - electronic mail, F - FAX,
f - file manipulation, G - debuggers/debugging tools, g - games,
H - hardware, h - vendor-specific hardware,
I - IBM workstation/terminal emulators, i - system info/monitoring,
J - Japanese, j - joke programs,
K - keyboard enhancers, k - file/disk compression,
l - shells/command interpreters,
M - mouse/pointing device, m - memory management,
N - network, n - non-traditional input devices,
O - other operating systems,
P - printer enhancements, p - power management,
Q - DESQview/TopView and Quarterdeck programs,
R - remote control/file access, r - runtime support,
S - serial I/O, s - sound/speech,
T - DOS-based task switchers/multitaskers, t - TSR libraries
U - resident utilities, u - emulators,
V - video, v - virus/antivirus,
W - MS Windows, X - expansion bus BIOSes,
y - security, * - reserved (and not otherwise classified)
--------C-00---------------------------------
INT 00 C - CPU-generated - DIVIDE ERROR
Desc: generated if the divisor of a DIV or IDIV instruction is zero or the
quotient overflows the result register; DX and AX will be unchanged.
Notes: on an 8086/8088, the return address points to the following instruction
on an 80286+, the return address points to the divide instruction
an 8086/8088 will generate this interrupt if the result of a division
is 80h (byte) or 8000h (word)
SeeAlso: INT 04
--------G-00---------------------------------
INT 00 - Zenith - ROM DEBUGGER
Desc: invokes the ROM Debugger when at the BIOS level; equivalent to
pressing Ctrl-Alt-Ins on booting.
Note: since DOS revectors INT 00, it is necessary to restore this vector to
its original ROM BIOS value in order to invoke the debugger once DOS
loads
SeeAlso: INT 03"Columbia"
--------C-01---------------------------------
INT 01 C - CPU-generated - SINGLE STEP
Desc: generated after each instruction if TF (trap flag) is set; TF is
cleared on invoking the single-step interrupt handler
Notes: interrupts are prioritized such that external interrupts are invoked
after the INT 01 pushes CS:IP/FLAGS and clears TF, but before the
first instruction of the handler executes
used by debuggers for single-instruction execution tracing, such as
MS-DOS DEBUG's T command
SeeAlso: INT 03
--------C-01---------------------------------
INT 01 C - CPU-generated (80386+) - DEBUGGING EXCEPTIONS
Desc: generated by the CPU on various occurrences which may be of interest
to a debugger program
Note: events which may trigger the interrupt:
Instruction address breakpoint fault - will return to execute inst
Data address breakpoint trap - will return to following instruction
General detect fault, debug registers in use
Task-switch breakpoint trap
undocumented 386/486 opcode F1h - will return to following instruc
SeeAlso: INT 03
--------H-02---------------------------------
INT 02 C - external hardware - NON-MASKABLE INTERRUPT
Desc: generated by the CPU when the input to the NMI pin is asserted
Notes: return address points to start of interrupted instruction on 80286+
on the 80286+, further NMIs are disabled until the next IRET
instruction, but one additional NMI is remembered by the hardware
and will be serviced after the IRET instruction reenables NMIs
maskable interrupts may interrupt the NMI handler if interrupts are
enabled
although the Intel documentation states that this interrupt is
typically used for power-failure procedures, it has many other uses
on IBM-compatible machines:
Memory parity error: all except Jr, CONV, and some machines
without memory parity
Breakout switch on hardware debuggers
Coprocessor interrupt: all except Jr and CONV
Keyboard interrupt: Jr, CONV
I/O channel check: CONV, PS50+
Disk-controller power-on request: CONV
System suspend: CONV
Real-time clock: CONV
System watch-dog timer, time-out interrupt: PS50+
DMA timer time-out interrupt: PS50+
Low battery: HP 95LX
Module pulled: HP 95LX
--------C-03---------------------------------
INT 03 C - CPU-generated - BREAKPOINT
Desc: generated by the one-byte breakpoint instruction (opcode CCh)
Notes: used by debuggers to implement breakpoints, such as MS-DOS DEBUG's G
command
also used by Turbo Pascal versions 1,2,3 when {$U+} specified
return address points to byte following the breakpoint instruction
called by Novell DOS 7 EMM386 after displaying an exception error
message (GPF, illegal opcodes, etc.) and before waiting for user
input
called by QEMM-386 if the user presses 'I' (undocumented) when prompted
after an exception error message
SeeAlso: INT 01
--------G-03---------------------------------
INT 03 - Columbia PCs (desktop,VP portables) - ROM DEBUGGER
Desc: invokes the ROM Debugger if INT 03 has not been revectored; equivalent
to pressing Esc on booting.
SeeAlso: INT 00"Zenith",INT 03"Realia"
--------G-03---------------------------------
INT 03 - Realia COBOL - DEBUGGER SUPPORT
Note: Realia COBOL checks for a signature eight bytes prior to the interrupt
handler when it starts up
BUG: if the offset of the INT 03 vector is less than 8, the compiler and
all executables generated by it will crash the system
SeeAlso: INT 03"Columbia"
--------G-03---------------------------------
INT 03 U - Watcom WVIDEO, Watcom WD - OUTPUT DEBUGGING MESSAGE
STACK: DWORD selector
DWORD offset of ASCIZ message to display
Notes: the INT 03h instruction which invokes the debugger must be followed by
a JMP SHORT and the signature string "WVIDEO"
to check whether this interface is available, define a public byte
variable named ___WD_Present, which the debugger will set to 01h
before running the program
SeeAlso: AX=0910h
--------U-03---------------------------------
INT 03 - DTown Utilities - POP UP
Program: DTown Software Development's DTown Utilities contains various tools
which are useful to programmers, such as a memory viewer and
disassembler
Note: DTU pops up on INT 03 (if not hooked by a debugger) to allow the
user to inspect memory or code when the machine crashes; various
memory managers will invoke INT 03 when displaying a CPU exception
error message (either automatically or when the user presses a
particular key)
--------G-030910-----------------------------
INT 03 - Soft-ICE - BACK DOOR COMMANDS - DISPLAY STRING IN Soft-ICE WINDOW
AX = 0910h
SI = magic value 4647h ('FG')
DI = magic value 4A4Dh ('JM')
DS:DX -> ASCIZ string to display (max 100 bytes, 0Dh OK)
Program: Soft-ICE is a debugger by Nu-Mega Technologies, Inc.
SeeAlso: INT 03"WVIDEO"
--------G-030911-----------------------------
INT 03 - Soft-ICE - BACK DOOR COMMANDS - EXECUTE Soft-ICE COMMAND
AX = 0911h
SI = magic value 4647h ('FG')
DI = magic value 4A4Dh ('JM')
DS:DX -> ASCIZ command string (max 100 bytes, 0Dh OK)
--------G-030912-----------------------------
INT 03 - Soft-ICE - BACK DOOR COMMANDS - GET BREAKPOINT INFORMATION
AX = 0912h
SI = magic value 4647h ('FG')
DI = magic value 4A4Dh ('JM')
Return: BH = entry number of last breakpoint set
BL = type of last breakpoint set (see #0001)
DH = entry number of last breakpoint to be triggered
DL = type of last triggered breakpoint (see #0001)
Program: Soft-ICE is a debugger by Nu-Mega Technologies, Inc.
SeeAlso: AX=0913h,AX=0914h

(Table 0001)
Values for Soft-ICE breakpoint type:
00h BPM (breakpoint register types)
01h I/O
02h INTerrupt
03h BPX (INT 03h-style breakpoint)
04h reserved
05h range
--------G-030913-----------------------------
INT 03 - Soft-ICE v2.5x - BACK DOOR COMMANDS - SET Soft-ICE BREAKPOINT
AX = 0913h
SI = magic value 4647h ('FG')
DI = magic value 4A4Dh ('JM')
DS:DX -> breakpoint structure (see #0002)
Return: AX = status
00h successful
BX = breakpoint number
03h breakpoint table full
06h memory limit error
07h I/O limit error
09h range limit error
16h duplicate breakpoint
SeeAlso: AX=0912h,AX=0914h

Format of Soft-ICE breakpoint structure:
Offset Size Description (Table 0002)
00h BYTE breakpoint type (see #0003)
01h DWORD breakpoint address 1
(lower range limit for memory BPs,
interrupt number for interrupt BPs,
address of BP for execution BPs,
I/O address (only word) for I/O BPs)
05h DWORD breakpoint address 2
(upper range limit for memory BPs,
optional value to check for for interrupt BPs,
overlay number (0 = root) for execution BPs)
09h DWORD breakpoint address 3
0Dh BYTE breakpoint mode 1 (see #0004)
(for interrupt BPs = register to check
00h no value checking
01h check AL
02h check AH
03h check AX)
0Eh BYTE breakpoint mode 2 (see #0004)
0Fh BYTE breakpoint size (00h byte, 01h word, 03h dword)
10h BYTE breakpoint pass count before program stop
11h BYTE breakpoint state
Note: all unused fields should contain zeros

(Table 0003)
Values for Soft-ICE breakpoint type:
00h memory location
01h memory range
03h I/O
04h interrupt
05h execution break

(Table 0004)
Values for Soft-ICE breakpoint mode:
01h read
02h write
04h execution
--------G-030914-----------------------------
INT 03 - Soft-ICE v2.5x - BACK DOOR COMMANDS - REMOVE Soft-ICE BREAKPOINT
AX = 0914h
SI = magic value 4647h ('FG')
DI = magic value 4A4Dh ('JM')
BX = breakpoint number (returned by AX=0913h)
Return: BX = ???
Program: Soft-ICE is a debugger by Nu-Mega Technologies, Inc.
SeeAlso: AX=0912h,AX=0913h
--------C-04---------------------------------
INT 04 C - CPU-generated - INTO DETECTED OVERFLOW
Desc: the INTO instruction will generate this interrupt if OF (Overflow Flag)
is set; otherwise, INTO is effectively a NOP
Note: may be used for convenient overflow testing (to prevent errors from
propagating) instead of JO or a JNO/JMP combination
SeeAlso: INT 00
--------B-05---------------------------------
INT 05 - PRINT SCREEN
Desc: dump the current text screen to the first printer
Notes: normally invoked by the INT 09 handler when PrtSc key is pressed, but
may be invoked directly by applications
byte at 0050h:0000h contains status used by default handler
00h not active
01h PrtSc in progress
FFh last PrtSc encountered error
default handler is at F000h:FF54h in IBM PC and 100%-compatible BIOSes
BUG: some old BIOSes/applications appear to destroy BP on return
SeeAlso: INT 10/AH=12h/BL=20h,INT 5E"TI Professional",INT 80"Phar Lap"
--------C-05---------------------------------
INT 05 C - CPU-generated (80186+) - BOUND RANGE EXCEEDED
Desc: generated by BOUND instruction when the value to be tested is less than
the indicated lower bound or greater than the indicated upper bound.
Note: returning from this interrupt re-executes the failing BOUND instruction
--------P-05454A-----------------------------
INT 05 U - PSPS v2.01 - EJECT PAGE
AX = 454Ah ('EJ')
Program: PSPS is shareware PostScript PrintScreen utility by A.N.D.
Technologies
Note: sends a ^D to the current printer
SeeAlso: AX=4E57h,AX=5053h,AX=554Eh
--------P-054E57-----------------------------
INT 05 U - PSPS v2.01 - SET PARAMETERS
AX = 4E57h ('NW')
ES:SI -> 11-byte buffer containing new settings
Return: buffer filled
SeeAlso: AX=454Ah,AX=5053h,INT 17/AH=63h
--------P-055053-----------------------------
INT 05 U - PSPS v2.01 - GET PARAMETERS
AX = 5053h ('PS')
ES:SI -> 11-byte buffer for settings
Return: buffer filled
SeeAlso: AX=4E57h,AX=554Eh,INT 17/AH=64h
--------P-05554E-----------------------------
INT 05 U - PSPS v2.01 - UNINSTALL
AX = 554Eh ('UN')
Program: PSPS is shareware PostScript PrintScreen utility by A.N.D.
Technologies
SeeAlso: AX=454Ah,AX=4E57h,INT 17/AH=62h
--------C-06---------------------------------
INT 06 C - CPU-generated (80286+) - INVALID OPCODE
Desc: this interrupt is generated when the CPU attempts to execute an
invalid opcode (most protected-mode instructions are considered
invalid in real mode) or a BOUND, LDS, LES, or LIDT instruction
which specifies a register rather than a memory address
Notes: return address points to beginning of invalid instruction
with proper programming, this interrupt may be used to emulate
instructions which do not exist; many 386 BIOSes emulate the 80286
undocumented LOADALL instruction which was removed from the 80386+
generated by the 80386+ when the LOCK prefix is used with instructions
other than BTS, BTR, BTC, XCHG, XADD (486), CMPXCHG (486), INC, DEC,
NOT, NEG, ADD, ADC, SUB, SBB, AND, OR, or XOR, or any instruction
not accessing memory.
SeeAlso: INT 0C"CPU",INT 0D"CPU"
--------b-06---------------------------------
INT 06 C - HP 95LX - SLEEP/WAKEUP
Desc: this interrupt is called just before going into light or deep
(shutdown) sleep and just after returning from light or deep sleep
SeeAlso: INT 0B"HP 95LX",INT 15/AX=4DD4h,INT 15/AH=4Eh
--------V-06---------------------------------
INT 06 U - no-name clone - GRAPHICS CHARACTER TABLE (NOT A VECTOR!)
Desc: points at graphics data for characters 00h-7Fh of the current font
SeeAlso: INT 43"EGA",INT 44"VIDEO"
--------C-07---------------------------------
INT 07 C - CPU-generated (80286+) - PROCESSOR EXTENSION NOT AVAILABLE
Desc: this interrupt is automatically called if a coprocessor instruction is
encountered when no coprocessor is installed
Note: can be used to emulate a numeric coprocessor in software
SeeAlso: INT 09"MATH UNIT PROTECTION"
--------H-08---------------------------------
INT 08 C - IRQ0 - SYSTEM TIMER
Desc: generated 18.2 times per second by channel 0 of the 8254 system timer,
this interrupt is used to keep the time-of-day clock updated
Notes: programs which need to be invoked regularly should use INT 1C unless
they need to reprogram the timer while still keeping the time-of-day
clock running at the proper rate
default handler is at F000h:FEA5h in IBM PC and 100%-compatible BIOSes
may be masked by setting bit 0 on I/O port 21h
SeeAlso: INT 1C,INT 4A,INT 50"DESQview",INT 58"DoubleDOS",INT 70,INT 78"GO32"
SeeAlso: INT D8"Screen Thief"
--------C-08---------------------------------
INT 08 C - CPU-generated (80286+) - DOUBLE EXCEPTION DETECTED
Desc: called when multiple exceptions occur on one instruction, or an
exception occurs in an exception handler
Notes: called in protected mode if an interrupt above the defined limit of
the interrupt vector table occurs
return address points at beginning of instruction with errors or the
beginning of the instruction which was about to execute when the
external interrupt caused the exception
if an exception occurs in the double fault handler, the CPU goes into
SHUTDOWN mode (which circuitry in the PC/AT converts to a reset);
this "triple fault" is a faster way of returning to real mode on
many 80286 machines than the standard keyboard controller reset
--------H-09---------------------------------
INT 09 C - IRQ1 - KEYBOARD DATA READY
Desc: this interrupt is generated when data is received from the keyboard.
This is normally a scan code (from either a keypress *or* a key
release), but may also be an ACK or NAK of a command on AT-class
keyboards.
Notes: this IRQ may be masked by setting bit 1 on I/O port 21h
if the BIOS supports an enhanced (101/102-key) keyboard, it calls
INT 15/AH=4Fh after reading the scan code (see #0005) from the
keyboard and before further processing; all further processing uses
the scan code returned from INT 15/AH=4Fh
the default interrupt handler is at F000h:E987h in 100%-compatible
BIOSes
the interrupt handler performs the following actions for certain
special keystrokes:
Ctrl-Break clear keyboard buffer, place word 0000h in buffer,
invoke INT 1B, and set flag at 0040h:0071h
SysReq invoke INT 15/AH=85h (SysReq is often labeled SysRq)
Ctrl-Numlock place system in a tight wait loop until next INT 09
Ctrl-Alt-Del jump to BIOS startup code (either F000h:FFF0h or the
destination of the jump at that address)
Shift-PrtSc invoke INT 05
Ctrl-Alt-Plus (HP Vectra) enable keyclick
Ctrl-Alt-Plus (many clones) set clock speed to high
Ctrl-Alt-Minus (HP Vectra) reduce keyclick volume
Ctrl-Alt-Minus (many clones) set clock speed to low
Ctrl-Alt-SysReq (HP Vectra) generate hard reset
DRDOS hooks this interrupt to control the cursor shape (underscore/
half block) for overwrite/insert mode
DR Multiuser DOS hooks this interrupt for cursor shape control and to
control whether Ctrl-Alt-Del reboots the current session or the
entire system
SeeAlso: INT 05,INT 0B"HP 95LX",INT 15/AH=4Fh,INT 15/AH=85h,INT 16,INT 1B
SeeAlso: INT 2F/AX=A901h,INT 4A"TI Professional",INT 51"DESQview"
SeeAlso: INT 59"DoubleDOS",INT 79"GO32"

(Table 0005)
Values for keyboard make/break (scan) code:
01h Esc 31h N
02h 1 ! 32h M
03h 2 @ 33h , < 63h F16
04h 3 # 34h . > 64h F17
05h 4 $ 35h / ? 65h F18
06h 5 % 36h Right Shift 66h F19
07h 6 ^ 37h Grey* 67h F20
08h 7 & 38h Alt 68h F21
09h 8 * 39h SpaceBar 69h F22
0Ah 9 ( 3Ah CapsLock 6Ah F23
0Bh 0 ) 3Bh F1 6Bh F24
0Ch - _ 3Ch F2 6Ch --
0Dh = + 3Dh F3 6Dh EraseEOF
0Eh Backspace 3Eh F4
0Fh Tab 3Fh F5 6Fh Copy/Play
10h Q 40h F6
11h W 41h F7
12h E 42h F8 72h CrSel
13h R 43h F9
14h T 44h F10 74h ExSel
15h Y 45h NumLock 75h --
16h U 46h ScrollLock 76h Clear
17h I 47h Home
18h O 48h UpArrow
19h P 49h PgUp
1Ah [ { 4Ah Grey-
1Bh ] } 4Bh LeftArrow
1Ch Enter 4Ch Keypad 5
1Dh Ctrl 4Dh RightArrow
1Eh A 4Eh Grey+
1Fh S 4Fh End
20h D 50h DownArrow
21h F 51h PgDn
22h G 52h Ins
23h H 53h Del
24h J 54h SysReq ---non-key codes---
25h K 00h kbd buffer full
26h L 56h left \| (102-key)
27h ; : 57h F11 AAh self-test complete
28h ' " 58h F12 E0h prefix code
29h ` ~ E1h prefix code
2Ah Left Shift 5Ah PA1 EEh ECHO
2Bh \ | 5Bh F13 (LWin) F0h prefix code (key break)
2Ch Z 5Ch F14 (RWin) FAh ACK
2Dh X 5Dh F15 (Menu) FCh diag failure (MF-kbd)
2Eh C FDh diag failure (AT-kbd)
2Fh V FEh RESEND
30h B FFh kbd error/buffer full
Notes: scan codes 56h-E1h are only available on the extended (101/102-key)
keyboard and Host Connected (122-key) keyboard; scan codes 5Bh-5Dh
are only available on the 122-key keyboard and the Microsoft Natural
Keyboard; scan codes 5Eh-76h are only available on the 122-key
keyboard
in the default configuration, break codes are the make scan codes with
the high bit set; make codes 60h,61h,70h, etc. are not available
because the corresponding break codes conflict with prefix codes
(code 2Ah is available because the self-test result code AAh is only
sent on keyboard initialization). An alternate keyboard
configuration can be enabled on AT and later systems with enhanced
keyboards, in which break codes are the same as make codes, but
prefixed with an F0h scan code
prefix code E0h indicates that the following make/break code is for a
"gray" duplicate to a key which existed on the original PC keyboard;
prefix code E1h indicates that the following make code has no
corresponding break code (currently only the Pause key generates no
break code)
the Microsoft Natural Keyboard sends make codes 5Bh, 5Ch, and 5Dh
(all with an E0h prefix) for the Left Windows, Right Windows, and
Menu keys on the bottom row
the SysReq key is often labeled SysRq
SeeAlso: #0460
--------C-09---------------------------------
INT 09 C - CPU-generated (80286,80386) - PROCESSOR EXTENSION PROTECTION ERROR
Desc: called if the coprocessor attempts to access memory outside a segment
boundary; it may occur at an arbitrary time after the coprocessor
instruction was issued
Notes: until the condition is cleared or the coprocessor is reset, the only
coprocessor instruction which may be used is FNINIT; WAIT or other
coprocessor instructions will cause a deadlock because the
coprocessor is still busy waiting for data
for the 486+, a coprocessor protection error generates an INT 0D
SeeAlso: INT 07"CPU"
--------*-09---------------------------------
INT 09 P - internal hardware - RESERVED BY Intel (80486)
Note: this exception has been moved to INT 0D
SeeAlso: INT 09"MATH",INT 0D
--------H-0A---------------------------------
INT 0A C - IRQ2 - LPT2 (PC), VERTICAL RETRACE INTERRUPT (EGA,VGA)
Notes: the TOPS and PCnet adapters use this interrupt request line by default
DOS 3.2 revectors IRQ2 to a stack-switching routine
on ATs and above, the physical data line for IRQ2 is labeled IRQ9 and
connects to the slave 8259. The BIOS redirects the interrupt for
IRQ9 back here.
under DESQview, only the INT 15h vector and BASIC segment address (the
word at 0000h:0510h) may be assumed to be valid for the handler's
process
many VGA boards do not implement the vertical retrace interrupt,
including the IBM VGA Adapter where the traces are either cut or
removed
SeeAlso: INT 52"DESQview",INT 5A"DoubleDOS",INT 71,INT 7A"GO32"
--------H-0A---------------------------------
INT 0A C - IRQ2 - Tandy 1000-series HARD DISK
Notes: this interrupt may be masked by setting bit 2 on I/O port 21h
the Tandy 1000, 1000A, and 1000HD use IRQ2 for the hard disk; the
1000EX, HX, RLX, RLX-HD, RLX-B, RLX-HD-B use IRQ5 instead; the
1000RL, RL-HD, SL, SL/2, TL, TL/2, and TL/3 are jumper-selectable
for either IRQ2 or IRQ5 (default IRQ5); the 1000SX and TX are
DIP-switch selectable for IRQ2 or IRQ5 (default IRQ2); the RSX and
RSX-HD use IRQ14. Tandy systems which use IRQ2 for the hard disk
interrupt use IRQ5 for vertical retrace.
SeeAlso: INT 52"DESQview",INT 5A"DoubleDOS",INT 71
--------H-0A---------------------------------
INT 0A - IRQ2 - ROLAND MPU MIDI INTERFACE
Note: newer Roland cards and MIDI interfaces by other manufacturers use
a jumper-selectable IRQ, but software and hardware generally defaults
to IRQ2
SeeAlso: INT 52"DESQview",INT 5A"DoubleDOS",INT 71,INT 7A"GO32"
--------C-0A---------------------------------
INT 0A CP - CPU-generated (80286+) - INVALID TASK STATE SEGMENT
Desc: automatically called during a task switch if the new TSS specified by
the task gate is invalid for any of the following reasons:
TSS limit is less than 43 (80286) or 103 (80386/80486)
LDT selector invalid or segment not present
null SS selector, or SS selector outside LDT/GDT limit
stack segment is read-only
stack segment DPL differs from new CPL, or RPL <> CPL
CS selector is outside LDT/GDT limit or not code
non-conforming code segment's DPL differs from CPL
conforming code segment's DPL > CPL
DS/ES selectors outside LDT/GDT limit or not readable segments
Note: the handler must use a task gate in order to have a valid TSS under
which to execute; it must also reset the busy bit in the new TSS
SeeAlso: INT 0B"CPU"
--------H-0B---------------------------------
INT 0B C - IRQ3 - SERIAL COMMUNICATIONS (COM2)
Desc: automatically asserted by the UART when COM2 needs attention, if the
UART has been programmed to generate interrupts
Notes: the TOPS and PCnet adapters use this interrupt request line as an
alternate
on PS/2s, COM2 through COM8 share this interrupt; on many PC's, COM4
shares this interrupt
may be masked by setting bit 3 on I/O port 21h
SeeAlso: INT 0C"COM1",INT 53"DESQview",INT 5B"DoubleDOS",INT 7B"GO32"
--------C-0B---------------------------------
INT 0B CP - CPU-generated (80286+) - SEGMENT NOT PRESENT
Desc: generated when loading a segment register if the segment descriptor
indicates that the segment is not currently in memory, unless the
segment is an LDT (see INT 0A"CPU") or stack segment (see
INT 0C"CPU") needed by a task switch
Note: may be used to implement virtual memory by loading in segments as they
are accessed, clearing the "not present" bit after loading
SeeAlso: INT 0A"CPU",INT 0E"hardware"
--------h-0B---------------------------------
INT 0B - HP 95LX - LOW-LEVEL KEYBOARD HANDLER
Desc: this is the lowest-level keyboard handler on an HP 95LX palmtop
Note: debounces key, places the keycode in I/O register 60h, and calls INT 09
SeeAlso: INT 09,INT 0D"HP 95LX",INT 15/AX=4DD4h
--------H-0C---------------------------------
INT 0C C - IRQ4 - SERIAL COMMUNICATIONS (COM1)
Desc: automatically asserted by the UART when COM1 needs attention, if the
UART has been programmed to generate interrupts
BUG: this vector is modified but not restored by Direct Access v4.0, and
may be left dangling by other programs written with the same version
of compiled BASIC
Notes: on many PC's, COM3 shares this interrupt
may be masked by setting bit 4 on I/O port 21h
SeeAlso: INT 0B"COM2",INT 54"DESQview",INT 5C"DoubleDOS",INT 7C"GO32"
--------C-0C---------------------------------
INT 0C C - CPU-generated (80286+) - STACK FAULT
Desc: this interrupt is generated in protected mode on a stack overflow or
underflow, or if an inter-level transition or task switch references
a stack segment marked "not present"; it is generated in real mode
on accessing a word operand at SS:FFFFh
Note: the 80286 will shut down in real mode if SP=1 before a push. On the
PC AT and compatibles, external circuitry generates a reset on
shutdown.
SeeAlso: INT 0B"CPU",INT 0D"CPU"
--------I-0C---------------------------------
INT 0C - IBM SYSTEM 36/38 WORKSTATION EMULATION - API POINTER
Desc: the IBM System 36/38 emulator may be invoked through a private API,
whose entry point address (see #0006) is offset 100h in the segment
pointed at by this vector

(Table 0006)
Call the System 36/38 emulator API entry point with:
AH = function
03h update screen
05h select next session
AL = session number (00h-03h)
Return: AL = session type code
00h not active
01h display session
02h printer session
FEh invalid session number
DS = requested session's data segment (0 if not active)
(see #0007)
Return: ???

Format of System 36/38 emulator's data area:
Offset Size Description (Table 0007)
13Eh BYTE bit flags for status line indicators turned on since this byte
last zerod
13Fh BYTE bit flags for status line indicators turned off since this
byte last set to FFh
140h WORD offset of EBCDIC to ASCII translation
146h WORD offset of EBCDIC screen buffer
148h WORD offset of EC (engineering change) level signature
150h BYTE "KEYI"
151h BYTE 5250 key scan code to be sent to remote
15Bh BYTE "SYSAV"
15Dh BYTE 5250 cursor column
15Eh BYTE 5250 cursor row
167h BYTE "DVCTAD"
178h BYTE "FLAGS"
184h BYTE "SESSNOAD"
193h BYTE "STNAD"
198h BYTE "NSDS"
Note: offsets are from the interrupt handler's segment
--------H-0D---------------------------------
INT 0D C - IRQ5 - FIXED DISK (PC,XT), LPT2 (AT), reserved (PS/2)
Notes: under DESQview, only the INT 15h vector and BASIC segment address (the
word at 0000h:0510h) may be assumed to be valid for the handler's
process
the Tandy 1000, 1000A, and 1000HD use IRQ2 for the hard disk; the
1000EX, HX, RLX, RLX-HD, RLX-B, RLX-HD-B use IRQ5 instead; the
1000RL, RL-HD, SL, SL/2, TL, TL/2, and TL/3 are jumper-selectable
for either IRQ2 or IRQ5 (default IRQ5); the 1000SX and TX are
DIP-switch selectable for IRQ2 or IRQ5 (default IRQ2); the RSX and
RSX-HD use IRQ14. Tandy systems which use IRQ2 for the hard disk
interrupt use IRQ5 for vertical retrace.
may be masked by setting bit 5 on I/O port 21h
SeeAlso: INT 0E"IRQ6",INT 0F"IRQ7",INT 55"DESQview",INT 5D"DoubleDOS"
SeeAlso: INT 7D"GO32"
--------H-0D---------------------------------
INT 0D C - IRQ5 - Tandy 1000 60 Hz RAM REFRESH
Desc: used to ensure that the dynamic RAM retains its contents in earlier
1000-series models; later models use normal DMA for RAM refresh
(some early models have no DMA unless it is added via an expansion
card)
SeeAlso: INT 55
--------h-0D---------------------------------
INT 0D - HP 95LX - INFRARED INTERRUPT
Desc: this interrupt is used to perform communications over the infrared
data link
SeeAlso: INT 0B"HP 95LX",INT 0E"HP 95LX",INT 15/AX=4DD4h
--------C-0D---------------------------------
INT 0D C - CPU-generated (80286+) - GENERAL PROTECTION VIOLATION
Desc: the CPU generates this interrupt when it detects a protection violation
which does not fit under any other category having a separate
interrupt
Notes: called in real mode when
an instruction accesses a memory operand extending beyond offset
FFFFh (i.e. WORD at FFFFh or DWORD at FFFDh or higher) in segment
CS, DS, ES, FG, or GS
a PUSH MEM or POP MEM instruction contains an invalid bit encoding
in the second byte
an instruction exceeds the maximum length allowed (10 bytes for
80286, 15 bytes for 80386/80486)
an instruction wraps from offset FFFFh to offset 0000h
called in protected mode on protection violations not covered by INT 06
through INT 0C, including
segment limit violations
write to read-only segments
accesses using null DS or ES selectors
accesses to segments with privilege greater than CPL
wrong descriptor type
called on 80486 protected-mode floating-point protection fault
SeeAlso: INT 09"80486",INT 0C"STACK"
--------H-0E---------------------------------
INT 0E C - IRQ6 - DISKETTE CONTROLLER
Desc: this interrupt is generated by the floppy disk controller on
completion of an operation
Notes: default handler is at F000h:EF57h in IBM PC and 100%-compatible BIOSes
may be masked by setting bit 6 on I/O port 21h
SeeAlso: INT 0D"IRQ5",INT 56"DESQview",INT 5E"DoubleDOS",INT 7E"GO32"
--------C-0E---------------------------------
INT 0E C - CPU-generated (80386+ native mode) - PAGE FAULT
Desc: this interrupt is generated in protected and virtual-86 modes on
attempting to access a 4K memory page whose page table entry has
the "present" bit cleared
Note: used to implement virtual memory
SeeAlso: INT 0B"hardware"
--------h-0E---------------------------------
INT 0E C - HP 95LX - EXTERNAL CARD INTERRUPT
SeeAlso: INT 0D"HP 95LX",INT 0F"HP 95LX",INT 15/AX=4DD4h
--------H-0F---------------------------------
INT 0F C - IRQ7 - PARALLEL PRINTER
Desc: this interrupt is generated by the LPT1 printer adapter when the
printer becomes ready
Notes: most printer adapters do not reliably generate this interrupt
the 8259 interrupt controller generates an interrupt corresponding to
IRQ7 when an error condition occurs
SeeAlso: INT 0D"LPT2",INT 57"DESQview",INT 5F"DoubleDOS",INT 7F"GO32"
--------h-0F---------------------------------
INT 0F C - HP 95LX - REAL-TIME CLOCK
SeeAlso: INT 0E"HP 95LX",INT 15/AX=4DD4h,INT 70
--------C-10---------------------------------
INT 10 C - CPU-generated (80286+) - COPROCESSOR ERROR
Desc: this interrupt is generated by the CPU when the -ERROR pin is asserted

by the coprocessor
Note: AT's and clones usually wire the coprocessor to use IRQ13, but not all
get it right
SeeAlso: INT 09"hardware",INT 75
--------V-1000-------------------------------
INT 10 - VIDEO - SET VIDEO MODE
AH = 00h
AL = desired video mode (see #0009)
Return: AL = video mode flag (Phoenix, AMI BIOS)
20h mode > 7
30h modes 0-5 and 7
3Fh mode 6
AL = CRT controller mode byte (Phoenix 386 BIOS v1.10)
Desc: specify the display mode for the currently active display adapter
Notes: IBM standard modes do not clear the screen if the high bit of AL is set
(EGA or higher only)
the Tseng ET4000 chipset is used by the Orchid Prodesigner II, Diamond
SpeedSTAR VGA, Groundhog Graphics Shadow VGA, Boca Super X VGA,
Everex EV-673
the installation check for Ahead adapters is the signature "AHEAD" at
C000h:0025h
the installation check for Paradise adapters is the signature "VGA=" at
C000h:007Dh
the installation check for Oak Tech OTI-037/057/067/077 chipsets is the
signature "OAK VGA" at C000h:0008h
the installation check for ATI adapters is the signature "761295520" at
C000h:0031h; the byte at C000h:0043h indicates the chipset revision:
31h for 18800
32h for 18800-1
33h for 18800-2
34h for 18800-4
35h for 18800-5
the two bytes at C000h:0040h indicate the adapter type
"22" EGA Wonder
"31" VGA Wonder
"32" EGA Wonder800+
the byte at C000h:0042h contains feature flags
bit 1: mouse port present
bit 4: programmable video clock
the byte at C000h:0044h contains additional feature flags if chipset
byte > 30h (see #0008)
the installation check for Genoa video adapters is the signature
77h XXh 99h 66h at C000h:NNNNh, where NNNNh is stored at C000h:0037h
and XXh is
00h for Genoa 6200/6300
11h for Genoa 6400/6600
22h for Genoa 6100
33h for Genoa 5100/5200
55h for Genoa 5300/5400
for SuperEGA BIOS v2.41+, C000h:0057h contains the product level
for SuperEGA BIOS v3.0+, C000h:0070h contains the signature
"EXTMODE", indicating support for extended modes
SeeAlso: AX=0070h,AX=007Eh,AX=10E0h,AX=10F0h,AH=40h,AX=6F05h,AH=FFh"GO32"
SeeAlso: INT 33/AX=0028h,INT 5F/AH=00h,INT 62/AX=0001h
Index: installation check;Tseng ET4000|installation check;Ahead video cards
Index: installation check;Oak Technologies|installation check;ATI video cards
Index: installation check;Paradise video|installation check;Genoa video cards

Bitfields for ATI additional feature flags:
Bit(s) Description (Table 0008)
0 70 Hz non-interlaced display
1 Korean (double-byte) characters
2 45 MHz memory clock rather than 40 MHz
3 zero wait states
4 paged ROMs
6 no 8514/A monitor support
7 HiColor DAC

(Table 0009)
Values for video mode:
text/ text pixel pixel colors disply scrn system
grph resol box resolution pages addr
00h = T 40x25 8x8 320x200 16gray 8 B800 CGA,PCjr,Tandy
= T 40x25 8x14 320x350 16gray 8 B800 EGA
= T 40x25 8x16 320x400 16 8 B800 MCGA
= T 40x25 9x16 360x400 16 8 B800 VGA
01h = T 40x25 8x8 320x200 16 8 B800 CGA,PCjr,Tandy
= T 40x25 8x14 320x350 16 8 B800 EGA
= T 40x25 8x16 320x400 16 8 B800 MCGA
= T 40x25 9x16 360x400 16 8 B800 VGA
02h = T 80x25 8x8 640x200 16gray 4 B800 CGA,PCjr,Tandy
= T 80x25 8x14 640x350 16gray 8 B800 EGA
= T 80x25 8x16 640x400 16 8 B800 MCGA
= T 80x25 9x16 720x400 16 8 B800 VGA
03h = T 80x25 8x8 640x200 16 4 B800 CGA,PCjr,Tandy
= T 80x25 8x14 640x350 16/64 8 B800 EGA
= T 80x25 8x16 640x400 16 8 B800 MCGA
= T 80x25 9x16 720x400 16 8 B800 VGA
04h = G 40x25 8x8 320x200 4 . B800 CGA,PCjr,EGA,MCGA,VGA
05h = G 40x25 8x8 320x200 4gray . B800 CGA,PCjr,EGA
= G 40x25 8x8 320x200 4 . B800 MCGA,VGA
06h = G 80x25 8x8 640x200 2 . B800 CGA,PCjr,EGA,MCGA,VGA
= G 80x25 . . mono . B000 HERCULES.COM on HGC [14]
07h = T 80x25 9x14 720x350 mono var B000 MDA,Hercules,EGA
= T 80x25 9x16 720x400 mono . B000 VGA
08h = T 132x25 8x8 1056x200 16 . B800 ATI EGA/VGA Wonder [2]
= T 132x25 8x8 1056x200 mono . B000 ATI EGA/VGA Wonder [2]
= G 20x25 8x8 160x200 16 . . PCjr, Tandy 1000
= G 90x43 8x8 720x348 mono . B000 Hercules + MSHERC.COM
= G 90x45 8x8 720x360 mono . B000 Hercules + HERKULES [11]
= G 90x29 8x12 720x348 mono . . Hercules + HERCBIOS [15]
09h = G 40x25 8x8 320x200 16 . . PCjr, Tandy 1000
= G 90x43 8x8 720x348 mono . . Hercules + HERCBIOS [15]
0Ah = G 80x25 8x8 640x200 4 . . PCjr, Tandy 1000
0Bh = reserved (EGA BIOS internal use)
= G 80x25 8x8 640x200 16 . . Tandy 1000 SL/TL [13]
0Ch = reserved (EGA BIOS internal use)
0Dh = G 40x25 8x8 320x200 16 8 A000 EGA,VGA
0Eh = G 80x25 8x8 640x200 16 4 A000 EGA,VGA
0Fh = G 80x25 8x14 640x350 mono 2 A000 EGA,VGA
10h = G 80x25 8x14 640x350 4 2 A000 64k EGA
= G . . 640x350 16 . A000 256k EGA,VGA
11h = G 80x30 8x16 640x480 mono . A000 VGA,MCGA,ATI EGA,ATI VIP
12h = G 80x30 8x16 640x480 16/256K . A000 VGA,ATI VIP
= G 80x30 8x16 640x480 16/64 . A000 ATI EGA Wonder
= G . . 640x480 16 . . UltraVision+256K EGA
13h = G 40x25 8x8 320x200 256/256K . A000 VGA,MCGA,ATI VIP
14h = T 132x25 Nx16 . 16 . . XGA, IBM Enhanced VGA [3]
= T 132x25 8x16 1056x400 16/256K . . Cirrus CL-GD5420/5422/5426
= G 80x25 8x8 640x200 . . . Lava Chrome II EGA
= G . . 640x400 16 . . Tecmar VGA/AD
15h = G 80x25 8x14 640x350 . . . Lava Chrome II EGA
16h = G 80x25 8x14 640x350 . . . Lava Chrome II EGA
= G . . 800x600 16 . . Tecmar VGA/AD
17h = T 132x25 . . . . . Tecmar VGA/AD
= T 80x43 8x8 640x348 16 4 B800 Tseng ET4000 BIOS [10]
= G 80x34 8x14 640x480 . . . Lava Chrome II EGA
18h = T 80x30 9x16 720x480 16 1 A000 Realtek RTVGA [12]
= T 132x25 . . mono . B000 Cirrus 5320 chipset
= T 132x44 8x8 1056x352 mono . B000 Tseng Labs EVA
= T 132x44 9x8 1188x352 4gray 2 B000 Tseng ET3000 chipset
= T 132x44 8x8 1056x352 16/256 2 B000 Tseng ET4000 chipset
= G 80x34 8x14 640x480 . . . Lava Chrome II EGA
= G 1024x768 16 . . Tecmar VGA/AD
19h = T 80x43 9x11 720x473 16 1 A000 Realtek RTVGA [12]
= T 132x25 8x14 1056x350 mono . B000 Tseng Labs EVA
= T 132x25 9x14 1188x350 4gray 4 B000 Tseng ET3000 chipset
= T 132x25 8x14 1056x350 16/256 4 B000 Tseng ET4000 chipset
= T 132x34 . . mono . B000 Cirrus 5320 chipset
1Ah = T 80x60 9x8 720x480 16 1 A000 Realtek RTVGA [12]
= T 132x28 8x13 1056x364 mono . B000 Tseng Labs EVA
= T 132x28 9x13 1188x364 4gray 4 B000 Tseng ET3000 chipset
= T 132x28 8x13 1056x364 16/256 4 B000 Tseng ET4000 chipset
= T 132x44 . . mono . B000 Cirrus 5320 chipset
= G . . 640x350 256 . . Tecmar VGA/AD
1Bh = T 132x25 9x14 1188x350 16 1 A000 Realtek RTVGA [12]
= G . . 640x400 256 . . Tecmar VGA/AD
1Ch = T 132x25 . . . . . Cirrus 5320 chipset
= T 132x30 9x16 1188x480 16 1 A000 Realtek RTVGA [12]
= G . . 640x480 256 . . Tecmar VGA/AD
1Dh = T 132x43 . . . . . Cirrus 5320 chipset
= T 132x43 9x11 1188x473 16 1 A000 Realtek RTVGA [12]
= G . . 800x600 256 . . Tecmar VGA/AD
1Eh = T 132x44 . . . . . Cirrus 5320 chipset
= T 132x60 9x8 1188x480 16 1 A000 Realtek RTVGA [12]
1Fh = G 100x75 8x8 800x600 16 1 A000 Realtek RTVGA
20h = T 132x25 . . 16 . . Avance Logic AL2101
= G 40x16 . 240x128 mono . B000 HP 95LX/100LX/200LX
= G 120x45 8x16 960x720 16 1 A000 Realtek RTVGA
21h = T 80x25 . . mono . B000 HP 200LX
= T 132x30 . . 16 . . Avance Logic AL2101
= T 132x44 9x9 1188x396 16/256K . B800 WD90C
= T 132x44 9x9 1188x396 16 . B800 Diamond Speedstar 24X
= T 132x60 . . 16 2 B800 Tseng ET4000 chipset [10]
= G 80x43 8x8 720x348 mono . B000 DESQview 2.x+Hercules [4]
= G 128x48 8x16 1024x768 16 1 A000 Realtek RTVGA [12]
22h = T 132x43 . . . . . Allstar Peacock (VGA)
= T 132x43 . . 16 . . Avance Logic AL2101
= T 132x44 8x8 1056x352 . . B800 Tseng Labs EVA
= T 132x44 9x8 1188x352 16/256K 2 B800 Tseng ET3000 chipset
= T 132x44 8x8 1056x352 16/256K 2 B800 Tseng ET4000 chipset
= T 132x44 8x8 1056x352 . . . Ahead Systems EGA2001
= T 132x44 8x8 1056x352 16 2 B800 Ahead B
= T 132x44 8x9 1056x398 16 . . STB Lightspeed ET4000/W32P
= T 132x44 . . 16 . . Orchid Prodesigner VGA
= G 80x43 8x8 720x348 mono . B800 DESQview 2.x+Hercules [4]
= G 96x64 8x16 768x1024 16 1 A000 Realtek RTVGA
23h = T 132x25 6x14 792x350 . . B800 Tseng Labs EVA
= T 132x25 9x14 1188x350 16/256K 4 B800 Tseng ET3000 chipset
= T 132x25 8x14 1056x350 16/256 4 B800 Tseng ET4000 chipset
= T 132x25 8x14 1056x350 . . . Ahead Systems EGA2001
= T 132x25 8x14 1056x350 16 4 B800 Ahead B
= T 132x25 8x8 1056x200 16 . B800 ATI EGA Wonder,ATI VIP
= T 132x25 . . . . . Cirrus 5320 chipset
= T 132x28 . . . . . Allstar Peacock (VGA)
= T 132x28 . . 16 . . Orchid Prodesigner VGA
= T 132x60 . . 16 . . Avance Logic AL2101
= G 128x48 8x16 1024x768 4 1 A000 Realtek RTVGA
24h = T 80x30 . . 16 . . Avance Logic AL2101
= T 132x25 . . . . . Allstar Peacock (VGA)
= T 132x25 . . 16 . . Orchid Prodesigner VGA
= T 132x28 6x13 792x364 . . B800 Tseng Labs EVA
= T 132x28 9x13 1188x364 16/256K 4 B800 Tseng ET3000 chipset
= T 132x28 8x12 1056x336 16 1 B800 Ahead B
= T 132x28 8x13 1056x364 16/256K 4 B800 Tseng ET4000 chipset
= T 132x28 8x14 1056x392 16 . . STB Lightspeed ET4000/W32P
= T 132x28 . . . . . Cirrus 5320 chipset
= G 64x32 8x16 512x512 256 1 A000 Realtek RTVGA
25h = T 80x43 . . 16 . . Avance Logic AL2101
= G 80x60 8x8 640x480 . . A000 Tseng Labs EVA
= G 80x60 8x8 640x480 16/256K 1 A000 Tseng ET3000/4000 chipset
= G . . 640x480 16 . . VEGA VGA
= G 80x60 8x8 640x480 16 . A000 Orchid Prodesigner VGA
= G 80x60 8x8 640x480 16 1 A000 Ahead B (same as 26h)
= G . . 640x480 16 . . NEC GB-1
= G . . 640x480 16 . . Cirrus 5320 chipset
= G . . 640x400 256 . . Realtek RTVGA
26h = T 80x60 8x8 640x480 . . . Tseng Labs EVA
= T 80x60 8x8 640x480 16/256K 3 B800 Tseng ET3000/4000 chipset
= T 80x60 . . . . . Allstar Peacock (VGA)
= T 80x60 . . 16 . . Orchid ProDesigner VGA
= T 80x60 . . 16 . . Avance Logic AL2101
= G 80x60 8x8 640x480 . . . Ahead Systems EGA2001
= G 80x60 8x8 640x480 16 1 A000 Ahead B (same as 25h)
= G . . 640x480 256 . . Realtek RTVGA
27h = T 132x25 8x8 1056x200 mono . B000 ATI EGA Wonder,ATI VIP
= G . . 720x512 16 . . VEGA VGA
= G . . 720x512 16 . . Genoa
= G 100x75 8x8 800x600 256 1 A000 Realtek RTVGA [12]
= G . . 960x720 16 . . Avance Logic AL2101
28h = T ???x??? . . . . . VEGA VGA
= G . . 512x512 256 . . Avance Logic AL2101
= G . . 1024x768 256 . . Realtek RTVGA (1meg)
29h = G . . 640x400 256 . . Avance Logic AL2101
= G . . 800x600 16 . . VEGA VGA
= G 100x37 8x16 800x600 16 . A000 Orchid
= G . . 800x600 16 . A000 STB,Genoa,Sigma
= G . . 800x600 16 . . Allstar Peacock (VGA)
= G 100x37 8x16 800x600 16/256K 1 A000 Tseng ET3000/4000 chipset
= G . . 800x600 ??? . . EIZO MDB10
= G . . 800x600 16 . . Cirrus 5320 chipset
= G NA . 800x600 16 . . Compaq QVision 1024/1280
= G . . 1024x1024 256 . . Realtek RTVGA BIOS v3.C10
2Ah = T 100x40 . . . . . Allstar Peacock (VGA)
= T 100x40 8x16 800x640 16 . . Orchid Prodesigner VGA
= T 100x40 8x15 800x600 16/256K 4 B800 Tseng ET3000/4000 chipset
= T 100x40 8x15 800x600 16 . . STB Lightspeed ET4000/W32P
= G . . 640x480 256 . . Avance Logic AL2101
= G . . 1280x1024 16 . . Realtek RTVGA
2Bh = G . . 800x600 16 . . Avance Logic AL2101
2Ch = G . . 800x600 256 . . Avance Logic AL2101
2Dh = G . . 640x350 256 . . VEGA VGA
= G . . 640x350 256/256K . A000 Orchid, Genoa, STB
= G 80x25 8x14 640x350 256/256K 1 A000 Tseng ET3000/4000 chipset
= G . . 640x350 256 . . Cirrus 5320 chipset
= G 80x25 8x14 640x350 256 . . STB Lightspeed ET4000/W32P
= G . . 768x1024 16 . . Avance Logic AL2101
2Eh = G . . 640x480 256 . . VEGA VGA
= G 80x30 8x16 640x480 256/256K . A000 Orchid
= G . . 640x480 256/256K . A000 STB,Genoa,Sigma
= G 80x30 8x16 640x480 256/256K 1 A000 Tseng ET3000/4000 chipset
= G . . 640x480 256/256K . . Compaq QVision 1024/1280
= G . . 768x1024 256 . . Avance Logic AL2101
2Fh = T 160x50 8x8 1280x400 16 4 B800 Ahead B (Wizard/3270)
= G . . 720x512 256 . . VEGA VGA
= G . . 720x512 256 . . Genoa
= G 80x25 8x16 640x400 256/256K 1 A000 Tseng ET4000 chipset
= G . . 1024x768 4 . . Avance Logic AL2101
30h = G . . 800x600 256 . . VEGA VGA
= G 100x37 8x16 800x600 256/256K . A000 Orchid
= G . . 800x600 256/256K . A000 STB,Genoa,Sigma
= G . . 720x350 2 . . 3270 PC
= G . . 800x600 256 . . Cardinal
= G . . . . . B800 AT&T 6300
= G 100x37 8x16 800x600 256/256K 1 A000 Tseng ET3000/4000 chipset
= G . . 1024x768 16 . . Avance Logic AL2101
31h = G . . 1024x768 256 . . Avance Logic AL2101
32h = T 80x34 8x10 . 16 4 B800 Ahead B (Wizard/3270)
= G . . 640x480 256 . . Compaq QVision 1024/1280
33h = T 132x44 8x8 . 16 . B800 ATI EGA Wonder,ATI VIP
= T 80x34 8x8 . 16 4 B800 Ahead B (Wizard/3270)
34h = T 80x66 8x8 . 16 4 B800 Ahead B (Wizard/3270)
= G . . 800x600 256 . . Compaq QVision 1024/1280
36h = G . . 960x720 16 . . VEGA VGA, STB
= G . . 960x720 16 . A000 Tseng ET3000 only
= G . . 1280x1024 16 . . Avance Logic AL2101
37h = T 132x44 8x8 . mono . B800 ATI EGA Wonder,ATI VIP
= G . . 1024x768 16 . . VEGA VGA
= G 128x48 8x16 1024x768 16 . A000 Orchid
= G . . 1024x768 16 . A000 STB,Genoa,Sigma
= G . . 1024x768 16 . . Definicon
= G 128x48 8x16 1024x768 16 1 A000 Tseng ET3000/4000 chipset
= G . . 1024x768 16 . . Compaq QVision 1024/1280
= G . . 1280x1024 256 . . Avance Logic AL2101
38h = G . . 1024x768 256 . . STB VGA/EM-16 Plus (1MB)
= G 128x48 8x16 1024x768 256/256K 1 A000 Tseng ET4000 chipset
= G . . 1024x768 256 . . Orchid ProDesigner II
= G . . 1024x768 256 . . Compaq QVision 1024/1280
39h = G . . 1280x1024 16 . . Compaq QVision 1280
3Ah = G . . 1280x1024 256 . . Compaq QVision 1280
3Bh = G . . 512x480 256 . . Compaq QVision 1024/1280
3Ch = G . . 640x400 64K . . Compaq QVision 1024/1280
3Dh = G . . 1280x1024 16 . . Definicon
= G 128x64 8x16 1280x1024 16 1 A000 Tseng ET4000 v3.00 [1,7]
3Eh = G . . 1280x961 16 . . Definicon
= G . . 640x480 64K . . Compaq QVision 1024/1280
3Fh = G . . 1280x1024 256 . . Hercules ??? (ET4000W32)
= G . . 800x600 64K . . Compaq QVision 1024/1280
40h = T 80x43 . . . . . VEGA VGA, Tecmar VGA/AD
= T 80x43 . . . . . Video7 V-RAM VGA
= T 80x43 . . . . . Tatung VGA
= T 100x30 . . 16 . . MORSE VGA
= T 100x30 . . . . . Cirrus 510/520 chipset
= T 80x25 . 720x350 mono . . Genoa SuperEGA BIOS 3.0+
= G . . 320x200 64K . . Avance Logic AL2101
= G 80x25 8x16 640x400 2 1 B800 AT&T 6300, AT&T VDC600
= G 80x25 8x16 640x400 2 1 B800 Olivetti Quaderno
= G 80x25 8x16 640x400 2 1 B800 Compaq Portable
= G . . 1024x768 64K . . Compaq QVision 1280
41h = T 132x25 . . . . . VEGA VGA
= T 132x25 . . . . . Tatung VGA
= T 132x25 . . . . . Video7 V-RAM VGA
= T 100x50 . . 16 . . MORSE VGA
= T 100x50 . . . . . Cirrus 510/520 chipset
= T 80x34 9x14 720x476 16/256K . B800 WD90C
= T 80x34 9x14 . 16 . B800 Diamond Speedstar 24X
= G . . 512x512 64K . . Avance Logic AL2101
= G . . 640x200 16 1 . AT&T 6300
= G 80x25 . 720x348 mono . B000 Genoa SuperEGA BIOS 3.0+
42h = T 132x43 . . . . . VEGA VGA
= T 132x43 . . . . . Tatung VGA
= T 132x43 . . . . . Video7 V-RAM VGA
= T 80x34 9x10 . 4 4 B800 Ahead B (Wizard/3270)
= T 100x60 . . 16 . . MORSE VGA
= T 100x60 . . . . . Cirrus 510/520 chipset
= G 80x25 8x16 640x400 16 . . AT&T 6300, AT&T VDC600
= G . . 640x400 64K . . Avance Logic AL2101
= G 80x25 . 720x348 mono . B800 Genoa SuperEGA BIOS 3.0+
43h = T 80x60 . . . . . VEGA VGA
= T 80x60 . . . . . Tatung VGA
= T 80x60 . . . . . Video7 V-RAM VGA
= T 80x45 9x8 . 4 4 B800 Ahead B (Wizard/3270)
= T 100x75 . . 16 . . MORSE VGA
= T 80x29 . 720x348 mono . . Genoa SuperEGA BIOS 3.0+
= G . . 640x200 of 640x400 viewport AT&T 6300 (unsupported)
= G . . 640x480 64K . . Avance Logic AL2101
44h = disable VDC and DEB output . AT&T 6300
= T 100x60 . . . . . VEGA VGA
= T 100x60 . . . . . Tatung VGA
= T 100x60 . . . . . Video7 V-RAM VGA
= T 80x32 . 720x352 mono . . Genoa SuperEGA BIOS 3.0+
= G . . 800x600 64K . . Avance Logic AL2101
45h = T 132x28 . . . . . Tatung VGA
= T 132x28 . . . . . Video7 V-RAM VGA
= T 80x44 . 720x352 mono . . Genoa SuperEGA BIOS 3.0+
46h = T 132x25 8x14 . mono . . Genoa 6400
= T 132x25 9x14 . mono . . Genoa SuperEGA BIOS 3.0+
= G 100x40 8x15 800x600 2 . . AT&T VDC600
47h = T 132x29 8x12 . mono . . Genoa 6400
= T 132x29 9x12 . mono . . Genoa SuperEGA BIOS 3.0+
= T 132x28 9x16 1188x448 16/256K . B800 WD90C
= T 132x28 9x16 . 16 . B800 Diamond Speedstar 24X
= G 100x37 8x16 800x600 16 . . AT&T VDC600
48h = T 132x32 8x12 . mono . . Genoa 6400
= T 132x32 9x11 . mono . . Genoa SuperEGA BIOS 3.0+
= G 80x50 8x8 640x400 2 . B800 AT&T 6300, AT&T VDC600
= G 80x50 8x8 640x400 2 . B800 Olivetti Quaderno
49h = T 132x44 8x8 . mono . . Genoa 6400
= T 132x44 9x8 . mono . . Genoa SuperEGA BIOS 3.0+
= G 80x30 8x16 640x480 . . . Lava Chrome II EGA
4Dh = T 120x25 . . . . . VEGA VGA
= G . . 512x480 16M . . Compaq QVision 1024/1280
4Eh = T 120x43 . . . . . VEGA VGA
= T 80x60 8x8 . 16/256K . B800 Oak OTI-067/OTI-077 [8]
= G . . 640x400 16M . . Compaq QVision 1024/1280
4Fh = T 132x25 . . . . . VEGA VGA
= T 132x60 . . . . . some Oak Tech VGA [8]
= G . . 640x480 16M . . Compaq QVision 1280
50h = T 80x30 8x16 . 16/256K . B800 Trident TVGA 8800/8900
= T 80x34 . . . . . Lava Chrome II EGA
= T 80x43 . . mono . . VEGA VGA
= T 132x25 9x14 . mono . . Ahead Systems EGA2001
= T 132x25 9x14 . 4 4 B800 Ahead B
= T 132x25 8x14 . 16 8 B800 OAK Technologies VGA-16
= T 132x25 8x14 . 16/256K . B800 Oak OTI-037/067/077 [8]
= T 132x25 8x14 1056x350 16 8 B800 UM587 chipset
= T 132x30 . . 16 . . MORSE VGA
= T 132x30 . . . . . Cirrus 510/520 chipset
= G 80x30 8x16 640x480 16 . . Paradise EGA-480
= G 80x30 8x16 640x480 16 . . NEL Electronics BIOS
= G . . 640x480 mono??? . . Taxan 565 EGA
= G 40x25 8x8 320x200 . . . Genoa SuperEGA BIOS 3.0+
51h = T 80x30 8x16 . . . . Paradise EGA-480
= T 80x30 9x16 . . . . NEL Electronics BIOS
= T 80x30 . . . . . Lava Chrome II EGA
= T 80x43 8x11 . 16/256K . B800 Trident TVGA 8800/8900
= T 132x25 . . mono . . VEGA VGA
= T 132x28 9x12 . 4 4 B800 Ahead B
= T 132x43 8x8 . 16 5 B800 OAK Technologies VGA-16
= T 132x43 8x8 . 16/256K . B800 Oak OTI-037/067/077
= T 132x43 8x8 1056x344 16 5 B800 UM587 chipset
= T 132x50 . . 16 . . MORSE VGA
= T 132x50 . . . . . Cirrus 510/520 chipset
= G 80x34 8x14 640x480 16 . . ATI EGA Wonder
= G 80x25 8x8 640x200 . . . Genoa SuperEGA BIOS 3.0+
52h = T 80x60 . . . . . Lava Chrome II EGA
= T 80x60 8x8 . 16/256K . B800 Trident TVGA 8800/8900
= T 132x43 . . mono . . VEGA VGA
= T 132x44 9x8 . mono . . Ahead Systems EGA2001
= T 132x44 9x8 . 4 2 B800 Ahead B
= T 132x60 . . 16 . . MORSE VGA
= T 132x60 . . . . . Cirrus 510/520 chipset
= G 80x25 8x19 640x480 16 1 A000 AX VGA (Kanji&superimpose)
= G 94x29 8x14 752x410 16 . . ATI EGA Wonder
= G 100x75 8x8 800x600 16 1 A000 OAK Technologies VGA-16
= G 100x75 8x8 800x600 16 . A000 Oak OTI-037 chipset [8]
= G 100x37 8x16 800x600 16 . A000 Oak OTI-067/077 chips [8]
= G 100x75 8x8 800x600 16 . A000 UM587 chipset
= G 128x30 8x16 1024x480 16 . . NEL Electronics BIOS
53h = T 80x25 8x16 . . . . NEL Electronics BIOS
= T 80x60 . . 16 . . MORSE VGA
= T 80x60 . . . . . Cirrus 510/520 chipset
= T 132x25 8x14 . 16/256K . B800 Trident TVGA 8800/8900
= T 132x43 . . . . . Lava Chrome II EGA
= G 80x25 8x19 640x480 16 1 A000 AX VGA (Kanji, no superimp.)
= G . . 640x480 256 . . Oak VGA
= G 80x30 8x16 640x480 256 . A000 Oak OTI-067/OTI-077 [8]
= G 100x40 8x14 800x560 16 . . ATI EGA Wonder,ATI VIP
= G . . . . . . AX PC
54h = T 132x25 . . . . . Lava Chrome II EGA
= T 132x30 8x16 . 16/256K . B800 Trident TVGA 8800/8900
= T 132x43 8x8 . . . . Paradise EGA-480
= T 132x43 8x8 . . . . NEL Electronics BIOS
= T 132x43 7x9 . 16/256K . B800 Paradise VGA
= T 132x43 8x9 . 16/256K . B800 Paradise VGA on multisync
= T 132x43 . . . . . Taxan 565 EGA
= T 132x43 . . . . . AST VGA Plus
= T 132x43 . . . . . Hewlett-Packard D1180A
= T 132x43 7x9 . 16 . . AT&T VDC600
= T 132x43 9x9 1188x387 16/256K . B800 WD90C
= T 132x43 9x9 1188x387 16/256K . B800 Diamond Speedstar 24X
= T 132x43 9x9 1188x387 16/256K . B800 Diamond Stealth 24
= T 132x43 8x8 1056x350 16/256K . . Cirrus CL-GD5420/5422/5426
= T 132x50 8x8 . 16 . A000 NCR 77C22 [9]
= G 100x42 8x14 800x600 16 . A000 ATI EGA Wonder, VGA Wonder
= G 100x42 8x14 800x600 16 . A000 ATI Ultra 8514A, ATI XL
= G . . 800x600 256 . A000 Oak VGA
= G 100x37 8x16 800x600 256 . A000 Oak OTI-067/077 chips [8]
55h = T 80x66 8x8 . 16/256K . A000 ATI VIP
= T 132x25 8x14 . . . . Paradise EGA-480
= T 132x25 8x14 . . . . NEL Electronics BIOS
= T 132x25 7x16 . 16/256K . B800 Paradise VGA
= T 132x25 8x16 . 16/256K . B800 Paradise VGA on multisync
= T 132x25 . . . . . Taxan 565 EGA
= T 132x25 . . . . . AST VGA Plus
= T 132x25 . . . . . Hewlett-Packard D1180A
= T 132x25 7x16 . 16 . . AT&T VDC600
= T 132x25 8x16 . 16 . A000 NCR 77C22 [9]
= T 132x25 9x16 1188x400 16/256K . B800 WD90C
= T 132x25 9x16 1188x400 16/256K . B800 Diamond Speedstar 24X
= T 132x25 9x16 1188x400 16/256K . B800 Diamond Stealth 24
= T 132x25 8x14 1056x350 16/256K . . Cirrus CL-GD5420/5422/5426
= T 132x43 8x11 . 16/256K . B800 Trident TVGA 8800/8900
= G 94x29 8x14 752x410 . . . Lava Chrome II EGA
= G 128x48 8x16 1024x768 16/256K . A000 ATI VGA Wonder v4+ [5]
= G . . 1024x768 16/256K . . ATI VGA Wonder Plus
= G . . 1024x768 16/256K . . ATI Ultra 8514A,ATI XL
= G 128x48 8x16 1024x768 4 . A000 Oak OTI-067/077 chips [8]
56h = T 132x43 8x8 . 3??? 2 B000 NSI Smart EGA+
= T 132x43 7x9 . 4 . B000 Paradise VGA
= T 132x43 8x9 . 4 . B000 Paradise VGA on multisync
= T 132x43 . . mono . . Taxan 565 EGA
= T 132x43 7x9 . 2 . . AT&T VDC600
= T 132x43 9x8 . . . . NEL Electronics BIOS
= T 132x50 8x8 . 4 . A000 NCR 77C22 [9]
= T 132x60 8x8 . 16/256K . B800 Trident TVGA 8800/8900
= G . . 1024x768 16 . A000 Oak VGA
= G 128x48 8x16 1024x768 16 . A000 Oak OTI-067/077 chips [8]
57h = T 132x25 8x14 . 3??? 4 B000 NSI Smart EGA+
= T 132x25 7x16 . 4 . B000 Paradise VGA
= T 132x25 8x16 . 4 . B000 Paradise VGA on multisync
= T 132x25 9x14 . . . . NEL Electronics BIOS
= T 132x25 . . mono . . Taxan 565 EGA
= T 132x25 7x16 . 2 . . AT&T VDC600
= T 132x25 9x14 . 16/256K . B800 Trident TVGA 8800/8900
= T 132x25 8x16 . 4 . A000 NCR 77C22 [9]
= G 96x48 8x16 768x1024 16 . A000 Oak OTI-067/077 chips [8]
58h = T 80x33 8x14 . 16 . B800 ATI EGA Wonder,ATI VIP
= T 80x32 9x16 . 16 . . Genoa 6400
= T 80x43 8x8 . . . . NEL Electronics BIOS
= T 132x30 9x16 . 16/256K . B800 Trident TVGA 8800/8900
= G 100x75 8x8 800x600 16/256K . A000 Paradise VGA
= G 100x75 8x8 800x600 16 . . AT&T VDC600
= G 100x75 8x8 800x600 16 . A000 NCR 77C22 [9]
= G 100x75 8x8 800x600 16 . . Diamond Speedstar 24X
= G 100x75 8x8 800x600 16/256K . A000 Paradise VGA, WD90C
= G . . 800x600 16 . . AST VGA Plus, Compaq VGA
= G . . 800x600 16 . . Dell VGA
= G . . 800x600 16 . . Hewlett-Packard D1180A
= G . . 800x600 ??? . . ELT VGA PLUS 16
= G 100x37 8x16 800x600 16/256K . A000 Cirrus CL-GD5420/5422/5426
= G 160x64 8x16 1280x1024 16 . A000 Oak OTI-077 chipset [8]
59h = T 80x43 9x8 . . . . NEL Electronics BIOS
= T 80x66 8x8 . 16/256K . A000 ATI VIP
= T 132x43 9x11 . 16/256K . B800 Trident TVGA 8800/8900
= G 100x75 8x8 800x600 2 . A000 Paradise VGA
= G 100x75 8x8 800x600 2 . . AT&T VDC600
= G . . 800x600 2 . . AST VGA Plus, Compaq VGA
= G . . 800x600 2 . . Dell VGA
= G . . 800x600 2 . . Hewlett-Packard D1180A
= G 100x75 8x8 800x600 2 . A000 NCR 77C22 [9]
= G 128x48 8x16 1024x768 256 . A000 Oak OTI-077 chipset [8]
5Ah = T 80x60 8x8 . . . . NEL Electronics BIOS
= T 132x60 9x8 . 16/256K . B800 Trident TVGA 8800/8900
= G 128x48 8x16 1024x768 2 . A000 NCR 77C22 [9]
5Bh = T 80x30 8x16 . . . B800 ATI VGA Wonder (undoc)
= G . . 640x350 256 . . Genoa 6400
= G 80x25 8x16 640x400 32K . A000 Oak OTI-067/077 chips [8]
= G . . 800x600 16 . . Maxxon, SEFCO TVGA, Imtec
= G 100x75 8x8 800x600 16/256K . A000 Trident TVGA 8800, 8900
= G . . 800x600 ??? . . Vobis MVGA
= G 100x37 8x16 800x600 . . . NEL Electronics BIOS
= G 128x48 8x16 1024x768 16 . A000 NCR 77C22 [1,9]
5Ch = T 100x37 8x16 . . . . NEL Electronics BIOS
= G . . 640x400 256 . . Logix, ATI Prism Elite
= G . . 640x400 256 . . Maxxon, SEFCO TVGA, Imtec
= G 80x25 8x16 640x400 256/256K . A000 Zymos Poach, Hi Res 512
= G 80x25 8x16 640x400 256/256K . A000 Trident TVGA 8800/8900
= G 80x30 8x16 640x480 256 . . Genoa 6400
= G 80x30 8x16 640x480 32K . A000 Oak OTI-077 chipset [8]
= G 100x75 8x8 800x600 256 . A000 NCR 77C22 [9]
= G 100x75 8x8 800x600 256/256K . A000 WD90C
= G 100x75 8x8 800x600 256/256K . A000 Diamond Speedstar 24X
= G 100x37 8x16 800x600 256/256K . A000 Cirrus CL-GD5420/5422/5426
5Dh = T 100x75 8x8 . . . . NEL Electronics BIOS
= G 80x25 8x14 640x350 64K . . STB Lightspeed ET4000/W32P
= G . . 640x480 256 . . Logix, ATI Prism Elite
= G . . 640x480 256 . . Maxxon, SEFCO TVGA, Imtec
= G 80x30 8x16 640x480 256/256K . A000 Zymos Poach, Hi Res 512
= G 80x30 8x16 640x480 256/256K . A000 Trident TVGA 8800 (512K)
= G 128x48 8x16 1024x768 16 . A000 NCR 77C22 [9]
= G 128x48 8x16 1024x768 16/256K . A000 WD90C
= G 128x48 8x16 1024x768 16 . . Diamond Speedstar 24X
= G 128x48 8x16 1024x768 16/256K . A000 Cirrus CL-GD5420/5422/5426
5Eh = G . . 640x400 256 . . Paradise VGA,VEGA VGA
= G . . 640x400 256 . . AST VGA Plus, NCR 77C22
= G . . 640x400 256 . . Compaq VGA, Dell VGA
= G 80x25 8x16 640x400 256 . . AT&T VDC600
= G 80x25 8x16 640x400 256 . A000 NCR 77C22 [9]
= G 80x25 8x16 640x400 256/256K . A000 WD90C
= G 80x25 8x16 640x400 256/256K . A000 Diamond Speedstar 24X
= G . . 800x600 16 . . Logix, ATI Prism Elite
= G 100x37 8x16 800x600 16 . . NEL Electronics BIOS
= G 100x75 8x8 800x600 256 . . Genoa 6400
= G 100x75 8x8 800x600 256/256K . A000 Zymos Poach, Trident 8900
= G 100x75 8x8 800x600 256/256K . A000 Hi Res 512
5Fh = G 80x25 8x16 640x400 64K . . STB Lightspeed ET4000/W32P
= G . . 640x480 256 . . Paradise VGA
= G . . 640x480 256 . . AST VGA Plus, NCR 77C22
= G . . 640x480 256 . . Compaq VGA, Dell VGA
= G . . 640x480 256 . . Hewlett-Packard D1180A
= G 80x30 8x16 640x480 256 . . AT&T VDC600 (512K)
= G 80x30 8x16 640x480 256 . A000 NCR 77C22 [9]
= G 80x30 8x16 640x480 256/256K . A000 WD90C
= G 80x30 8x16 640x480 256/256K . A000 Diamond Speedstar 24X
= G 80x30 8x16 640x480 256/256K . A000 Cirrus CL-GD5420/5422/5426
= G . . 1024x768 16 . . Logix, ATI Prism Elite
= G . . 1024x768 16 . . Maxxon, Imtec
= G 128x48 8x16 1024x768 16 . . Genoa 6400
= G 128x48 8x16 1024x768 16/256K . A000 Zymos Poach, Hi Res 512
= G 128x48 8x16 1024x768 16/256K . A000 Trident TVGA 88/8900 512K
60h = T 132x25 8x14 . 16/64 8 B800 Quadram Ultra VGA
= T 132x25 8x14 . 16 . . Genoa 6400
= T 132x25 8x14 . 16 . . Genoa SuperEGA BIOS 3.0+
= T 132x25 . . . . . Cirrus 5320 chipset
= T 132x25 . . 16 . . Chips&Technologies chipset
= G 80x??? . ???x400 . . . Corona/Cordata BIOS 4.10+
= G 80x25 8x16 640x400 256 1 A000 Ahead A, Ahead B
= G . . 752x410 . . . VEGA VGA
= G . . 752x410 16 . . Tatung VGA
= G . . 752x410 16 . . Video7 V-RAM VGA
= G 128x48 8x16 1024x768 4/256K . A000 Trident TVGA 8900
= G 128x48 8x16 1024x768 256/256K . A000 WD90C
= G 128x48 8x16 1024x768 256/256K . A000 Diamond Speedstar 24X
= G 128x48 8x16 1024x768 256/256K . A000 Cirrus CL-GD5420/5422/5426
61h = T 132x29 8x12 . 16/64 8 B800 Quadram Ultra VGA
= T 132x29 8x8 . 16 . . Genoa 6400
= T 132x29 8x8 . 16 . . Genoa SuperEGA BIOS 3.0+
= T 132x50 . . . . . Cirrus 5320 chipset
= T 132x50 . . 16 . . Chips&Technologies chipset
= G . . ???x400 . . . Corona/Cordata BIOS 4.10+
= G 80x25 8x16 640x400 256 . A000 ATI VGA Wonder,VGA Wonder+
= G 80x25 8x16 640x400 256 . A000 ATI Ultra 8514A,ATI XL
= G 80x30 8x16 640x480 256 1 A000 Ahead A, Ahead B (512K)
= G . . 720x540 . . . VEGA VGA
= G . . 720x540 16 . . Tatung VGA
= G . . 720x540 16 . . Video7 V-RAM VGA
= G 96x64 8x16 768x1024 16/256K . A000 Trident TVGA 88/8900 512K
= G 128x48 8x16 1024x768 256 . A000 NCR 77C22 [1,9]
62h = T 132x32 8x11 . 16/64 6 B800 Quadram Ultra VGA
= T 132x32 8x12 . 16 . . Genoa 6400
= T 132x32 8x11 . 16 . . Genoa SuperEGA BIOS 3.0+
= G . . 640x450 16 . . Cirrus 510/520 chipset
= G 80x30 8x16 640x480 256 . A000 ATI VGA Wonder,VGA Wonder+
= G 80x30 8x16 640x480 256 . A000 ATI Ultra 8514A,ATI XL
= G 80x30 8x16 640x480 32K . A000 WD90C
= G 80x30 8x16 640x480 32K . A000 Diamond Speedstar 24X
= G . . 800x600 . . . VEGA VGA
= G . . 800x600 16 . . Tatung VGA
= G . . 800x600 16 . . Video7 V-RAM VGA
= G 100x75 8x8 800x600 256 1 A000 Ahead A, Ahead B (512K)
= G 128x48 8x16 1024x768 256/256K . A000 Trident TVGA 8900, Zymos
= G 128x48 8x16 1024x768 256 . A000 NCR 77C22 [9]
63h = T 132x44 8x8 . 16/64 5 B800 Quadram Ultra VGA
= T 132x44 8x8 . 16 . . Genoa 6400
= T 132x44 8x8 . 16 . . Genoa SuperEGA BIOS 3.0+
= G . . 720x540 16 . . MORSE VGA
= G . . 720x540 16 . . Cirrus 510/520 chipset
= G 100x42 8x14 800x600 256 . A000 ATI VGA Wonder,VGA Wonder+
= G 100x42 8x14 800x600 256 . A000 ATI Ultra 8514A,ATI XL
= G . . 800x600 32K . A000 WD90C
= G . . 800x600 32K . A000 Diamond Speedstar 24X
= G 128x48 7x16 1024x768 256 1 A000 Ahead B (1MB)
= G . . 1024x768 2 . . Video7 V-RAM VGA
64h = T 132x60 8x8 . 16 . . Genoa 6400
= G . . 640x480 64K . A000 Cirrus CL-GD 5422/5426
= G . . 800x600 16 . . MORSE VGA
= G . . 800x600 16 . . Cirrus 510/520 chipset
= G . . 800x600 ??? . . SAMPO-Mira VGA
= G . . 1024x768 4 . . Video7 V-RAM VGA
= G 128x48 8x16 1024x768 256 . A000 ATI VGA Wonder Plus,ATI XL
= G 160x64 8x16 1280x1024 16/256K . A000 WD90C [1]
= G 160x64 8x16 1280x1024 16/256K . A000 Diamond Speedstar 24X [1]
65h = G . . 800x600 64K . A000 Cirrus CL-GD 5422/5426
= G . . 1024x768 16 . . Video7 V-RAM VGA
= G 128x48 8x16 1024x768 16 . A000 ATI VGA Wonder
66h = T 80x50 8x8 640x400 16/256K . B800 WD90C
= T 80x50 8x8 . 16 . B800 Diamond Speedstar 24X
= G . . 640x400 256 . . Tatung VGA
= G . . 640x400 256 . . Video7 V-RAM VGA
= G . . 640x480 32K . A000 Cirrus CL-GD 5422/5426
67h = T 80x43 8x8 640x344 16/256K . B800 WD90C
= T 80x43 8x8 . 16 . B800 Diamond Speedstar 24X
= G . . 640x480 256 . . Video7 V-RAM VGA
= G . . 800x600 32K . A000 Cirrus CL-GD 5422/5426
= G 128x48 8x16 1024x768 4 . A000 ATI VGA Wonder
= G 160x64 8x16 1280x1024 16 . A000 NCR 77C22 [1,9]
69h = T 132x50 8x8 1056x400 16/256K . B800 WD90C
= T 132x50 8x8 . 16 . B800 Diamond Speedstar 24X
= G . . 720x540 256 . . Video7 V-RAM VGA
6Ah = G . . 800x600 16 . A000 VESA standard interface
= G 100x75 8x8 800x600 16 . . Genoa 6400
= G 100x75 8x8 800x600 16 . . Diamond Speedstar 24X
= G . . 800x600 16 . A000 Ahead A
= G 100x75 8x8 800x600 16 1 A000 Ahead B (VESA) (see 71h)
= G . . 800x600 16 . . Zymos Poach, Hi Res 512
= G . . 800x600 16 . . Epson LT-386SX in CRT Mode
= G . . 800x600 16 . . Compuadd 316SL in CRT Mode
= G 100x37 8x16 800x600 16/256K . A000 Cirrus CL-GD5420/5422/5426
= G 100x42 8x14 800x600 . . A000 ATI VGA Wonder (undoc)
= G . . 800x600 16 . . Chips&Technologies chipset
= G 160x64 8x16 1280x1024 256 . A000 NCR 77C22 [1,9]
6Bh = T 100x37 8x16 . 16 . . Genoa 6400
= T 100x37 8x16 . . . . NEL Electronics BIOS
6Ch = G 80x30 8x16 640x480 16M . A000 Trident 8900CL/BIOS C04
= G 100x75 8x8 800x600 256 . . Genoa 6400
= G 160x60 8x16 1280x960 16/256K . A000 WD90C [1]
= G 160x60 8x16 1280x960 16/256K . A000 Diamond Speedstar 24X [1]
= G 160x64 8x16 1280x1024 16/256K . A000 Cirrus CL-GD 5422/5426 [1]
6Dh = G 80x25 8x14 640x350 64K . . STB Lightspeed ET4000/W32P
= G 160x64 8x16 1280x1024 256/256K . A000 Cirrus CL-GD 5422/5426 [1]
6Eh = G 40x25 8x8 320x200 64K . A000 Cirrus CL-GD 5422/5426
6Fh = G 40x25 8x8 320x200 16M . A000 Cirrus CL-GD 5422/5426
70h = extended mode set (see AX=0070h) . Everex Micro Enhancer EGA
= T 40x25 8x8 . 16 8 B800 Quadram (CGA double scan)
= T 40x25 8x8 (CGA dblscan) . . Genoa SuperEGA BIOS 3.0+
= G . . 360x480 256 . . Cirrus 510/520/5320 chips
= G 90x28 8x14 720x392 16 1 A000 Ahead B
= G . . 800x600 16 . . C&T chipset, Cardinal
= G . . 1024x480 256 . . Trident 8900C BIOS C3.0
71h = T 80x25 8x8 . 16 8 B800 Quadram (CGA double scan)
= T 80x25 8x8 (CGA dblscan) . . Genoa SuperEGA BIOS 3.0+
= G . . 528x400 256 . . Cirrus 510/520 chipset
= G 80x30 8x16 640x480 16M . A000 Cirrus CL-GD 5422/5426
= G 100x35 8x16 800x600 16/64 . A000 NSI Smart EGA+
= G 100x75 8x8 800x600 16 1 A000 Ahead B (same as 6Ah)
= G . . 960x720 16 . . C&T chipset, Cardinal
= G . . 1024x480 256 . . Trident 8900C BIOS C3.0
72h = T 80x60 8x8 . 16 . B800 Quadram Ultra VGA
= T 80x60 8x8 . 16 . B800 Genoa 6400
= T 80x60 8x8 . 16 . B800 Genoa SuperEGA BIOS 3.0+
= G . . 528x480 256 . . Cirrus 510/520 chipset
= G 80x25 8x19 640x480 16 1 A000 DOS/V w/ any VGA
= G . . 640x480 32K . A000 ATI
= G . . 640x480 16M . A000 WD90C
= G . . 640x480 16M . A000 Diamond Speedstar 24X
= G . . 1024x768 16 . . C&T chipset, Cardinal
73h = G 80x60 8x8 640x480 16 . A000 Quadram Ultra VGA
= G 80x60 8x8 640x480 16 . . Genoa 6400
= G 80x60 8x8 640x480 16 . . Genoa SuperEGA BIOS 3.0+
= T 80x25 8x19 640x475 16 1 none DOS/V, emulated in VGA graph
74h = T 80x66 8x8 . 16 . B800 Quadram Ultra VGA
= T 80x66 8x8 . 16 . B800 Genoa 6400
= T 80x66 8x8 . 16 . B800 Genoa SuperEGA BIOS 3.0+
= G . . 640x400 2 . B800 Toshiba 3100 AT&T mode
= G 80x30 8x16 640x480 32K . A000 Trident 8900C/BIOS C03
= G 128x48 8x16 1024x768 16 1 A000 Ahead A, Ahead B (512K)
= G . . 1024x768 64K . A000 Cirrus CL-GD 5422/5426 [1]
75h = G 80x30 8x16 640x480 64K . A000 Trident 8900C/BIOS C03
= G 80x66 . 640x528 16??? . A000 Quadram Ultra VGA
= G 80x66 . 640x528 16 . . Genoa SuperEGA BIOS 3.0+
= G 128x48 8x16 1024x768 4 1 A000 Ahead B
76h = T 94x29 8x14 . 16 . B800 Quadram Ultra VGA
= T 94x29 8x14 . . . . Genoa SuperEGA BIOS 3.0+
= G 100x75 8x8 800x600 32K . A000 Trident 8900C/BIOS C03
= G 128x48 8x16 1024x768 2 1 A000 Ahead B
77h = G 94x29 . 752x410 16??? . A000 Quadram Ultra VGA
= G 94x29 . 752x410 16 . . Genoa SuperEGA BIOS 3.0+
= G 100x75 8x8 800x600 64K . A000 Trident 8900C/BIOS C03
78h = T 100x37 8x16 . 16 . . Genoa 6400
= T 100x75 8x8 . 16 . B800 Quadram Ultra VGA
= T 100x75 8x8 . . . . Genoa SuperEGA BIOS 3.0+
= G . . 640x400 256 . . STB VGA/EM-16 Plus
= G . . 640x400 256 . . Cardinal, C&T chipset
= G . . 640x400 256 . . Cirrus 5320 chipset
79h = G . . 640x480 256 . . Cardinal, C&T chipset
= G 100x75 . 800x600 16??? . A000 Quadram Ultra VGA
= G 100x75 8x8 800x600 16 . . Genoa SuperEGA BIOS 3.0+
= G 100x75 8x8 800x600 16 . . Genoa 6400
7Ah = T 114x60 8x8 . 16 . B800 Quadram Ultra VGA
= T 114x60 8x8 . . . . Genoa SuperEGA BIOS 3.0+
= G . . 720x540 256 . . C&T chipset, Cardinal
7Bh = G . . 800x600 256 . . C&T chipset, Cardinal
= G 114x60 . 912x480 16??? . A000 Quadram Ultra VGA
= G . . 912x480 16 . . Genoa SuperEGA BIOS 3.0+
7Ch = G . . 512x512 16 . . Genoa
= G . . 800x600 256 . . C&T 82C453 chipset
7Dh = G 64x32 8x16 512x512 256 . . Genoa
7Eh = special mode set (see AX=007Eh) . Paradise VGA, AT&T VDC600
= G 80x25 8x16 640x400 256 . . Genoa 6400
= G . . 1024x768 256 . . C&T 82C453 chipset
= G 90x43 . . mono . B000 HERCULES.COM on HGC [14]
7Fh = special function set (see AX=007Fh) . Paradise VGA, AT&T VDC600
= G 128x48 8x16 1024x768 4 . . Genoa 6400
= G 90x29 . . mono . B000 HERCULES.COM on HGC [14]
82h = T 80x25 . . B&W . . AT&T VDC overlay mode [6]
83h = T 80x25 . . . . . AT&T VDC overlay mode [6]
86h = G . . 640x200 B&W . . AT&T VDC overlay mode [6]
88h = G 90x43 8x8 720x348 mono . B000 Hercules + MSHERC.COM
C0h = G . . 640x400 2/prog palette . AT&T VDC overlay mode [6]
= G . . 640x400 2/prog palette . Olivetti Quaderno overlay
C4h = disable output . . . . AT&T VDC overlay mode [6]
C8h = G 80x50 8x8 640x400 2 . B800 Olivetti Quaderno overlay
D0h = G . . 640x400 2 . B800 DEC VAXmate AT&T mode
Notes:
[1] interlaced only
[2] for ATI EGA Wonder, mode 08h is only valid if SMS.COM is loaded resident.
SMS maps mode 08h to mode 27h if the byte at location 0040:0063 is 0B4h,
otherwise to mode 23h, thus selecting the appropriate (monochrome or
color) 132x25 character mode.
for ATI VGA Wonder, mode 08h is the same, and only valid if VCONFIG loaded
resident
[3] early XGA boards support 132-column text but do not have this BIOS mode
[4] DESQview intercepts calls to change into these two modes (21h is page 0,
22h is page 1) even if there is no Hercules graphics board installed
[5] ATI BIOS v4-1.00 has a text-scrolling bug in this mode
[6] for AT&T VDC overlay modes, BL contains the DEB mode, which may be 06h,
40h, or 44h
[7] BIOS text support is broken in this undocumented mode; scrolling moves only
about 1/3 of the screen (and does even that portion incorrectly), while
screen clears only clear about 3/4.
[8] The Oak OTI-037/067/077 modes are present in the Oak VGA BIOS, which OEMs
may choose to use only partially or not at all; thus, not all Oak boards
support all "Oak" modes listed here
[9] this card uses the full 128K A000h-BFFFh range for the video buffer,
precluding the use of a monochrome adapter in the same system
[10] mode 17h supported by Tseng ET4000 BIOS 8.01X dated 09/14/90, but not
v8.01X dated 02/28/92; mode 21h supported by 02/28/92 version but not
09/14/90 version
[11] HERKULES simulates a 90x45 text mode in Hercules graphics mode; the
installation check for HERKULES.COM is the signature "Herkules" two bytes
beyond the INT 10 handler
[12] The Realtek RTVGA BIOS v3.C10 crashes when attempting to switch into modes
21h or 27h; this version of the BIOS also sets the BIOS data area
incorrectly for extended text modes, resulting in scrolling after only
24 lines (the VMODE.EXE utility does set the data area correctly)
[13] The Tandy 1000SL/TL BIOS does not actually support this mode
[14] HERCULES.COM is a graphics-mode BIOS extension for Hercules-compatible
graphics cards by Soft Warehouse, Inc. Its installation check is to
test whether the word preceding the INT 10 handler is 4137h.
[15] The Hercules-graphics video modes for HERCBIOS (shareware by Dave
Tutelman) may be changed by a command-line switch; the 90x43
character-cell mode's number is always one higher than the 90x29 mode
(whose default is mode 08h)
Index: video modes
Index: installation check;HERKULES|installation check;HERCULES.COM
--------V-100070-----------------------------
INT 10 - VIDEO - Everex Micro Enhancer EGA/Viewpoint VGA - EXTENDED MODE SET
AX = 0070h
BL = mode (see #0010)
Desc: specify a proprietary display mode on the Everex Micro Enhancer or
Viewpoint video adapters
SeeAlso: AH=00h,AX=6F05h,AX=7000h/BX=0004h,AH=FFh"GO32"

(Table 0010)
Values for Everex video mode:
text/ text pixel pixel colors disply scrn monitor adapter
grph resol box resolution pages addr
00h = G . . 640x480 16 . . multisync EGA,VGA
01h = G . . 752x410 16 . . multisync EGA,VGA
02h = G . . 800x600 16 . . multisync EGA,VGA
03h = T 80x34 . . . . . multisync EGA,VGA
04h = T 80x60 . . . . . multisync EGA,VGA
05h = T 94x29 . . . . . multisync EGA only
06h = T 94x51 . . . . . multisync EGA only
07h = T 100x43 8x14 . 16 . . . VGA only
08h = T 100x75 8x8 . 16 . . . VGA only
09h = T 80x44 . . . . . EGA EGA only
0Ah = T 132x25 . . . . . EGA EGA,VGA
0Bh = T 132x44 . . . . . EGA EGA,VGA
0Ch = T 132x25 . . . . . CGA EGA only
0Dh = T 80x44 . . . . . mono EGA only
0Eh = T 132x25 . . . . . mono
0Fh = T 132x44 . . . . . mono
10h = reserved
11h = G . . 1280x350 4 . . . EGA only
12h = G . . 1280x600 4 . . . EGA only
13h = G . . 640x350 256 . . . EGA,EV673
14h = G . . 640x400 256 . . .
15h = G . . 512x480 256 . . .
16h = T 80x30 8x16 . 256 . . . VGA only
18h = T 100x27 8x16 . 16 . . . VGA only
20h = G . . 1024x768 16 . . . Everex 629,678
. . . . . . . Everex EV-673
21h = T 160x64 8x16 1280x1024 16 . . . 1MB VGA only
30h = G . . 640x480 256 . . . Everex 629,678
. . . . . . . Everex EV-673
31h = G . . 800x600 256 . . . Everex 629,678
. . . . . . . Everex EV-673
32h = G 128x48 8x16 1024x768 256 . . . 1MB VGA only
40h = T 132x30 8x16 . 16 . . . VGA only
50h = T 132x32 8x16 . mono . . . VGA only
62h = G 40x25 8x8 320x200 32K . . . Vwpt TC (EV629)
70h = G 64x30 8x16 512x480 32K . . . Viewpoint TC
71h = G 80x30 8x16 640x480 32K . . . Viewpoint TC
76h = G 64x30 8x16 512x480 16M . . . Viewpoint TC
77h = G 80x30 8x16 640x480 16M . . . Viewpoint TC
Index: video modes;Everex
--------V-10007E-----------------------------
INT 10 - VIDEO - Paradise VGA, AT&T VDC600 - SET SPECIAL MODE
AX = 007Eh
BX = horizontal dimension of the mode desired
CX = vertical dimension of the mode desired
(both BX/CX in pixels for graphics modes, rows for alpha modes)
DX = number of colors of the mode desired (0000h for monochrome modes)
Return: BH = 7Eh if successful (Paradise VGA)
AL = 7Eh if successful (AT&T VDC600)
Desc: specify a display mode by resolution rather than mode number
SeeAlso: AH=00h,AX=0070h,AX=007Fh,AX=6F05h,AH=FFh"GO32"
Index: video modes;Paradise|video modes;AT&T
--------V-10007FBH00-------------------------
INT 10 - VIDEO - Paradise VGA, AT&T VDC600 - SET VGA OPERATION
AX = 007Fh
BH = 00h
Return: AL = 7Fh if successful (AT&T VDC600)
BH = status (Paradise/Dell)
00h invalid function
7Fh successful
SeeAlso: AX=007Fh/BH=01h,AX=007Fh/BH=02h
--------V-10007FBH01-------------------------
INT 10 - VIDEO - Paradise VGA, AT&T VDC600 - SET NON-VGA OPERATION
AX = 007Fh
BH = 01h
Return: AL = 7Fh if successful (AT&T VDC600)
BH = status (Paradise/Dell)
00h invalid function
7Fh successful
Note: color modes (0,1,2,3,4,5,6) will set non-VGA CGA operation, monochrome
mode 7 will set non-VGA MDA/Hercules operation
SeeAlso: AX=007Fh/BH=00h,AX=007Fh/BH=02h
--------V-10007FBH02-------------------------
INT 10 - VIDEO - Paradise VGA, AT&T VDC600 - QUERY MODE STATUS
AX = 007Fh
BH = 02h
Return: AL = 7Fh if successful (AT&T VDC600)
BH = status (Paradise/Dell)
00h invalid function
7Fh successful
---if successful---
BL = 00h if operating in VGA mode, 01h if non-VGA mode
CH = total video RAM size in 64k byte units
CL = video RAM used by the current mode
Note: under Novell DOS 7 TaskMgr Multitasker, this call always returns 0K
video memory in CX
SeeAlso: AX=007Fh/BH=00h,AX=007Fh/BH=01h
--------V-10007F-----------------------------
INT 10 - VIDEO - Paradise VGA, AT&T VDC600 - EXTENDED FUNCTIONS
AX = 007Fh
BH = function
03h lock current mode
allows current mode (VGA or non-VGA) to survive re-boot
04h enter MDA mode
05h enter CGA mode
06h enter monochrome VGA mode (also switches to video mode 7)
07h enter color VGA mode (also switches to video mode 3)
0Ah,0Bh,0Ch,0Dh,0Eh,0Fh WRITE PARADISE REGISTERS 0,1,2,3,4,5
(port 03CEh indices 0Ah,0Bh,0Ch,0Dh,0Eh,0Fh)
BL = value to set in the paradise register
1Ah,1Bh,1Ch,1Dh,1Eh,1Fh READ PARADISE REGISTERS 0,1,2,3,4,5
(port 03CEh indices 0Ah,0Bh,0Ch,0Dh,0Eh,0Fh)
Return: BL = value of the paradise register
BH = 7Fh if successful
29h-2Fh ??? (Paradise VGA for Dell, 7/24/91)
Return: AL = 7Fh if successful (AT&T VDC600)
BH = status (Paradise/Dell)
00h invalid function
7Fh successful
Desc: set emulation mode or access proprietary extended data registers
SeeAlso: AX=007Eh,AH=FF"Oak"
--------V-10007FBH60-------------------------
INT 10 - Paradise VGA - ???
AX = 007Fh
BH = 60h
BL = ??? (00h-13h)
???
Return: BH = status (00h failed or not supported, 7Fh successful)
???
Note: this function is supported by the 5/14/93 ROM for the Dell 486D
--------V-10007FBH61-------------------------
INT 10 - Paradise VGA - ???
AX = 007Fh
BH = 61h
ES:DI -> buffer for list of ??? (see #0011)
Return: BH = status (00h failed or not supported, 7Fh successful)
???
Note: this function is supported by the 5/14/93 ROM for the Dell 486D

Format of Paradise VGA list entry:
Offset Size Description (Table 0011)
00h BYTE ??? or 00h if end of list
01h BYTE ???
02h WORD ???
04h WORD ???
06h WORD ???
--------V-10007FBXA500-----------------------
INT 10 - Paradise VGA - ???
AX = 007Fh
BX = A500h
???
Return: BH = status (00h failed or not supported, 7Fh successful)
???
Note: this function is supported by the 5/14/93 ROM for the Dell 486D
--------V-10007FBHA5-------------------------
INT 10 - Paradise VGA - ???
AX = 007Fh
BH = A5h
BL = ???
bits 3-0: ??? (0-4)
bits 5,4: ???
???
Return: BH = status (00h failed or not supported, 7Fh successful)
???
Note: this function is supported by the 5/14/93 ROM for the Dell 486D
--------V-10007FBHA6-------------------------
INT 10 - Paradise VGA - ???
AX = 007Fh
BH = A6h
???
Return: BH = status (00h failed or not supported, 7Fh successful)
???
Note: this function is supported by the 5/14/93 ROM for the Dell 486D
--------V-1001-------------------------------
INT 10 - VIDEO - SET TEXT-MODE CURSOR SHAPE
AH = 01h
CH = cursor start and options (see #0012)
CL = bottom scan line containing cursor (bits 0-4)
Desc: specify the starting and ending scan lines to be occupied by the
hardware cursor in text modes
Notes: buggy on EGA systems--BIOS remaps cursor shape in 43 line modes, but
returns unmapped cursor shape
UltraVision scales size to the current font height by assuming 14-line
monochrome and 8-line color fonts; this call is not valid if cursor
emulation has been disabled
applications which wish to change the cursor by programming the
hardware directly on EGA or above should call INT 10/AX=1130h or
read 0040h:0085h first to determine the current font height
on some adapters, setting the end line greater than the number of lines
in the font will result in the cursor extending to the top of the
next character cell on the right
BUG: AMI 386 BIOS and AST Premier 386 BIOS will lock up the system if AL
is not equal to the current video mode
SeeAlso: AH=03h,AX=CD05h,AH=12h/BL=34h,#2469

Bitfields for cursor start and options:
Bit(s) Description (Table 0012)
7 should be zero
6,5 cursor blink
(00=normal, 01=invisible, 10=erratic, 11=slow)
(00=normal, other=invisible on EGA/VGA)
4-0 topmost scan line containing cursor
--------V-1002-------------------------------
INT 10 - VIDEO - SET CURSOR POSITION
AH = 02h
BH = page number
0-3 in modes 2&3
0-7 in modes 0&1
0 in graphics modes
DH = row (00h is top)
DL = column (00h is left)
SeeAlso: AH=03h,AH=05h,INT 60/DI=030Bh,MEM 0040h:0050h
--------V-1003-------------------------------
INT 10 - VIDEO - GET CURSOR POSITION AND SIZE
AH = 03h
BH = page number
0-3 in modes 2&3
0-7 in modes 0&1
0 in graphics modes
Return: AX = 0000h (Phoenix BIOS)
CH = start scan line
CL = end scan line
DH = row (00h is top)
DL = column (00h is left)
Notes: a separate cursor is maintained for each of up to 8 display pages
many ROM BIOSes incorrectly return the default size for a color display
(start 06h, end 07h) when a monochrome display is attached
SeeAlso: AH=01h,AH=02h,AH=12h/BL=34h,MEM 0040h:0050h,MEM 0040h:0060h
--------V-1004-------------------------------
INT 10 - VIDEO - READ LIGHT PEN POSITION (except VGA)
AH = 04h
Return: AH = light pen trigger flag
00h not down/triggered
01h down/triggered
DH,DL = row,column of character light pen is on
CH = pixel row (graphics modes 04h-06h)
CX = pixel row (graphics modes with >200 rows)
BX = pixel column
Desc: determine the current position and status of the light pen (if
present)
Notes: on a CGA, returned column numbers are always multiples of 2 (320-
column modes) or 4 (640-column modes)
returned row numbers are only accurate to two lines
--------V-1004------------------------------------
INT 10 - HUNTER 16 - GET CURSOR ADDRESS
AH = 04h
BH = page
Return: DH = row (0..24)
DL = column (0..79)
CH = cursor pixel Y-address (0..199)
CL = cursor pixel X-address (0..639)
Notes: the Husky Hunter 16 is an 8088-based ruggedized laptop. Other family
members are the Husky Hunter, Husky Hunter 16/80, and Husky Hawk.
pixel coordinates are for the lower left corner of the character cell
containing the cursor
SeeAlso: AH=60h"HUNTER"
--------V-1005-------------------------------
INT 10 - VIDEO - SELECT ACTIVE DISPLAY PAGE
AH = 05h
AL = new page number (00h to number of pages - 1) (see #0009)
Desc: specify which of possibly multiple display pages will be visible
Note: to determine whether the requested page actually exists, use AH=0Fh
to query the current page after making this call
SeeAlso: AH=0Fh,AH=43h,AH=45h,MEM 0040h:0062h
--------V-1005-------------------------------
INT 10 - VIDEO - PCjr, Tandy 1000 - MANIPULATE CRT/CPU PAGE REGISTERS
AH = 05h
AL = subfunction
80h read CRT and CPU page registers
Return: BH = CRT page register
BL = CPU page register
81h set CPU page register
BL = CPU page
82h set CRT page register
BH = CRT page
83h set both CPU and CRT page registers
BL = CPU page
BH = CRT page
Notes: the CPU page determines which 16K block of the first 128K of physical
memory will be mapped at B800h by the hardware
the CRT page determines the start address of the memory used by the
video controller
--------V-1005-------------------------------
INT 10 - VIDEO - Corona/Cordata BIOS v4.10+ - GRAPHICS BITMAP BUFFER
AH = 05h
AL = function
00h set address of graphics bitmap buffer (video modes 60h,61h)
BX = segment of buffer
0Fh get address of graphics bitmap buffer (video modes 60h,61h)
Return: DX = segment of graphics bitmap buffer
--------V-1006-------------------------------
INT 10 - VIDEO - SCROLL UP WINDOW
AH = 06h
AL = number of lines by which to scroll up (00h = clear entire window)
BH = attribute used to write blank lines at bottom of window
CH,CL = row,column of window's upper left corner
DH,DL = row,column of window's lower right corner
Note: affects only the currently active page (see AH=05h)
BUGS: some implementations (including the original IBM PC) have a bug which
destroys BP
the Trident TVGA8900CL (BIOS dated 9/8/92) clears DS to 0000h when
scrolling in an SVGA mode (800x600 or higher)
SeeAlso: AH=07h,AH=72h,AH=73h,AX=7F07h,INT 50/AX=0014h
--------V-1007-------------------------------
INT 10 - VIDEO - SCROLL DOWN WINDOW
AH = 07h
AL = number of lines by which to scroll down (00h=clear entire window)
BH = attribute used to write blank lines at top of window
CH,CL = row,column of window's upper left corner
DH,DL = row,column of window's lower right corner
Note: affects only the currently active page (see AH=05h)
BUGS: some implementations (including the original IBM PC) have a bug which
destroys BP
the Trident TVGA8900CL (BIOS dated 9/8/92) clears DS to 0000h when
scrolling in an SVGA mode (800x600 or higher)
SeeAlso: AH=06h,AH=72h,AH=73h,INT 50/AX=0014h
--------V-1008-------------------------------
INT 10 - VIDEO - READ CHARACTER AND ATTRIBUTE AT CURSOR POSITION
AH = 08h
BH = page number (00h to number of pages - 1) (see #0009)
Return: AH = character's attribute (text mode only) (see #0013)
AL = character
Notes: for monochrome displays, a foreground of 1 with background 0 is
underlined
the blink bit may be reprogrammed to enable intense background colors
using AX=1003h or by programming the CRT controller
the foreground intensity bit (3) can be programmed to switch between
character sets A and B on EGA and VGA cards, thus enabling 512
simultaneous characters on screen. In this case the bit's usual
function (intensity) is regularly turned off.
in graphics modes, only characters drawn with white foreground pixels
are matched by the pattern-comparison routine
SeeAlso: AH=09h,AX=1003h,AX=1103h,AH=12h/BL=37h,AX=5001h

Bitfields for character's display attribute:
Bit(s) Description (Table 0013)
7 foreground blink or (alternate) background bright (see also AX=1003h)
6-4 background color (see #0014)
3 foreground bright or (alternate) alternate character set (see AX=1103h)
2-0 foreground color (see #0014)
SeeAlso: #0025

(Table 0014)
Values for character color:
Normal Bright
000b black dark gray
001b blue light blue
010b green light green
011b cyan light cyan
100b red light red
101b magenta light magenta
110b brown yellow
111b light gray white
--------V-1009-------------------------------
INT 10 - VIDEO - WRITE CHARACTER AND ATTRIBUTE AT CURSOR POSITION
AH = 09h
AL = character to display
BH = page number (00h to number of pages - 1) (see #0009)
background color in 256-color graphics modes (ET4000)
BL = attribute (text mode) or color (graphics mode)
if bit 7 set in <256-color graphics mode, character is XOR'ed
onto screen
CX = number of times to write character
Notes: all characters are displayed, including CR, LF, and BS
replication count in CX may produce an unpredictable result in graphics
modes if it is greater than the number of positions remaining in the
current row
SeeAlso: AH=08h,AH=0Ah,AH=4Bh"GRAFIX",INT 17/AH=60h,INT 1F,INT 43,INT 44
--------V-100A-------------------------------
INT 10 - VIDEO - WRITE CHARACTER ONLY AT CURSOR POSITION
AH = 0Ah
AL = character to display
BH = page number (00h to number of pages - 1) (see #0009)
background color in 256-color graphics modes (ET4000)
BL = attribute (PCjr, Tandy 1000 only) or color (graphics mode)
if bit 7 set in <256-color graphics mode, character is XOR'ed
onto screen
CX = number of times to write character
Notes: all characters are displayed, including CR, LF, and BS
replication count in CX may produce an unpredictable result in graphics
modes if it is greater than the number of positions remaining in the
current row
SeeAlso: AH=08h,AH=09h,AH=4Bh,INT 17/AH=60h,INT 1F,INT 43,INT 44
--------V-100B--BH00-------------------------
INT 10 - VIDEO - SET BACKGROUND/BORDER COLOR
AH = 0Bh
BH = 00h
BL = background/border color (border only in text modes)
SeeAlso: AH=0Bh/BH=01h
--------V-100B--BH01-------------------------
INT 10 - VIDEO - SET PALETTE
AH = 0Bh
BH = 01h
BL = palette ID
00h background, green, red, and brown/yellow
01h background, cyan, magenta, and white
Note: this call was only valid in 320x200 graphics on the CGA, but newer
cards support it in many or all graphics modes
SeeAlso: AH=0Bh/BH=00h,MEM 0040h:0066h
--------V-100C-------------------------------
INT 10 - VIDEO - WRITE GRAPHICS PIXEL
AH = 0Ch
BH = page number
AL = pixel color
if bit 7 set, value is XOR'ed onto screen except in 256-color modes
CX = column
DX = row
Desc: set a single pixel on the display in graphics modes
Notes: valid only in graphics modes
BH is ignored if the current video mode supports only one page
SeeAlso: AH=0Dh,AH=46h
--------V-100D-------------------------------
INT 10 - VIDEO - READ GRAPHICS PIXEL
AH = 0Dh
BH = page number
CX = column
DX = row
Return: AL = pixel color
Desc: determine the current color of the specified pixel in grahics modes
Notes: valid only in graphics modes
BH is ignored if the current video mode supports only one page
SeeAlso: AH=0Ch,AH=47h
--------V-100E-------------------------------
INT 10 - VIDEO - TELETYPE OUTPUT
AH = 0Eh
AL = character to write
BH = page number
BL = foreground color (graphics modes only)
Desc: display a character on the screen, advancing the cursor and scrolling
the screen as necessary
Notes: characters 07h (BEL), 08h (BS), 0Ah (LF), and 0Dh (CR) are interpreted
and do the expected things
IBM PC ROMs dated 4/24/81 and 10/19/81 require that BH be the same as
the current active page
SeeAlso: AH=02h,AH=0Ah
--------b-100E--CXABCD-----------------------
INT 10 - V20-XT-BIOS - TELETYPE OUTPUT WITH ATTRIBUTE
AH = 0Eh
CX = ABCDh
BP = ABCDh
AL = character to write
BH = page number
BL = foreground color (text modes as well as graphics modes)
Program: V20-XT-BIOS is a ROM BIOS replacement with extensions by Peter
Koehlmann / c't magazine
Desc: display a character on the screen, advancing the cursor and scrolling
the screen as necessary
Notes: characters 07h (BEL), 08h (BS), 0Ah (LF), and 0Dh (CR) are interpreted
and do the expected things
SeeAlso: INT 15/AH=84h"V20-XT-BIOS"
--------V-100F-------------------------------
INT 10 - VIDEO - GET CURRENT VIDEO MODE
AH = 0Fh
Return: AH = number of character columns
AL = display mode (see #0009 at AH=00h)
BH = active page (see AH=05h)
Notes: if mode was set with bit 7 set ("no blanking"), the returned mode will
also have bit 7 set
EGA, VGA, and UltraVision return either AL=03h (color) or AL=07h
(monochrome) in all extended-row text modes
HP 200LX returns AL=07h (monochrome) if mode was set to AL=21h
and always 80 resp. 40 columns in all text modes regardless of
current zoom setting (see AH=D0h)
when using a Hercules Graphics Card, additional checks are necessary:
mode 05h: if WORD 0040h:0063h is 03B4h, may be in graphics page 1
(as set by DOSSHELL and other Microsoft software)
mode 06h: if WORD 0040h:0063h is 03B4h, may be in graphics page 0
(as set by DOSSHELL and other Microsoft software)
mode 07h: if BYTE 0040h:0065h bit 1 is set, Hercules card is in
graphics mode, with bit 7 indicating the page (mode set by
Hercules driver for Borland Turbo C)
SeeAlso: AH=00h,AH=05h,AX=10F2h/BL=00h,AX=1130h,AX=CD04h
--------V-100F56BX4756-----------------------
INT 10 - VUIMAGE DISPLAY DRIVER (v2.20 and below)
AX = 0F56h
BX = 4756h
CX = 4944h
DL = function
01h installation check
Return: AX = 5649h
BX = 4443h
CX = 5647h
DH = 01h
02h get first video mode's parameters
Return: AX = BIOS mode number
BX = width in pixels
CX = height in pixels
DX = number of colors
03h get next video mode's parameters
Return: as for DL=02h
04h display line???
ES:DI -> record (see #0015)
???
Return: ???
Program: VUIMAGE is a shareware GIF/TIFF image viewer by Offe Enterprises
Note: the use of TSR display drivers was discontinued after v2.20
Index: installation check;VUIMAGE display driver

Format of record for VUIMAGE Function 04h:
Offset Size Description (Table 0015)
00h WORD row number
02h WORD starting column???
04h WORD ending column???
???
--------V-100F--SIF123-----------------------
INT 10 - FRIEZE v7.41+ - INSTALLATION CHECK
AH = 0Fh
SI = F123h
DI = 321Fh
Return: AH = number of character columns
AL = display mode (see #0009 at AH=00h)
BH = active page (see AH=05h)
SI = DI = F345h if installed
Notes: if mode was set with bit 7 set ("no blanking"), the returned mode will
also have bit 7 set
EGA, VGA, and UltraVision return either AL=03h (color) or AL=07h
(monochrome) in all extended-row text modes
SeeAlso: AH=0Fh"VIDEO",AH=4Bh"FRIEZE"
--------V-1010-------------------------------
INT 10 - BIOS Window Extension v1.1 - SET WINDOW COORDINATES
AH = 10h
CH,CL = row,column of upper left corner of window
DH,DL = row,column of lower right corner of window
Return: AL = status
00h successful
01h failed
AH destroyed
Program: BWE is a TSR by John J. Seal published in May 1986 Dr. Dobb's Journal
Note: when a window has been set, all output via AH=0Eh is restricted to
the specified window
SeeAlso: AH=11h"Window",AH=12h"Window"
--------V-1010-------------------------------
INT 10 - VIDEO - Eagle PC2 BIOS Rev. C - SET SCROLL SPEED
AH = 10h
AL = speed
00h fast
01h slow (scrolling only moves characters during vertical retrace)
Return: AH = previous speed
--------V-101000-----------------------------
INT 10 - VIDEO - SET SINGLE PALETTE REGISTER (PCjr,Tandy,EGA,MCGA,VGA)
AX = 1000h
BL = palette register number (00h-0Fh)
= attribute register number (undocumented) (see #0016)
BH = color or attribute register value
Notes: on MCGA, only BX = 0712h is supported
under UltraVision, the palette locking status (see AX=CD01h)
determines the outcome
SeeAlso: AX=1002h,AX=1007h,AX=CD01h

(Table 0016)
Values for attribute register number:
10h attribute mode control register (should let BIOS control this)
11h overscan color register (see also AX=1001h)
12h color plane enable register (bits 3-0 enable corresponding
text attribute bit)
13h horizontal PEL panning register
14h color select register
--------V-101001-----------------------------
INT 10 - VIDEO - SET BORDER (OVERSCAN) COLOR (PCjr,Tandy,EGA,VGA)
AX = 1001h
BH = border color (00h-3Fh)
BUG: the original IBM VGA BIOS incorrectly updates the parameter save area
and places the border color at offset 11h of the palette table
rather than offset 10h
Note: under UltraVision, the palette locking status (see AX=CD01h)
determines the outcome
SeeAlso: AX=1002h,AX=1008h,AX=CD01h
--------V-101002-----------------------------
INT 10 - VIDEO - SET ALL PALETTE REGISTERS (PCjr,Tandy,EGA,VGA)
AX = 1002h
ES:DX -> palette register list (see #0017)
BH = 00h to avoid problems on some adapters
Note: under UltraVision, the palette locking status (see AX=CD01h)
determines the outcome
SeeAlso: AX=1000h,AX=1001h,AX=1009h,AX=CD01h

Format of palette register list:
Offset Size Description (Table 0017)
00h 16 BYTEs colors for palette registers 00h through 0Fh
10h BYTE border color
--------V-101003-----------------------------
INT 10 - VIDEO - TOGGLE INTENSITY/BLINKING BIT (Jr, PS, TANDY 1000, EGA, VGA)
AX = 1003h
BL = new state
00h background intensity enabled
01h blink enabled
BH = 00h to avoid problems on some adapters
Notes: although there is no function to get the current status on adapters
prior to the VGA, bit 5 of 0040h:0065h indicates the state; on the
VGA, use AH=1Bh and check offset 2Dh of the returned data (see #0037)
when configured for a monochrome display, the Boca Research Multi-EGA
with ROM v M1.1 Type D has its screen disrupted if BH is not clear
this call is reported to be "Get Cursor Position" on the Tandy
1000SL/TL
SeeAlso: AH=08h,AH=1Bh
--------V-101007-----------------------------
INT 10 - VIDEO - GET INDIVIDUAL PALETTE REGISTER (VGA,UltraVision v2+)
AX = 1007h
BL = palette or attribute (undoc) register number (see #0016)
Return: BH = palette or attribute register value
Note: UltraVision v2+ supports this function even on color EGA systems in
video modes 00h-03h, 10h, and 12h; direct programming of the palette
registers will cause incorrect results because the EGA registers are
write-only. To guard against older versions or unsupported video
modes, programs which expect to use this function on EGA systems
should set BH to FFh on entry.
SeeAlso: AX=1000h,AX=1009h
--------V-101008-----------------------------
INT 10 - VIDEO - READ OVERSCAN (BORDER COLOR) REGISTER (VGA,UltraVision v2+)
AX = 1008h
Return: BH = border color (00h-3Fh)
Note: (see AX=1007h)
SeeAlso: AX=1001h
--------V-101009-----------------------------
INT 10 - VIDEO - READ ALL PALETTE REGISTERS AND OVERSCAN REGISTER (VGA)
AX = 1009h
ES:DX -> 17-byte buffer for palette register list (see #0017)
Note: UltraVision v2+ supports this function even on color EGA systems in
video modes 00h-03h, 10h, and 12h; direct programming of the palette
registers will cause incorrect results because the EGA registers are
write-only. To guard against older versions or unsupported video
modes, programs which expect to use this function on EGA systems
should set the ES:DX buffer to FFh before calling.
SeeAlso: AX=1002h,AX=1007h,AX=CD02h
--------V-101010-----------------------------
INT 10 - VIDEO - SET INDIVIDUAL DAC REGISTER (VGA/MCGA)
AX = 1010h
BX = register number
CH = new value for green (0-63)
CL = new value for blue (0-63)
DH = new value for red (0-63)
SeeAlso: AX=1012h,AX=1015h
--------V-101012-----------------------------
INT 10 - VIDEO - SET BLOCK OF DAC REGISTERS (VGA/MCGA)
AX = 1012h
BX = starting color register
CX = number of registers to set
ES:DX -> table of 3*CX bytes where each 3 byte group represents one
byte each of red, green and blue (0-63)
SeeAlso: AX=1010h,AX=1017h,INT 62/AX=00A5h
--------V-101013-----------------------------
INT 10 - VIDEO - SELECT VIDEO DAC COLOR PAGE (VGA)
AX = 1013h
BL = subfunction
00h select paging mode
BH = 00h select 4 blocks of 64
BH = 01h select 16 blocks of 16
01h select page
BH = page number (00h to 03h) or (00h to 0Fh)
Note: this function is not valid in mode 13h
SeeAlso: AX=101Ah
--------V-101015-----------------------------
INT 10 - VIDEO - READ INDIVIDUAL DAC REGISTER (VGA/MCGA)
AX = 1015h
BL = palette register number
Return: DH = red value
CH = green value
CL = blue value
AX destroyed by some BIOSes
(e.g. Tseng ET4000 BIOS v8.00n always returns AX=00C9h)
SeeAlso: AX=1010h,AX=1017h
--------V-101017-----------------------------
INT 10 - VIDEO - READ BLOCK OF DAC REGISTERS (VGA/MCGA)
AX = 1017h
BX = starting palette register
CX = number of palette registers to read
ES:DX -> buffer (3 * CX bytes in size) (see also AX=1012h)
Return: buffer filled with CX red, green and blue triples
SeeAlso: AX=1012h,AX=1015h,INT 62/AX=00A4h
--------V-101018-----------------------------
INT 10 U - VIDEO - SET PEL MASK (VGA/MCGA)
AX = 1018h
BL = new PEL value
SeeAlso: AX=1019h
--------V-101019-----------------------------
INT 10 U - VIDEO - READ PEL MASK (VGA/MCGA)
AX = 1019h
Return: BL = value read
SeeAlso: AX=1018h
--------V-10101A-----------------------------
INT 10 - VIDEO - GET VIDEO DAC COLOR-PAGE STATE (VGA)
AX = 101Ah
Return: BL = paging mode
00h four pages of 64
01h sixteen pages of 16
BH = current page
SeeAlso: AX=1013h
--------V-10101B-----------------------------
INT 10 - VIDEO - PERFORM GRAY-SCALE SUMMING (VGA/MCGA)
AX = 101Bh
BX = starting palette register
CX = number of registers to convert
Desc: convert the RGB values of one or more palette registers such that the
resulting values are grays with the same intensities as the original
colors
SeeAlso: AH=12h/BL=33h
--------V-1010E0-----------------------------
INT 10 - VIDEO - Diamond Speedstar 24 - SET 24-BIT GRAPHICS MODE
AX = 10E0h
BL = video mode (see also #0009 at AH=00h)
2Eh = 640x480
Return: ???
SeeAlso: AH=00h,AX=10F0h
--------V-1010F0-----------------------------
INT 10 - VIDEO - Tseng ET-4000 BIOS - SET HiColor GRAPHICS MODE
AX = 10F0h
BL = video mode (see also #0009 at AH=00h)
13h = 320x200x32K
2Dh = 640x350x32K
2Eh = 640x480x32K
2Fh = 640x400x32K
30h = 800x600x32K
3Eh = 640x480x16M (Genoa 7900)
FFh Tseng 24-bit color mode
BH = mode
2Dh = 640x480
2Eh = 640x480x16M
2Fh = 640x400
30h = 800x600
38h = 1024x768??? (Tseng ET4000/W32i)
Return: AL = 10h if supported
AH = status
00h if successful
other on error
Desc: switch the display into a graphics mode with 15 or more bits per pixel
Note: the Tseng HiColor BIOS extensions are supported by:
Diamond Computer Systems SpeedStar HiColor VGA
Everex Systems HC VGA
Focus Information Systems 2theMax 4000
Cardinal Technologies VGA732
Orchid ProDesigner IIs Genoa 7900
SeeAlso: AH=00h,AX=10E0h,AX=10F1h,AX=10F2h
Index: video modes;Tseng Hi-Color
--------V-1010F1-----------------------------
INT 10 - VIDEO - Tseng ET-4000 BIOS - GET DAC TYPE
AX = 10F1h
Return: AL = 10h if supported
BL = type of digital/analog converter (see #0018)
Desc: determine which type of digital-to-analog converter is installed on the
display board
SeeAlso: AX=10F0h,AX=10F2h

(Table 0018)
Values for type of DAC:
00h normal VGA DAC
01h Sierra SC1148x HiColor DAC
---Diamond SpeedStar 24---
02h new Sierra SS24 DAC (24-bit)
---generic Tseng BIOS v8+ ---
02h Sierra Mark2 (15-bit) or Mark3 (15/16-bit) DAC
03h ATT20c490/1/2 (15/16/24-bit)
04h AcuMos ADAC1 (15/16/24-bit)
05h unknown 15/16/24-bit DAC
06h Cirrus Internal 15/16/24-bit (CL-GD54xx series adapters)
07h Diamond SS2410 (15/24-bit)
08h unknown 15/16/24-bit DAC
09h unknown 15/16/24-bit DAC
else other HiColor DAC
--------V-1010F2-----------------------------
INT 10 u - VIDEO - Tseng ET-4000 BIOS - CHECK IF HiColor MODE/SET HiColor MODE
AX = 10F2h
BL = function
00h get current HiColor mode
01h set 15-bit HiColor mode
02h set 16-bit HiColor mode
Return: AX = 0010h if supported
BL = video mode type
00h not in HiColor mode
01h 15-bit RGB mode
02h 16-bit RGB mode
03h 24-bit RGB mode
Desc: determine whether the display is in a graphics mode with 15 or more
bits per pixel color resolution
Note: set (BL=01h/02h) only works if already in a HiColor mode
SeeAlso: AH=0Fh,AX=10F0h,AX=10F1h
--------V-1011-------------------------------
INT 10 - BIOS Window Extension v1.1 - GET WINDOW COORDINATES
AH = 11h
Return: CH,CL = row,column of upper left corner
DH,DL = row,column of lower right corner
Desc: determine the portion of the display to which output is restricted
Program: BWE is a TSR by John J. Seal published in May 1986 Dr. Dobb's Journal
SeeAlso: AH=10h"Window",AH=12h"Window"
--------V-1011-------------------------------
INT 10 - VIDEO - TEXT-MODE CHARACTER GENERATOR FUNCTIONS (PS, EGA, VGA)
AH = 11h
The following functions will cause a mode set, completely resetting
the video environment, but without clearing the video buffer
AL = 00h, 10h: load user-specified patterns
ES:BP -> user table
CX = count of patterns to store
DX = character offset into map 2 block
BL = block to load in map 2
BH = number of bytes per character pattern
AL = 01h, 11h: load ROM monochrome patterns (8 by 14)
BL = block to load
AL = 02h, 12h: load ROM 8 by 8 double-dot patterns
BL = block to load
AL = 03h: set block specifier (allows dual character sets on screen)
BL = block specifier (see #0019)
AL = 04h, 14h: load ROM 8x16 character set (VGA)
BL = block to load
Notes: The routines called with AL=1xh are designed to be called only
immediately after a mode set and are similar to the routines called
with AL=0xh, except that:
Page 0 must be active.
Bytes/character is recalculated.
Max character rows is recalculated.
CRT buffer length is recalculated.
CRTC registers are reprogrammed as follows:
R09 = bytes/char-1 ; max scan line (mode 7 only)
R0A = bytes/char-2 ; cursor start
R0B = 0 ; cursor end
R12 = ((rows+1)*(bytes/char))-1 ; vertical display end
R14 = bytes/char ; underline loc
(*** BUG: should be 1 less ***)
the current block specifiers may be determined with INT 10/AH=1Bh,
looking at offsets 2Bh and 2Ch of the returned data (VGA only)
(see AH=1Bh,#0037)
SeeAlso: AH=1Bh,AX=CD10h

Bitfields for block specifier:
Bit(s) Description (Table 0019)
---EGA/MCGA---
0,1 block selected by characters with attribute bit 3 clear
2,3 block selected by characters with attribute bit 3 set
---VGA---
0,1,4 block selected by characters with attribute bit 3 clear
2,3,5 block selected by characters with attribute bit 3 set
--------V-1011-------------------------------
INT 10 - VIDEO - Realtek RTVGA - TEXT-MODE CHARACTER GENERATOR FUNCTIONS
AH = 11h
AL = 07h load user-specified paterns and recalculate mode parms
parameters are the same as for AL = 10h
AL = 08h load monochrome patterns (8x14) and recalculate mode parms
parameters are the same as for AL = 11h
AL = 09h load ROM 8 by 8 double-dot patterns and recalculate mode parms
parameters are the same as for AL = 12h
AL = 0Bh load ROM 8x16 character set (VGA) and recalculate mode parms
parameters are the same as for AL = 14h
Note: these functions should only be called under the same conditions as
AL=1xh (see entry above)
SeeAlso: AH=11h
--------V-10110F-----------------------------
INT 10 - VIDEO - Realtek RTVGA - SET USER 8x8 GRAPHICS CHARACTERS
AX = 110Fh
ES:BP -> user table for INT 1F
Note: this function is meant to be called immediately after a mode set;
results are unpredictable at other times
SeeAlso: AX=1110h,AX=1111h,AX=1112h,AX=1120h
--------V-101110-----------------------------
INT 10 - VIDEO - Realtek RTVGA - SET USER GRAPHICS CHARACTERS
AX = 1110h
ES:BP -> user table
CX = bytes per character
BL = row specifier
00h user set
DL = number of rows
01h 14 rows
02h 25 rows
03h 43 rows
Note: this function is meant to be called immediately after a mode set;
results are unpredictable at other times
SeeAlso: AX=110Fh,AX=1112h,AX=1121h
--------V-101111-----------------------------
INT 10 - VIDEO - Realtek RTVGA - SET ROM 8x14 GRAPHICS CHARACTERS
AX = 1111h
BL = row specifier (see AX=1121h)
Note: this function is meant to be called immediately after a mode set;
results are unpredictable at other times
SeeAlso: AX=110Fh,AX=1110h,AX=1122h
--------V-101112-----------------------------
INT 10 - VIDEO - Realtek RTVGA - SET ROM 8x8 DOUBLE-DOT CHARACTERS
AX = 1112h
BL = row specifier (see AX=1121h)
Note: this function is meant to be called immediately after a mode set;
results are unpredictable at other times
SeeAlso: AX=110Fh,AX=1110h,AX=1111h,AX=1123h
--------V-101120-----------------------------
INT 10 - VIDEO - GRAPH-MODE CHARGEN - SET USER 8x8 GRAPHICS CHARS (PS,EGA,VGA)
AX = 1120h
ES:BP -> user table for INT 1F
Note: this function is meant to be called immediately after a mode set;
results are unpredictable at other times
SeeAlso: AX=1121h,AX=1122h,AX=1123h,AX=1124h,AX=1125h,INT 1F,INT 43
--------V-101121-----------------------------
INT 10 - VIDEO - GRAPH-MODE CHARGEN - SET USER GRAPHICS CHARACTERS (PS,EGA,VGA)
AX = 1121h
ES:BP -> user table
CX = bytes per character
BL = row specifier
00h user set
DL = number of rows
01h 14 rows
02h 25 rows
03h 43 rows
Note: this function is meant to be called immediately after a mode set;
results are unpredictable at other times
SeeAlso: AX=1120h,AX=1122h,AX=1123h,AX=1124h,AX=1129h,INT 1F,INT 43
--------V-101122-----------------------------
INT 10 - VIDEO - GRAPH-MODE CHARGEN - SET ROM 8x14 GRAPHICS CHARS (PS,EGA,VGA)
AX = 1122h
BL = row specifier (see AX=1121h)
Notes: this function is meant to be called immediately after a mode set;
results are unpredictable at other times
UltraVision v2+ sets INT 43 to the appropriate font on this call
SeeAlso: AX=1111h,AX=1120h,AX=1121h,AX=1123h,AX=1124h,AX=1129h,INT 1F,INT 43
--------V-101123-----------------------------
INT 10 - VIDEO - GRAPH-MODE CHARGEN - SET ROM 8x8 DOUBLE-DOT CHARS (PS,EGA,VGA)
AX = 1123h
BL = row specifier (see AX=1121h)
Notes: this function is meant to be called immediately after a mode set;
results are unpredictable at other times
UltraVision v2+ sets INT 43 to the appropriate font on this call
SeeAlso: AX=1112h,AX=1120h,AX=1121h,AX=1122h,AX=1124h,AX=1129h,INT 1F,INT 43
--------V-101124-----------------------------
INT 10 - VIDEO - GRAPH-MODE CHARGEN - LOAD 8x16 GRAPHICS CHARS (VGA,MCGA)
AX = 1124h
BL = row specifier (see AX=1121h)
Notes: this function is meant to be called immediately after a mode set;
results are unpredictable at other times
UltraVision v2+ sets INT 43 to the appropriate font on this call
SeeAlso: AX=1120h,AX=1121h,AX=1122h,AX=1123h,AX=1129h,INT 1F,INT 43
--------V-101129-----------------------------
INT 10 - VIDEO - GRAPH-MODE CHARGEN - LOAD 8x16 GRAPH CHARS (Compaq Systempro)
AX = 1129h
BL = row specifier (see AX=1121h)
Notes: this function is meant to be called immediately after a mode set;
results are unpredictable at other times
UltraVision v2+ sets INT 43 to the appropriate font on this call
SeeAlso: AX=1120h,AX=1121h,AX=1122h,AX=1123h,AX=1124h,INT 1F, INT 43
--------V-101130-----------------------------
INT 10 - VIDEO - GET FONT INFORMATION (EGA, MCGA, VGA)
AX = 1130h
BH = pointer specifier
00h INT 1Fh pointer
01h INT 43h pointer
02h ROM 8x14 character font pointer
03h ROM 8x8 double dot font pointer
04h ROM 8x8 double dot font (high 128 characters)
05h ROM alpha alternate (9 by 14) pointer (EGA,VGA)
06h ROM 8x16 font (MCGA, VGA)
07h ROM alternate 9x16 font (VGA only) (see #0020)
11h (UltraVision v2+) 8x20 font (VGA) or 8x19 font (autosync EGA)
12h (UltraVision v2+) 8x10 font (VGA) or 8x11 font (autosync EGA)
Return: ES:BP = specified pointer
CX = bytes/character of on-screen font (not the requested font!)
DL = highest character row on screen
Note: for UltraVision v2+, the 9xN alternate fonts follow the corresponding
8xN font at ES:BP+256N
BUG: the IBM EGA and some other EGA cards return in DL the number of rows on
screen rather than the highest row number (which is one less).
SeeAlso: AX=1100h,AX=1120h,INT 1F,INT 43

Format of alternate font table [array]:
Offset Size Description (Table 0020)
00h BYTE character to be replaced (00h = end of table)
01h N BYTEs graphics data for character, one byte per scan line
--------V-101130BX4D4F-----------------------
INT 10 - M10_SCR.COM v3.5+ - INSTALLATION CHECK
AX = 1130h
BX = 4D4Fh
Return: CX = 4F4Dh if installed
ES:BP -> M10_SCR INT 10 handler
Program: M10_SCR is a shareware extended text mode and font driver by
I.V. Morozov
SeeAlso: INT 16/AX=4D4Fh
--------V-1012-------------------------------
INT 10 - BIOS Window Extension v1.1 - GET BLANKING ATTRIBUTE
AH = 12h
Return: BH = attribute to use on blanked lines when scrolling
Program: BWE is a TSR by John J. Seal published in May 1986 Dr. Dobb's Journal
SeeAlso: AH=11h"Window",AH=12h"Window"
--------V-1012--BL10-------------------------
INT 10 - VIDEO - ALTERNATE FUNCTION SELECT (PS, EGA, VGA, MCGA) - GET EGA INFO
AH = 12h
BL = 10h
Return: BH = video state
00h color mode in effect (I/O port 3Dxh)
01h mono mode in effect (I/O port 3Bxh)
BL = installed memory (00h = 64K, 01h = 128K, 02h = 192K, 03h = 256K)
CH = feature connector bits (see #0021)
CL = switch settings (see #0022,#0023)
AH destroyed (at least by Tseng ET4000 BIOS v8.00n)
Note: one possible check for the presence of an EGA or later display card
is to call this function with BH=FFh; if not present, BH will be
unchanged on return
another installation check is used by Athena Digital's HGCIBM, which
sets CX to FFFFh on calling and checks whether it has been changed
on return
Index: installation check;EGA

Bitfields for feature connector bits:
Bit(s) Description (Table 0021)
0 FEAT 1 line, state 2
1 FEAT 0 line, state 2
2 FEAT 1 line, state 1
3 FEAT 0 line, state 1
4-7 unused (0)

Bitfields for switch settings:
Bit(s) Description (Table 0022)
0 switch 1 OFF
1 switch 2 OFF
2 switch 3 OFF
3 switch 4 OFF
4-7 unused

(Table 0023)
Values for switch settings on original EGA/VGA:
00h primary MDA/HGC, secondary EGA+ 40x25
01h-03h primary MDA/HGC, secondary EGA+ 80x25
04h primary CGA 40x25, secondary EGA+ 80x25 mono
05h primary CGA 80x25, secondary EGA+ 80x25 mono
06h primary EGA+ 40x25, secondary MDA/HGC (optional)
07h-09h primary EGA+ 80x25, secondary MDA/HGC (optional)
0Ah primary EGA+ 80x25 mono,secondary CGA 40x25 (optional)
0Bh primary EGA+ 80x25 mono,secondary CGA 80x25 (optional)
--------V-1012--BL11-------------------------
INT 10 - VIDEO - Trident TVGA 8800/8900/9000 BIOS - GET BIOS INFO
AH = 12h
BL = 11h
Return: AL = 12h if function supported
BL = ??? (10h)
ES:BP -> BIOS info structure (see #0024)
SeeAlso: AH=12h/BL=12h"TRIDENT"

Format of Trident BIOS Info structure:
Offset Size Description (Table 0024)
00h BYTE ??? (0000h)
01h BYTE OEM Code (00h for original Trident)
02h WORD ID??? (1073h for 8800BR, 1074 for 8800CS)
04h 8 BYTEs BIOS date ('mm/dd/yy')
0Ch WORD ???
0Eh 8 BYTEs BIOS Version (' C3-128 ', ' C3-129 ')
--------V-1012--BL12-------------------------
INT 10 - VIDEO - Trident TVGA 8800/8900/9000 BIOS - GET VIDEO RAM SIZE
AH = 12h
BL = 12h
Return: AL = 12h if function supported
AH = number of 256K banks of RAM installed
SeeAlso: AH=12h/BL=11h"TRIDENT"
--------V-1012--BL20-------------------------
INT 10 - VIDEO - ALTERNATE FUNCTION SELECT (PS,EGA,VGA,MCGA) - ALTERNATE PRTSC
AH = 12h
BL = 20h select alternate print screen routine
Desc: installs a PrtSc routine from the video card's BIOS to replace the
default PrtSc handler from the ROM BIOS, which usually does not
understand screen heights other than 25 lines
Note: some adapters disable print-screen instead of enhancing it
SeeAlso: INT 05
--------V-1012--BL2E-------------------------
INT 10 - Tseng ET-4000 BIOS v3.00 and v8.00 - BUG
AH = 12h
BL = 2Eh
Note: due to an omitted end-of-list marker, these versions of the BIOS will
crash the system on this function
--------V-1012--BL30-------------------------
INT 10 - VIDEO - ALTERNATE FUNCTION SELECT (VGA) - SELECT VERTICAL RESOLUTION
AH = 12h
BL = 30h
AL = vertical resolution
00h 200 scan lines
01h 350 scan lines
02h 400 scan lines
Return: AL = 12h if function supported
Desc: specify the number of scan lines used to display text modes
Note: the specified resolution will take effect on the next mode set
SeeAlso: AH=00h
--------V-1012--BL31-------------------------
INT 10 - VIDEO - ALTERNATE FUNCTION SELECT (VGA, MCGA) - PALETTE LOADING
AH = 12h
BL = 31h
AL = new state
00h enable default palette loading
01h disable default palette loading
Return: AL = 12h if function supported
Desc: specify whether a default palette should be loaded when the display
mode is set
SeeAlso: AH=00h
--------V-1012--BL32-------------------------
INT 10 - VIDEO - ALTERNATE FUNCTION SELECT (VGA, MCGA) - VIDEO ADDRESSING
AH = 12h
BL = 32h
AL = new state
00h enable video addressing
01h disable video addressing
Return: AL = 12h if function supported
Desc: specify whether the CPU should have access to video memory and the
display adapters I/O registers
--------V-1012--BL33-------------------------
INT 10 - VIDEO - ALTERNATE FUNCTION SELECT (VGA, MCGA) - GRAY-SCALE SUMMING
AH = 12h
BL = 33h
AL = new state
00h enable gray scale summing
01h disable gray scale summing
Return: AL = 12h if function supported
Desc: specify whether or not colors should be converted to gray scale when
palette or color registers are loaded
SeeAlso: AX=101Bh,AX=BF06h,AX=BF08h
--------V-1012--BL34-------------------------
INT 10 - VIDEO - ALTERNATE FUNCTION SELECT (VGA) - CURSOR EMULATION
AH = 12h
BL = 34h
AL = new state
00h enable alphanumeric cursor emulation
01h disable alphanumeric cursor emulation
Return: AL = 12h if function supported
Desc: specify whether the BIOS should automatically remap cursor start/end
according to the current character height in text modes
SeeAlso: AH=01h,AH=03h
--------V-1012--BL35-------------------------
INT 10 - VIDEO - ALTERNATE FUNCTION SELECT (PS) - DISPLAY-SWITCH INTERFACE
AH = 12h
BL = 35h
AL = subfunction
00h initial adapter video off
01h initial planar video on
02h switch active video off
03h switch inactive video on
80h *UNDOCUMENTED* set system board video active flag
ES:DX -> buffer for 128 byte save area (if AL = 00h-03h)
Return: AL = 12h if function supported
Desc: switch between two video adapters which may otherwise have address
conflicts
--------V-1012--BL36-------------------------
INT 10 - VIDEO - ALTERNATE FUNCTION SELECT (PS, VGA) - VIDEO REFRESH CONTROL
AH = 12h
BL = 36h
AL = new state
00h enable refresh
01h disable refresh
Return: AL = 12h if function supported
Desc: specify whether the contents of video memory should be displayed on
the screen; disabling refresh effectively blanks the screen
Note: when display refresh is disabled, the entire screen displays the color
specified by the DAC color register 00h; thus to actually blank the
screen, the application must first ensure that that register has been
set to black
BUG: GEM/VIEWMAX ET3000 and ET4000 drivers dated 6/23/88 do not correctly
reenable refresh after the screen has been blanked due to inactivity,
resulting in a total loss of video synchronization
SeeAlso: AX=BF05h
--------V-1012--BL37-------------------------
INT 10 - VIDEO - XGA - MAINFRAME INTERACTIVE SUPPORT
AH = 12h
BL = 37h
AL = text attribute type (00h normal VGA, 01h mainframe type)
Return: AL = 12h if supported
SeeAlso: #0025,AH=08h

Bitfields for XGA mainframe type character attributes:
Bit(s) Description (Table 0025)
7 blink double rate (75% ON time) or use color 8 as background
(see AX=1003h)
6 reverse video
5 underlined
4 left-most and right-most dots of underline area inverted
3 foreground intensity/character font select
2-0 foreground color
SeeAlso: #0013,#0033
--------V-1012--BL53-------------------------
INT 10 - Tseng ET-4000 BIOS v8.00 (06/07/91) - BUG
AH = 12h
BL = 53h
Note: due to an omitted end-of-list marker, this version of the BIOS will
crash the system on this function
--------V-1012--BL57-------------------------
INT 10 - Tseng ET-4000 BIOS v8.00 (06/07/91) - BUG
AH = 12h
BL = 57h
Note: due to an omitted end-of-list marker, this version of the BIOS will
crash the system on this function
--------V-1012--BH55-------------------------
INT 10 - VIDEO - ALTERNATE FUNC SELECT (ATI,Tatung,Taxan) - ENHANCED FEATURES
AH = 12h
BH = 55h
BL = subfunction
00h disable enhanced features
01h enable enhanced features
02h get status
Return: AL = status flags (see #0026)
03h disable register trapping (CGA emulation)
04h enable register trapping
05h program video mode
ES:BP -> video mode table (see #0027)
06h get mode table
AL = video mode
Return: ES:BP -> table suitable for mode AL
(and subfunc BL=05h) (see #0027)
BP = FFFFh on error
SI = 0000h (ATI Mach32)
Note: the ATI Mouse driver (MOUSE.COM/MOUSE.SYS) uses subfunction 06h to get
the mode table for mode 03h, and then looks for a signature string
beginning within 32 bytes of the offset specified by the word at
ES:000Ch
SeeAlso: AH=FFh"Oak"
Index: installation check;ATI video adapters

Bitfields for status flags:
Bit(s) Description (Table 0026)
3 set if enhanced features enabled
7-5 monitor type
000 PS/2 mono
001 PS/2 color
010 multi-sync
011 Taxan 650 25kHz
100 RGB
101 mono
110 EGA
111 Compaq internal

Format of ATI VGA Wonder video mode table:
Offset Size Description (Table 0027)
00h BYTE number of columns
01h BYTE maximum row (number of rows - 1)
02h BYTE scan lines per row
03h WORD video buffer size in bytes
05h 4 BYTEs values for Sequencer registers 1-4
09h BYTE value for Miscellaneous Output register
0Ah 25 BYTEs values for CRTC registers 00h-18h
00h horizontal total size (chars)
01h horizontal displayed (chars)
02h horizontal sync position (chars)
03h horizontal sync width (chars)
04h vertical total size (char rows)
05h vertical total adjust (scan lines)
06h vertical displayed (char rows)
07h vertical sync position (char rows)
08h interlace mode
09h max scan line in row
0Ah cursor start scan line
0Bh cursor end scan line
0Ch screen memory start (high)
0Dh screen memory start (low)
0Eh cursor address (high)
0Fh cursor address (low)
10h light pen (high)
11h light pen (low)
23h 20 BYTEs default palette (values for Attribute Controller regs 00h-13h)
37h 9 BYTEs values for Graphics Controller registers 00h-08h
--------V-1012--BL74-------------------------
INT 10 - Tseng ET-4000 BIOS v3.00 and v8.00 - BUG
AH = 12h
BL = 74h
Note: due to an omitted end-of-list marker, these versions of the BIOS will
crash the system on this function
--------V-1012--BL80-------------------------
INT 10 - Tseng ET-4000 BIOS v3.00 and v8.00 - BUG
AH = 12h
BL = 80h
Note: due to an omitted end-of-list marker, these versions of the BIOS will
crash the system on this function
--------V-1012--BL80-------------------------
INT 10 - Cirrus Logic BIOS - INQUIRE VGA TYPE
AH = 12h
BL = 80h
Return: AX = controller type in bits 13-0 (see #0028)
bit 14: ???
bit 15: ???
BL = silicon revision number (bit 7 set if not available)
SeeAlso: AH=12h/BL=81h,AH=12h/BL=82h,AH=12h/BL=85h,AH=12h/BL=9Ah,AH=12h/BL=A1h

(Table 0028)
Values for Cirrus Logic video controller type:
0000h no extended alternate select support
0002h 510/520
0003h 610/620
0004h 5320
0005h 6410
0006h 5410
0007h 6420
0008h 6412
0010h 5401
0011h 5402
0012h 5420
0013h 5422
0014h 5424
0015h 5426
0016h 5420r1
0017h 5402r1
0018h 5428
0020h 6205/15/25
0030h 5432
0031h 5434
--------V-1012--BL81-------------------------
INT 10 - Cirrus Logic BIOS - GET BIOS VERSION NUMBER
AH = 12h
BL = 81h
Return: AH = BIOS major version
AL = BIOS minor version
SeeAlso: AH=12h/BL=80h,AH=12h/BL=82h
--------V-1012--BL82-------------------------
INT 10 - Cirrus Logic BIOS - GET DESIGN REVISION CODE
AH = 12h
BL = 82h
Return: AL = chip revision
AH = ??? (AFh for v1.01)
SeeAlso: AH=12h/BL=80h,AH=12h/BL=81h
--------V-1012--BL84-------------------------
INT 10 - Cirrus Logic BIOS v3.02 - INQUIRE OPTIONS
AH = 12h
BL = 84h
Return: AX = user options word (see #0029)
SeeAlso: AH=12h/BL=89h,AH=12h/BL=8Ah,AH=12h/BL=8Bh,AH=12h/BL=8Ch,AH=12h/BL=8Fh
SeeAlso: AH=12h/BL=90h,AH=12h/BL=9Ah

Bitfields for Cirrus Logic user options word:
Bit(s) Description (Table 0029)
1,0 centering
00 vertical centered, 01 from bottom, 10 from top, 11 reserved
3,2 720-dot fix-up options
00 OR every 8th and 9th pixel
01 display MGA mode from left
10 display MGA mode from right
11 skip every 9th pixel
4 ???
7-5 video mode (001 CGA, 010 MGA, 011 EGA, 100 VGA)
8 external monitor enabled instead of LCD panel
9 vertical expand mode enabled
10 8-bit mode instead of 16-bit mode
11 normal video rather than reverse video (for LCD)
12 attribute automap rather than attribute emulation
13 bold mode disabled (default)
14 fast bandwidth
15 ???
--------V-1012--BL85-------------------------
INT 10 - Cirrus Logic BIOS - GET INSTALLED MEMORY
AH = 12h
BL = 85h
Return: AL = number of 64K banks of video memory
SeeAlso: AH=12h/BL=80h,AH=12h/BL=93h
--------V-1012--BL89-------------------------
INT 10 - Cirrus Logic BIOS v3.02 - LCD panel - EN/DISABLE REVERSE VIDEO MODE
AH = 12h
BL = 89h
AL = new state (00h enabled, 01h disabled)
SeeAlso: AH=12h/BL=84h,AH=12h/BL=8Ah,AH=12h/BL=8Bh
--------V-1012--BL8A-------------------------
INT 10 - Cirrus Logic BIOS v3.02 - LCD panel - SET FRAME COLOR
AH = 12h
BL = 8Ah
AL = new gray-scale color (00h = black to 0Fh = white)
SeeAlso: AH=12h/BL=84h,AH=12h/BL=89h,AH=12h/BL=8Fh
--------V-1012--BL8B-------------------------
INT 10 - Cirrus Logic BIOS v3.02 - LCD panel - ENABLE/DISABLE BOLD MODE
AH = 12h
BL = 8Bh
AL = new state (00h enabled, 01h disabled)
SeeAlso: AH=12h/BL=84h,AH=12h/BL=89h,AH=12h/BL=8Ch,AH=12h/BL=8Fh
--------V-1012--BL8C-------------------------
INT 10 - Cirrus Logic BIOS v3.02 - LCD panel - SET AUTOMAP/EMULATE ATTRIBUTES
AH = 12h
BL = 8Ch
AL = new state
00h enable automap
01h disable automap and emulate attributes
SeeAlso: AH=12h/BL=84h,AH=12h/BL=8Bh
--------V-1012--BL8F-------------------------
INT 10 - Cirrus Logic BIOS v3.02 - LCD panel - ENABLE/DISABLE EXPAND MODE
AH = 12h
BL = 8Fh
AL = new state (00h enabled, 01h disabled)
Note: when expand mode is enabled, the vertical dimension is enlarged to
full screen
SeeAlso: AH=12h/BL=84h,AH=12h/BL=89h,AH=12h/BL=8Bh,AH=12h/BL=90h
--------V-1012--BL90-------------------------
INT 10 - Cirrus Logic BIOS v3.02 - LCD panel - SET CENTERING MODE
AH = 12h
BL = 90h
AL = new position
00h centered
01h from top
02h from bottom
03h from top
SeeAlso: AH=12h/BL=84h,AH=12h/BL=8Fh
--------V-1012--BL91-------------------------
INT 10 - Cirrus Logic BIOS v3.02 - LCD panel - SET 720-DOT FIXUP MODE
AH = 12h
BL = 91h
AL = new mode
00h display MGA mode from left of screen (default)
01h display MGA from right
02h skip every ninth pixel
03h OR every 8th and 9th pixel
SeeAlso: AH=12h/BL=84h,AH=12h/BL=8Ah,AH=12h/BL=90h
--------V-1012--BL92-------------------------
INT 10 - Cirrus Logic BIOS v3.02 - LCD panel - SWITCH DISPLAY
AH = 12h
BL = 92h
AL = new display (00h LCD, 01h external monitor)
Note: the deselected display is disabled
SeeAlso: AH=12h/BL=84h,AH=12h/BL=89h,AH=12h/BL=90h,AH=12h/BL=94h
--------V-1012--BL93-------------------------
INT 10 - Cirrus Logic BIOS - FORCE 8-BIT OR 16-BIT OPERATION
AH = 12h
BL = 93h
AL = new I/O width (00h = 16 bits, 01h = 8 bits)
SeeAlso: AH=12h/BL=9Ah
--------V-1012--BL94-------------------------
INT 10 - Cirrus Logic BIOS v3.02 - POWER CONSERVATION
AH = 12h
BL = 94h
AL = new state (00h wake up monitor, 01h shut down display)
Note: AL=01h is reported not to work properly on the LCD panel
SeeAlso: AH=12h/BL=84h,AH=12h/BL=92h
--------V-1012--BL9A-------------------------
INT 10 - Cirrus Logic BIOS - GET USER OPTIONS
AH = 12h
BL = 9Ah
Return: AX = options word 1 (see #0030)
CX = options word 2 (see #0031)
SeeAlso: AH=12h/BL=80h,AH=12h/BL=84h,AH=12h/BL=93h,AH=12h/BL=A0h
SeeAlso: AH=12h/BL=A3h,AH=12h/BL=A4h

Bitfields for Cirrus Logic options word 1:
Bit(s) Description (Table 0030)
0,1 reserved
2-4 monitor type
5-6 maximum vertical resolution
7-9 reserved
10 force 8-bit operation
11-13 reserved
14 vertical refresh frequency at 640x480
15 reserved

Bitfields for Cirrus Logic options word 2:
Bit(s) Description (Table 0031)
0-3 reserved
4-5 vertical refresh frequency at 1280x1024
6-10 reserved
11-12 vertical refresh frequency at 800x600
13-15 vertical refresh frequency at 1024x768
--------V-1012--BLA0-------------------------
INT 10 - Cirrus Logic BIOS - GET VIDEO MODE AVAILABILITY
AH = 12h
BL = A0h
AL = video mode number (00h-7Fh)
Return: AH bit 0: video mode supported
BX = offset of BIOS subroutine to fixup standard video parameters
(call subroutine with DS:SI and ES:DI as returned by this call)
DS:SI -> standard video parameters or FFFFh:FFFFh
ES:DI -> supplemental video parameters or FFFFh:FFFFh
SeeAlso: AH=00h,AH=12h/BL=9Ah,AH=12h/BL=A1h
--------V-1012--BLA1-------------------------
INT 10 - Cirrus Logic BIOS - READ MONITOR TYPE AND ID FROM 15-PIN CONNECTOR
AH = 12h
BL = A1h
Return: BH = monitor ID (see #0032)
BL = monitor type (00h color, 01h grayscale, 02h no display)
SeeAlso: AH=12h/BL=9Ah,AH=12h/BL=A2h

(Table 0032)
Values for Cirrus Logic monitor ID:
00h-08h reserved
09h IBM 8604/8507 or equivalent
0Ah IBM 8514 or equivalent
0Bh IBM 8515 or equivalent
0Dh IBM 8503 or equivalent
0Eh IBM 8512/8513 or equivalent
0Fh no monitor
--------V-1012--BLA2-------------------------
INT 10 - Cirrus Logic BIOS - SET MONITOR HORIZONTAL RETRACE FREQUENCY
AH = 12h
BL = A2h
AL = retrace rate
00h standard VGA (31.5 kHz)
01h 8514-compatible (31.5 kHz and 35.5 kHz interlaced)
02h SuperVGA (31.5-35.1 kHz)
03h extended SuperVGA (31.5-35.5 kHz)
04h multi-frequency (31.5-37.8 kHz)
05h extended multi-frequency (31.5-48.0 kHz)
06h super multi-frequency (31.5-56.0 kHz)
07h extended super multi-frequency (31.5-64.0 kHz)
SeeAlso: AH=12h/BL=9Ah,AH=12h/BL=A0h,AH=12h/BL=A4h
--------V-1012--BLA3-------------------------
INT 10 - Cirrus Logic BIOS - SET VGA REFRESH
AH = 12h
BL = A3h
AL = refresh rate for 640x480 (00h normal, 01h high)
SeeAlso: AH=12h/BL=9Ah,AH=12h/BL=A4h
--------V-1012--BLA4-------------------------
INT 10 - Cirrus Logic BIOS - SET MONITOR TYPE
AH = 12h
BL = A4h
AL bits 3-0 = maximum vertical resolution
(0 = 480 scanlines, 1 = 600, 2 = 768, 3 = 1024, other reserved)
AL bits 7-4 = vertical refresh at 640x480
(0 = 60Hz, 1 = 72Hz, other reserved)
BH bits 3-0 = vertical refresh at 800x600
(0 = 56Hz, 1 = 60Hz, 2 = 72Hz, other reserved)
BH bits 7-4 = vertical refresh at 1024x768
(0=87Hz-int, 1=60Hz, 2=70Hz, 3=72Hz, 4=76Hz, other reserved)
CH bits 4-7 = vertical refresh at 1280x1024
(0=87Hz-int, 1=60Hz, 2=70Hz, other reserved)
SeeAlso: AH=12h/BL=9Ah,AH=12h/BL=A3h
--------V-1012--BLBE-------------------------
INT 10 - Tseng ET-4000 BIOS v3.00 and v8.00 - BUG
AH = 12h
BL = BEh
Note: due to an omitted end-of-list marker, these versions of the BIOS will
crash the system on this function
--------V-1012--BLC6-------------------------
INT 10 - Tseng ET-4000 BIOS v3.00 and v8.00 - BUG
AH = 12h
BL = C6h
Note: due to an omitted end-of-list marker, these versions of the BIOS will
crash the system on this function
--------V-1012--BLF0-------------------------
INT 10 - Tseng ET-4000 BIOS v3.00 and v8.00 - BUG
AH = 12h
BL = F0h
Note: due to an omitted end-of-list marker, these versions of the BIOS will
crash the system on this function
--------V-1013-------------------------------
INT 10 - VIDEO - WRITE STRING (AT and later,EGA)
AH = 13h
AL = write mode
bit 0: update cursor after writing
bit 1: string contains alternating characters and attributes
bits 2-7: reserved (0)
BH = page number
BL = attribute if string contains only characters
CX = number of characters in string
DH,DL = row,column at which to start writing
ES:BP -> string to write
Notes: recognizes CR, LF, BS, and bell; for the ET4000 BIOS, scrolling,
backspace, and CR only take place in the active page
also available PC or XT with EGA or higher
HP 95LX only supports write mode 00h
BUG: on the IBM VGA Adapter, any scrolling which may occur is performed on
the active page rather than the requested page
SeeAlso: AH=09h,AH=0Ah,AH=13h"DOS/V"
--------J-1013-------------------------------
INT 10 - DOS/V - READ/WRITE DOUBLE-BYTE CHARACTER SET CHARACTERS/ATTRIBUTES
AH = 13h
AL = function
10h read characters and standard attributes
11h read characters and extended attributes
12h write characters and standard attributes
13h write characters and extended attributes
BH = 00h
CX = number of characters to transfer
DH,DL = row,column at which to start transfer
ES:BP -> buffer for/containing characters and attributes (see #0033)
Return: ES:BP buffer filled if reading
Program: DOS/V is a Japanese-language version of MS-DOS which can run on
standard (non-Japanese) ATs and compatible equipped with a VGA or
newer video adapter
Notes: subfunctions 11h and 13h are only valid when DOS/V is using video
mode 73h
the cursor position is not changed by these functions
extended attributes consist of three bytes; the first is the standard
character attribute byte, the second is as described below, and the
third is always zero in current versions
SeeAlso: AH=00h,AH=13h"VIDEO"

Bitfields for DOS/V second extended attribute byte:
Bit(s) Description (Table 0033)
7 underline using foreground color
6 reverse foreground/background specified in standard attribute byte
5-4 unused
3 vertical white grid line in cell
2 horizontal white grid line in cell
1-0 unused
SeeAlso: #0013,#0025
--------V-101400-----------------------------
INT 10 - VIDEO - LOAD USER-SPECIFIED LCD CHARACTER FONT (CONV,Compaq Port 386)
AX = 1400h
ES:DI -> character font
BH = number of bytes per character
08h or 10h (Compaq)
BL = 00h load main font (block 0)
01h load alternate font (block 1)
CX = number of characters to store
DX = character offset into RAM font area
SeeAlso: AH=11h,AX=1401h
--------V-101401-----------------------------
INT 10 - VIDEO - LOAD SYSTEM ROM DEFAULT LCD CHARACTER FONT (CONV,CP386)
AX = 1401h
BL = font to load
00h main font (block 0)
01h alternate font (block 1)
SeeAlso: AH=11h,AX=1400h
--------V-101402-----------------------------
INT 10 - VIDEO - SET MAPPING OF LCD HIGH INTENSITY ATTRIBUTES (CONV,CP386)
AX = 1402h
BL = function
00h ignore high intensity attribute
01h map high intensity to reverse video
02h map high intensity to underscore
03h map high intensity to selected alternate font
B0h half intensity (Compaq)
B1h toggle active intensity bit interpretation (CP386)
--------V-1015-------------------------------
INT 10 - VIDEO - GET PHYSICAL DISPLAY PARAMETERS (CONVERTIBLE)
AH = 15h
Return: AX = alternate display adapter type (see #0034)
ES:DI -> parameter table (see #0035)
SeeAlso: AH=1Bh

(Table 0034)
Values for PC Convertible alternate display adapter type:
0000h none
5140h LCD
5153h CGA
5151h mono

Format of PC Convertible display parameter table:
Offset Size Description (Table 0035)
00h WORD monitor model number
02h WORD vertical pixels per meter
04h WORD horizontal pixels per meter
06h WORD total vertical pixels
08h WORD total horizontal pixels
0Ah WORD horizontal pixel separation in micrometers
(width, center-to-center)
0Ch WORD vertical pixel separation in micrometers
(height, center-to-center)
--------V-1015-------------------------------
INT 10 - VIDEO - SET SUPERIMPOSE MODE (Sperry PC)
AH = 15h
AL = superimpose mode
00h show graphics screen
01h show text screen
02h show text screen superimposed on graphics screen
--------J-1018-------------------------------
INT 10 - VIDEO - DOS/V - GET/SET FONT PATTERN
AH = 18h
AL = function
00h get font pattern
01h set font pattern
BX = 0000h
CL = character size in bytes (01h,02h)
CH = 00h
DH = character width in pixels
DL = character height in pixels
ES:DI -> buffer for/containing font image
Return: AL = status (00h successful, else error)
ES:DI buffer filled for function 00h if successful
Note: the supported font sizes are 8x16 single-byte, 8x19 single-byte,
16x16 double-byte, and 24x24 double-byte
SeeAlso: AH=19h,INT 16/AH=14h
--------V-1019-------------------------------
INT 10 - Japanese VIDEO - DOUBLE-BYTE CHARACTER SET SHIFT INFORMATION
AH = 19h
???
Return: ???
SeeAlso: AH=18h,INT 16/AH=14h
--------V-101A00-----------------------------
INT 10 - VIDEO - GET DISPLAY COMBINATION CODE (PS,VGA/MCGA)
AX = 1A00h
Return: AL = 1Ah if function was supported
BL = active display code (see #0036)
BH = alternate display code (see #0036)
Notes: this function is commonly used to check for the presence of a VGA
this function is supported on the ATI EGA Wonder with certain
undocumented configuration switch settings, even though the EGA
Wonder does not support VGA graphics; to distinguish this case,
call AX=1C00h with CX nonzero, which the EGA Wonder does not support
SeeAlso: AH=12h/BL=35h,AX=1A01h,AH=1Bh
Index: installation check;VGA

(Table 0036)
Values for display combination code:
00h no display
01h monochrome adapter w/ monochrome display
02h CGA w/ color display
03h reserved
04h EGA w/ color display
05h EGA w/ monochrome display
06h PGA w/ color display
07h VGA w/ monochrome analog display
08h VGA w/ color analog display
09h reserved
0Ah MCGA w/ digital color display
0Bh MCGA w/ monochrome analog display
0Ch MCGA w/ color analog display
FFh unknown display type
--------V-101A01-----------------------------
INT 10 - VIDEO - SET DISPLAY COMBINATION CODE (PS,VGA/MCGA)
AX = 1A01h
BL = active display code (see #0036)
BH = alternate display code
Return: AL = 1Ah if function was supported
SeeAlso: AH=12h/BL=35h,AX=1A00h
--------V-101B-------------------------------
INT 10 - VIDEO - FUNCTIONALITY/STATE INFORMATION (PS,VGA/MCGA)
AH = 1Bh
BX = implementation type
0000h return funtionality/state information
ES:DI -> 64-byte buffer for state information (see #0037)
Return: AL = 1Bh if function supported
ES:DI buffer filled with state information
BUG: Trident 8900 (BIOS D3.0 11/12/91) and Trident 9000 (C3.0 10/25/91)
do not correctly set the fields at offsets 27h and 29h of the
state information
SeeAlso: AH=15h,AX=1A00h,AX=1F01h

Format of MCGA+ state information:
Offset Size Description (Table 0037)
00h DWORD address of static funtionality table (see #0040)
04h BYTE video mode in effect
05h WORD number of columns
07h WORD length of regen buffer in bytes
09h WORD starting address of regen buffer
0Bh WORD cursor position for page 0
0Dh WORD cursor position for page 1
0Fh WORD cursor position for page 2
11h WORD cursor position for page 3
13h WORD cursor position for page 4
15h WORD cursor position for page 5
17h WORD cursor position for page 6
19h WORD cursor position for page 7
1Bh WORD cursor "type" (start/stop scan lines)
1Dh BYTE active display page
1Eh WORD CRTC port address
20h BYTE current setting of register (3?8)
21h BYTE current setting of register (3?9)
22h BYTE number of rows - 1
23h WORD bytes/character
25h BYTE display combination code of active display
26h BYTE DCC of alternate display
27h WORD number of colors supported in current mode (0000h = mono)
29h BYTE number of pages supported in current mode
2Ah BYTE number of scan lines active
(0,1,2,3) = (200,350,400,480)
Tseng ET3000: (4,5,6 = 512,600,768)
2Bh BYTE primary character block
2Ch BYTE secondary character block
2Dh BYTE miscellaneous flags (see #0038)
2Eh 3 BYTEs reserved (00h)
31h BYTE video memory available
00h = 64K, 01h = 128K, 02h = 192K, 03h = 256K
32h BYTE save pointer state flags (see #0039)
33h 13 BYTEs reserved (00h)

Bitfields for miscellaneous flags:
Bit(s) Description (Table 0038)
0 all modes on all displays on
1 gray summing on
2 monochrome display attached
3 default palette loading disabled
4 cursor emulation enabled
5 0 = intensity; 1 = blinking
6 PS/2 P70 plasma display (without 9-dot wide font) active
7 unused (0)

Bitfields for save pointer state flags:
Bit(s) Description (Table 0039)
0 512 character set active
1 dynamic save area present
2 alpha font override active
3 graphics font override active
4 palette override active
5 DCC override active
6-7 unused (0)

Format of Static Functionality Table:
Offset Size Description (Table 0040)
00h BYTE modes supported 1
bit 0 to bit 7 = 1 modes 0,1,2,3,4,5,6,7 supported
01h BYTE modes supported 2
bit 0 to bit 7 = 1 modes 8,9,0Ah,0Bh,0Ch,0Dh,0Eh,0Fh supported
02h BYTE modes supported 3
bit 0 to bit 3 = 1 modes 10h,11h,12h,13h supported
bit 4 to bit 7 unused (0)
03h BYTE (IBM) reserved
(Tseng ET3000/4000) modes supported 4
bit 0 to bit 7 = modes 18h-1Fh supported
04h BYTE (IBM) reserved
(Tseng ET3000/4000) modes supported 5
bit 0 to bit 7 = modes 20h-27h supported
05h BYTE (IBM) reserved
(Tseng ET3000/4000) modes supported 6
bit 0 to bit 7 = modes 28h-2Fh supported
06h BYTE (IBM) reserved
(Tseng ET3000/4000) modes supported 7
bit 0 to bit 7 = modes 30h-37h supported
07h BYTE scan lines supported
bit 0 to bit 2 = 1 if scan lines 200,350,400 supported
bits 3-7 = unused (0)
08h BYTE total number of character blocks available in text modes
09h BYTE maximum number of active character blocks in text modes
0Ah WORD miscellaneous function support flags (see #0041)
0Ch WORD reserved
0Eh BYTE save pointer function flags (see #0042)
0Fh BYTE reserved

Bitfields for miscellaneous function support flags:
Bit(s) Description (Table 0041)
0 all modes on all displays function supported
1 gray summing function supported
2 character font loading function supported
3 default palette loading enable/disable supported
4 cursor emulation function supported
5 EGA palette present
6 color palette present
7 color-register paging function supported
8 light pen supported (see AH=04h)
9 save/restore state function 1Ch supported
10 intensity/blinking function supported (see AX=1003h)
11 Display Combination Code supported (see #0036)
12-15 unused (0)

Bitfields for save pointer function flags:
Bit(s) Description (Table 0042)
0 512 character set supported
1 dynamic save area supported
2 alpha font override supported
3 graphics font override supported
4 palette override supported
5 DCC extension supported
6-7 unused (0)
--------V-101C-------------------------------
INT 10 - VIDEO - SAVE/RESTORE VIDEO STATE (PS50+,VGA)
AH = 1Ch
AL = function
00h return state buffer size
Return: BX = number of 64-byte blocks needed
01h save video state
ES:BX -> buffer
02h restore video state
ES:BX -> buffer containing previously saved state
CX = requested states (see #0043)
Return: AL = 1Ch if function supported
Notes: many BIOSes corrupt the video registers when saving the state, so a
program should restore the state immediately after saving it (the
saved data is uncorrupted)
the BIOS data area consists of the 96 bytes from 0040h:0049h-00A8h
this function is not supported when DOS/V is running

Bitfields for requested states:
Bit(s) Description (Table 0043)
0 video hardware (see #0044)
1 BIOS data areas
2 color registers and DAC state (see #0045)
3-15 unused (0)

Format of VGA video hardware state:
Offset Size Description (Table 0044)
00h BYTE sequencer index register
01h BYTE CRTC index register
02h BYTE graphics controller index register
03h BYTE attribute controller index register
04h BYTE feature controller register
05h 4 BYTEs sequencer registers
09h BYTE sequencer register 0
0Ah 25 BYTEs CRTC registers 0-8
23h 16 BYTEs palette registers 00h-0Fh
33h 4 BYTEs attribute registers 10h-13h
37h 9 BYTEs graphics controller registers 0-8
40h BYTE CRTC base address (low)
41h BYTE CRTC base address (high)
42h BYTE plane 0 latch
43h BYTE plane 1 latch
44h BYTE plane 2 latch
45h BYTE plane 3 latch

Format of VGA DAC state:
Offset Size Description (Table 0045)
00h BYTE read/write mode DAC
01h BYTE pixel address
02h BYTE pixel mask
03h 768 BYTEs color data (256 triples)
303h BYTE color select register
--------J-101D-------------------------------
INT 10 - VIDEO - DOS/V - SHIFT STATUS LINE CONTROL
AH = 1Dh
AL = function
00h enable shift status line(s)
BX = number of lines to reserve at bottom of screen (usu. 1)
01h disable shift status line
BX = number of lines reserved at bottom of screen (usually 1)
02h get number of status lines
Return: BX = number of lines reserved for shift status
SeeAlso: AH=19h
--------V-101D-------------------------------
INT 10 - SpeedSTAR Plus BIOS v4.23+ - SET SYNC PARAMETERS
AH = 1Dh
AL = video mode
ES = caller's segment
Return: nothing
Note: the caller's segment contains at offset 5Ch (FCB field in PSP)
or 100h a table with sync parameters (see #0046) (BIOS looks at both
offsets)

Format of SpeedSTAR Plus sync table:
Offset Size Description (Table 0046)
00h 9 BYTEs ID contains string 'ey5CENTER'
09h 5 BYTEs sync parameters for 640x480 modes 11h,12h,25h,26h,2Eh
0Bh 5 BYTEs sync parameters for 800x600 modes 29h,30h,2Ah
13h 5 BYTEs sync parameters for 1024x768 modes 37h,38h
--------V-101D-------------------------------
INT 10 - Tseng ET-4000 BIOS v3.00 and v8.00 - BUG
AH = 1Dh
Note: these versions of the BIOS jump to a random location on this function
due to a fencepost error
--------V-101F00-----------------------------
INT 10 - VIDEO - XGA - GET DMQS (Display Mode Query and Set) DATA LENGTH
AX = 1F00h
Return: AL = 1Fh if supported
BX = number of bytes of DMQS data
Note: not supported on the original IBM XGA, only on XGA-NI (non-interlaced)
and later models.
SeeAlso: AX=1F01h
--------V-101F01-----------------------------
INT 10 - VIDEO - XGA - READ DMQS DATA
AX = 1F01h
ES:DI -> user buffer for return data (call AX=1F00h for size)
Return: AL = 1Fh if function supported
user buffer filled with DMQS data (see #0047)
Note: not supported on the original IBM XGA, only on XGA-NI (non-interlaced)
and later models.
SeeAlso: AH=1Bh,AX=1F00h,AX=3000h

Format of XGA DMQS buffer:
Offset Size Description (Table 0047)
00h WORD offset (in bytes) to DMQS data for next XGA instance
02h BYTE slot number
03h BYTE XGA implementation function level identifier
04h BYTE XGA implementation resolution level identifier
05h WORD vendor identifier - identifies card vendor
07h WORD vendor defined field
09h WORD XGA adapter I/O register base address
0Bh WORD XGA coprocessor register base address
(paragraph--multiply by 10h to get physical address)
0Dh WORD 1 Megabyte system video memory aperture
0000h if not allocated
(Multiply by 100000h to get physical address)
0Fh WORD 4 Megabyte system video memory aperture
0000h if not allocated
(multiply by 100000h to get physical address)
11h WORD video memory base address
(multiply by 100000h to get physical address)
13h WORD composite ID of the attached display
15h BYTE amount of video memory available, in multiples of 256K bytes
16h DWORD alternate XGA coprocessor register base address. 0 = none.
1Ah var DMQS Data for further XGA Instances (as above)
Note: "Instances" refers to the capability of having up to 8 XGA
adapters in one computer.
--------V-103000CX0000-----------------------
INT 10 - VIDEO - LOCATE 3270PC CONFIGURATION TABLE (INSTALLATION CHECK)
AX = 3000h
CX = 0000h
DX = 0000h
Return: CX:DX -> 3270PC configuration table (see #0048)
CX:DX = 0000h:0000h if 3270PC Control Program not active
SeeAlso: AX=1F01h

Format of 3270 PC configuration table:
Offset Size Description (Table 0048)
00h BYTE aspect ratio X
01h BYTE aspect ratio Y
02h BYTE monitor type (see #0049)
03h BYTE reserved
04h BYTE adapter ID
00h = 5151/5272 adapter
04h = 5151/5272 with XGA adapter
30h = 3295 or 3270PC G/GX adapter
05h BYTE reserved
06h BYTE function flags 1 (see #0050)
07h BYTE function flags 2
bit 6: GPI graphics supported
08h WORD segment address of Control Program Level table (see #0051)
0Ah 10 BYTEs reserved

(Table 0049)
Values for 3270 PC monitor type:
00h 5151 (mono) or 5272 (color)
01h 3295
02h 5151 or 5272 with XGA (???) graphics adapter
03h 5279 with 3270PC G adapter
04h 5379 model C01 with 3270PC GX adapter
05h 5379 model M01 with 3270PC GX adapter
07h non-3270PC with 3270 Workstation Program
FFh 3270PC Control Program not loaded

Bitfields for 3270 PC function flags 1:
Bit(s) Description (Table 0050)
7 mono text, 1 page
6 color text, 1 page
5 color text, 4 pages
4 CGA color graphics
3 720x350 two-color graphics
2 360x350 four-color graphics
1 720x350 eight-color graphics

Format of Control Program Level table:
Offset Size Description (Table 0051)
00h WORD program version
02xxh = 3270PC Control Program v2.xx
03xxh = 3270PC Control Program v3.xx
04xxh = 3270 Workstation Program v1.xx
02h BYTE Control Program ID (00h)
03h 27 BYTEs Control Program Descriptor ("IBM 3270 PC CONTROL PROGRAM")
--------a-103800-----------------------------
INT 10 - Tinytalk Personal v1.09f+ - GET CONFIGURATION INFO
AX = 3800h
Return: ES:DI -> configuration info (see #0052)
Program: Tinytalk is a shareware screen reader by OMS Development/Eric Bohlman
Notes: this call is also used as the installation check by verifying that the
returned ES:DI points at valid configuration info
Tinytalk v1.09f ignores AL and always returns the configuration info;
v1.10 adds several subfunctions selected with AL
SeeAlso: AX=3801h,AX=3803h,AX=3806h,AH=39h,INT 14/AX=F0F1h
SeeAlso: INT 2F/FB00h"AutoBraille"
Index: installation check;Tinytalk Personal

Format of Tinytalk Personal configuration info:
Offset Size Description (Table 0052)
00h 8 BYTEs signature "TTCONFIG"
08h WORD size of configuration data, not counting signature, this WORD,
or the following byte
0Ah BYTE ???
0Bh ??? configuration data
--------a-103801-----------------------------
INT 10 - Tinytalk Personal v1.10 - ???
AX = 3801h
DL = ???
Return: ???
SeeAlso: AX=3800h,AX=3802h
--------a-103802-----------------------------
INT 10 - Tinytalk Personal v1.10 - ???
AX = 3802h
DL = ???
Return: ???
SeeAlso: AX=3800h,AX=3801h
--------a-103803-----------------------------
INT 10 - Tinytalk Personal v1.10 - GET ???
AX = 3803h
Return: AL = ???
SeeAlso: AX=3800h,AX=3804h,AX=3805h
--------a-103804-----------------------------
INT 10 - Tinytalk Personal v1.10 - GET ???
AX = 3804h
Return: AX = ???
SeeAlso: AX=3800h,AX=3803h,AX=3805h
--------a-103805-----------------------------
INT 10 - Tinytalk Personal v1.10 - GET ???
AX = 3805h
Return: AL = ???
SeeAlso: AX=3800h,AX=3803h,AX=3804h
--------a-103806-----------------------------
INT 10 - Tinytalk Personal v1.10 - ???
AX = 3806h
ES:DX -> ASCIZ ???
Return: ???
SeeAlso: AX=3800h
--------a-1039-------------------------------
INT 10 - Tinytalk Personal v1.10 - ???
AH = 39h
Program: Tinytalk is a shareware screen reader by OMS Development/Eric Bohlman
Note: this function was a NOP in TTDEMO.EXE, but may be implemented in other
variants of Tinytalk
--------V-1040-------------------------------
INT 10 - VIDEO - SET GRAPHICS MODE (Hercules GRAFIX)
AH = 40h
Desc: switch the Hercules Graphics Card into graphics mode (720x348)
SeeAlso: AH=00h,AH=41h
Index: video modes;Hercules
--------V-1041-------------------------------
INT 10 - VIDEO - SET TEXT MODE (Hercules GRAFIX)
AH = 41h
Desc: switch the Hercules Graphics Card into text mode
SeeAlso: AH=00h,AH=40h
Index: video modes;Hercules
--------V-1042-------------------------------
INT 10 - VIDEO - CLEAR CURRENT PAGE (Hercules GRAFIX)
AH = 42h
SeeAlso: AH=45h
--------V-1043-------------------------------
INT 10 - VIDEO - SELECT DRAWING PAGE (Hercules GRAFIX)
AH = 43h
AL = page number (0,1)
Desc: specify which of the two pages of video memory is to be used for
output
SeeAlso: AH=05h,AH=44h,AH=45h
--------V-1044-------------------------------
INT 10 - VIDEO - SELECT DRAWING FUNCTION (Hercules GRAFIX)
AH = 44h
AL = drawing function
00h clear pixels
01h set pixels
02h invert pixels
Desc: specify how graphics output will change the display
SeeAlso: AH=45h,AH=46h,AH=4Ch,AH=4Dh
--------V-1045-------------------------------
INT 10 - VIDEO - SELECT PAGE TO DISPLAY (Hercules GRAFIX)
AH = 45h
AL = page number (0,1)
Desc: specify which of the two pages of video memory is visible on screen
SeeAlso: AH=05h,AH=42h,AH=43h
--------V-1046-------------------------------
INT 10 - VIDEO - DRAW ONE PIXEL (Hercules GRAFIX)
AH = 46h
DI = x (0-719)
BP = y (0-347)
Note: function 44h determines operation and function 43h which page to use
SeeAlso: AH=0Ch,AH=47h,AH=49h,AH=4Ch,AH=4Dh
--------V-1047-------------------------------
INT 10 - VIDEO - FIND PIXEL VALUE (Hercules GRAFIX)
AH = 47h
DI = x (0-719)
BP = y (0-347)
Return: AL = 00h pixel clear
AL = 01h pixel set
Note: function 43h specifies which page is used
SeeAlso: AH=0Dh,AH=46h
--------V-1048-------------------------------
INT 10 - VIDEO - MOVE TO POINT (Hercules GRAFIX)
AH = 48h
DI = x (0-719)
BP = y (0-347)
Desc: specify the location from which to start the next graphics output
SeeAlso: AH=49h
--------V-1049-------------------------------
INT 10 - VIDEO - DRAW TO POINT (Hercules GRAFIX)
AH = 49h
DI = x (0-719)
BP = y (0-347)
Note: function 48h or 49h specify first point, 44h operation and 43h page to
use
SeeAlso: AH=43h,AH=44h,AH=48h,AH=4Ch,AH=4Dh
--------V-104A-------------------------------
INT 10 - VIDEO - BLOCK FILL (Hercules GRAFIX)
AH = 4Ah
DI = x coordinate of lower left corner
BP = y coordinate of lower left corner
BX = height in pixels
CX = width in pixels
Desc: draw a solid rectangle of the specified size at the given location
SeeAlso: AH=4Eh
--------V-104B-------------------------------
INT 10 - VIDEO - DISPLAY CHARACTER (Hercules GRAFIX)
AH = 4Bh
AL = character to display
DI = x (0-719)
BP = y (0-347)
Note: unlike the other BIOS character functions character position is
specified in pixels rather than rows and columns
SeeAlso: AH=09h,AH=0Ah
----------104B-------------------------------
INT 10 - FRIEZE - API
AH = 4Bh
CL = function
00h (v6.x-) print window
AL = mode
00h character
01h normal
02h sideways
01h load window
ES:BX -> ASCIZ filename from which to read
02h save window
ES:BX -> ASCIZ filename to which to write
03h set print width
AL = width in 1/4 inches
04h set print height
AL = height in 1/4 inches
05h reserved
06h set left margin
AL = printout margin in 1/4 inches
07h set window size
ES:BX -> four-WORD structure with Xmin, Ymin, Xmax, Ymax
08h reserved
09h set patterns
ES:BX -> 16-BYTE vector of screen->printer color correspondnces
0Ah get patterns
ES:BX -> 16-BYTE buffer for color correspondences
0Bh set mode
AL = mode
0Ch (v7.41) ???
AL = ???
00h ??? (calls original INT 05)
else ???
0Dh (v7.41) ???
AL = ???
00h ??? (calls original INT 05)
else ???
0Eh (v7.41) ???
???
0Fh get window
ES:BX -> four-WORD buffer for Xmin, Ymin, Xmax, Ymax
10h set print options
ES:BX -> printer options in same format as FRIEZE cmdline
11h initialize
ES:BX -> three-WORD array from CARDS.DAT for HRes, VRes, code
12h (v7.41) ???
???
13h (v7.41) ???
???
14h get version
Return: AH = major version (00h if FRIEZE version before 7)
AL = minor version
15h set parameters
ES:BX -> parameter table (see #0054)
16h get parameters
ES:BX -> buffer for parameter table (see #0054)
17h get printer resolution
ES:BX -> 12-WORD table for six horizontal/vertical resol pairs
18h (v8.0 only) reserved
50h (v7.41) get ???
Return: AX = ???
51h (v7.41) get ???
Return: ES = ??? (seen 2348h)
AX = ??? (seen 8432h)
Return: AX = status (see #0053)
SeeAlso: AH=0Fh/SI=F123h

(Table 0053)
Values for FRIEZE function status:
00h successful
01h user aborted printout with ESC
02h reserved
03h file read error
04h file write error or printer error
05h file not found
06h invalid header (not an image or wrong screen mode) or can't create file
07h file close error
08h disk error
09h (v7.0+) printer error
0Ah invalid function
0Bh (v7.0+) can't create file
0Ch (v7.0+) wrong video mode

Format of FRIEZE parameter table:
Offset Size Description (Table 0054)
00h WORD top margin (1/100 inch)
02h WORD left margin (1/100 inch)
04h WORD horizontal size (1/100 inch)
06h WORD vertical size (1/100 inch)
08h WORD quality/draft mode
00h draft mode
01h quality mode
02h use horizontal/vertical resolution for output resolution
0Ah WORD printer horizontal resolution (dots per inch)
0Ch WORD printer vertical resolution (dots per inch)
0Eh WORD reserved (FFFFh)
Note: any field which should remain unchanged may be filled with FFFFh
--------V-104C-------------------------------
INT 10 - VIDEO - DRAW ARC (Hercules GRAFIX)
AH = 4Ch
AL = quadrant (1 = upper right, 2 = upper left, etc)
DI = x coordinate of center
BP = y coordinate of center
BX = radius
SeeAlso: AH=49h,AH=4Dh
--------V-104D-------------------------------
INT 10 - VIDEO - DRAW CIRCLE (Hercules GRAFIX)
AH = 4Dh
DI = x of center
BP = y of center
BX = radius
SeeAlso: AH=49h,AH=4Ch
--------V-104E-------------------------------
INT 10 - VIDEO - FILL AREA (Hercules GRAFIX)
AH = 4Eh
DI = x coordinate of an interior point
BP = y coordinate of an interior point
Desc: fill a convex polygonal area bounded by a contiguous line of the

opposite color with the border color
Note: the first fill makes the figure solid, the second erases it
SeeAlso: AH=4Ah
--------V-104E00-----------------------------
INT 10 - VESA XGA BIOS Extensions - GET XGA ENVIRONMENT INFORMATION
AX = 4E00h
ES:DI -> 256-byte buffer for XGA information (see #0055)
Return: AL = 4Eh if function supported
AH = status
00h successful
else error code
Desc: determine whether VESA XGA extensions are present and the capabilities
supported by the display adapter
SeeAlso: AX=4E01h,AX=4E02h,AX=4F00h
Index: installation check;VESA XGA

Format of XGA information buffer:
Offset Size Description (Table 0055)
00h 4 BYTEs signature ("VESA")
04h WORD VESA version number
06h DWORD pointer to ASCIZ OEM string
0Ah DWORD environment flags (see #0056)
0Eh WORD number of XGA adapters installed (other VESA XGA functions
require a handle indicating which adapter to use)
10h 240 BYTEs reserved

Bitfields for XGA environment flags:
Bit(s) Description (Table 0056)
0-1 system bus (00 = MCA, 01 = ISA, 10 = EISA)
2 bus mastering available
3-31 reserved
--------V-104E01----------------------------
INT 10 - VESA XGA BIOS Extensions - RETURN XGA SUBSYSTEM INFORMATION
AX = 4E01h
DX = XGA handle (0 to number of XGAs-1)
ES:DI -> 256-byte buffer for subsystem information (see #0057)
Return: AL = 4Eh if function supported
AH = status
00h function successful
else error code
SeeAlso: AX=4E00h,AX=4E02h

Format of XGA subsystem information:
Offset Size Description (Table 0057)
00h DWORD pointer to null-terminated board OEM string
04h DWORD capabilities (see #0058)
08h DWORD pointer to 8KB XGA ROM (or NULL)
0Ch DWORD pointer to the XGA memory mapped registers
10h WORD base address of XGA I/O registers (21x0h)
12h DWORD pointer to start of physical video memory
(A000h:0000h or B000h:0000h)
16h DWORD physical address of 4MB aperture (or NULL if none)
1Ah DWORD physical address of 1MB aperture (or NULL if none)
1Eh DWORD physical address of 64KB aperture (or NULL if not enabled)
22h DWORD physical address of OEM aperture (or NULL if none)
26h WORD size of OEM aperture in 64KByte units
28h DWORD pointer to list of video modes
The list is a series of WORDs terminated by FFFFh
2Ch WORD number of 64KB blocks on the board
2Eh DWORD XGA manufacturer ID
byte 0 POS data index 1
byte 1 is index 2
byte 2 is 21xAh index 75h
32h 206 BYTEs reserved

Bitfields for XGA capabilities:
Bit(s) Description (Table 0058)
0-1 board bus architecture: 0=MCA, 1=ISA, 3=EISA
2-3 reserved
4-6 DMA Channel assigned for acquiring bus mastership (only for ISA bus)
7 DMA Channel Status (ISA only). enabled if set
8-31 reserved
--------V-104E02-----------------------------------
INT 10 - VESA XGA BIOS Extensions - RETURN XGA MODE INFORMATION
AX = 4E02h
CX = Video mode
DX = XGA handle
ES:DI -> 256 byte buffer for mode information (see #0059)
Return: AL = 4Eh if function supported
AH = status
00h function successful
else error code
SeeAlso: AX=4E00h,AX=4E01h

Format of XGA mode information:
Offset Size Description (Table 0059)
00h WORD attributes of the mode (see #0060)
02h WORD bytes per logical scanline
04h WORD horizontal resolution in pixels
06h WORD vertical resolution in scanlines
08h BYTE character Width in pixels
09h BYTE character Height in pixels
0Ah BYTE number of planes
0Bh BYTE bits per pixels
0Ch BYTE memory model (see #0061)
0Dh BYTE number of Image Pages
0Eh BYTE number of Red bits
0Fh BYTE bit position of Red bit field
10h BYTE number of Green bits
11h BYTE bit position of Green bit field
12h BYTE number of Blue bits
13h BYTE bit position of Blue bit field
14h BYTE number of Reserved bits
15h BYTE bit position of Reserved bit field
16h 235 BYTEs reserved

Bitfields for XGA mode attributes:
Bit(s) Description (Table 0060)
0 set if mode is supported
1 reserved
2 output is supported by the BIOS
3 reserved
4 if set this is a graphics mode (VGA registers inactive, XGA active),
if clear this is a text mode (VGA registers active, XGA inactive)

(Table 0061)
Values for XGA video memory model:
00h Text Mode
01h CGA graphics
02h Hercules graphics
03h 4-planar graphics
04h Packed Pixel
05h Non-chain 4, 256 color
06h Direct Color
07h YUV-24
--------V-104E03-----------------------------------
INT 10 - VESA XGA BIOS Extensions - SET XGA VIDEO MODE
AX = 4E03h
BX = video mode
CX = other command flags
bit 0 If clear the feature connector is set to the default state
DX = XGA handle
ES:DI -> 256 byte buffer
Return: AL = 4Eh if function supported
AH = status
00h function successful
else error code
SeeAlso: AH=00h,AX=4E04h,AX=4F02h
--------V-104E04-----------------------------------
INT 10 - VESA XGA BIOS Extensions - RETURN CURRENT VIDEO MODE
AX = 4E04h
DX = XGA handle
Return: AL = 4Eh if function supported
AH = status
00h function successful
BX??? = current mode
else error code
SeeAlso: AH=0Fh,AX=4E03h,AX=4F03h
--------V-104E05-----------------------------------
INT 10 - VESA XGA BIOS Extensions - SET FEATURE CONNECTOR STATE
AX = 4E05h
BX = Feature Connector State (see #0062)
DX = XGA handle
Return: AL = 4Eh if function supported
AH = status
00h function successful
else error code
SeeAlso: AX=4E00h,AX=4E06h

Bitfields for XGA Feature Connector State:
Bit(s) Description (Table 0062)
0 Feature Connector is enabled
1 Feature Connector is in Output Mode rather than Input Mode
2-15 reserved (0)
--------V-104E06-----------------------------------
INT 10 - VESA XGA BIOS Extensions - RETURN FEATURE CONNECTOR STATE
AX = 4E06h
DX = XGA handle
Return: AL = 4Eh if function supported
AH = status
00h function successful
else error code
BX = Feature Connector State (see #0062)
SeeAlso: AX=4E00h,AX=4E05h
--------V-104F00-----------------------------
INT 10 - VESA SuperVGA BIOS (VBE) - GET SuperVGA INFORMATION
AX = 4F00h
ES:DI -> buffer for SuperVGA information (see #0063)
Return: AL = 4Fh if function supported
AH = status
00h successful
ES:DI buffer filled
01h failed
---VBE v2.0---
02h function not supported by current hardware configuration
03h function invalid in current video mode
Desc: determine whether VESA BIOS extensions are present and the capabilities
supported by the display adapter
SeeAlso: AX=4E00h,AX=4F01h,AX=7F00h,AX=A00Ch
Index: installation check;VESA SuperVGA

Format of SuperVGA information:
Offset Size Description (Table 0063)
00h 4 BYTEs (ret) signature ("VESA")
(call) VESA 2.0 request signature ("VBE2"), required to receive
version 2.0 info
04h WORD VESA version number (one-digit minor version)
06h DWORD pointer to OEM name
"761295520" for ATI
0Ah DWORD capabilities flags (see #0064)
0Eh DWORD pointer to list of supported VESA and OEM video modes
(list of words terminated with FFFFh)
12h WORD total amount of video memory in 64K blocks
---VBE v1.x ---
14h 236 BYTEs reserved
---VBE v2.0 ---
14h WORD OEM software version
16h DWORD pointer to vendor name
1Ah DWORD pointer to product name
1Eh DWORD pointer to product revision string
22h 222 BYTEs reserved
100h 256 BYTEs OEM scratchpad
Notes: the list of supported video modes is stored in the reserved portion of
the SuperVGA information record by some implementations, and it may
thus be necessary to either copy the mode list or use a different
buffer for all subsequent VESA calls
the 1.1 VESA document specifies 242 reserved bytes at the end, so the
buffer should be 262 bytes to ensure that it is not overrun; for
v2.0, the buffer should be 512 bytes
the S3 specific video modes will most likely follow the FFFFH
terminator at the end of the standard modes. A search must then
be made to find them, FFFFH will also terminate this second list

Bitfields for VESA capabilities:
Bit(s) Description (Table 0064)
0 DAC can be switched into 8-bit mode
1 non-VGA controller
2 programmed DAC with blank bit
3-31 reserved
--------V-104F01-----------------------------
INT 10 - VESA SuperVGA BIOS - GET SuperVGA MODE INFORMATION
AX = 4F01h
CX = SuperVGA video mode
ES:DI -> 256-byte buffer for mode information (see #0065)
Return: AL = 4Fh if function supported
AH = status
00h successful
ES:DI buffer filled
01h failed
Desc: determine the attributes of the specified video mode
SeeAlso: AX=4F00h,AX=4F02h

Format of VESA SuperVGA mode information:
Offset Size Description (Table 0065)
00h WORD mode attributes (see #0066)
02h BYTE window attributes, window A (see #0067)
03h BYTE window attributes, window B (see #0067)
04h WORD window granularity in KB
06h WORD window size in KB
08h WORD start segment of window A
0Ah WORD start segment of window B
0Ch DWORD -> FAR window positioning function (equivalent to AX=4F05h)
10h WORD bytes per scan line
---remainder is optional for VESA modes in v1.0/1.1, needed for OEM modes---
12h WORD width in pixels (graphics) or characters (text)
14h WORD height in pixels (graphics) or characters (text)
16h BYTE width of character cell in pixels
17h BYTE height of character cell in pixels
18h BYTE number of memory planes
19h BYTE number of bits per pixel
1Ah BYTE number of banks
1Bh BYTE memory model type (see #0068)
1Ch BYTE size of bank in KB
1Dh BYTE number of image pages
1Eh BYTE reserved (0)
---VBE v1.2+---
1Fh BYTE red mask size
20h BYTE red field position
21h BYTE green mask size
22h BYTE green field size
23h BYTE blue mask size
24h BYTE blue field size
25h BYTE reserved mask size
26h BYTE reserved mask position
27h BYTE direct color mode info
bit 0: color ramp is programmable
bit 1: bytes in reserved field may be used by application
---VBE v2.0 ---
28h DWORD physical address of linear video buffer
2Ch DWORD pointer to start of offscreen memory
30h WORD KB of offscreen memory
32h 206 BYTEs reserved (0)

Bitfields for VESA SuperVGA mode attributes:
Bit(s) Description (Table 0066)
0 mode supported
1 optional information available
2 BIOS output supported
3 set if color, clear if monochrome
4 set if graphics mode, clear if text mode
---VBE v2.0 ---
5 mode is not VGA-compatible
6 bank-switched mode not supported
7 linear framebuffer mode supported

Bitfields for VESA SuperVGA window attributes:
Bit(s) Description (Table 0067)
0 exists
1 readable
2 writable
3-7 reserved

(Table 0068)
Values for VESA SuperVGA memory model type:
00h text
01h CGA graphics
02h HGC graphics
03h 16-color (EGA) graphics
04h packed pixel graphics
05h "sequ 256" (non-chain 4) graphics
06h direct color (HiColor, 24-bit color)
07h YUV (luminance-chrominance, also called YIQ)
08h-0Fh reserved for VESA
10h-FFh OEM memory models
--------V-104F02-----------------------------
INT 10 - VESA SuperVGA BIOS - SET SuperVGA VIDEO MODE
AX = 4F02h
BX = mode (see #0069,#0070)
bit 15 set means don't clear video memory
bit 14 set means enable linear framebuffer mode (VBE v2.0+)
Return: AL = 4Fh if function supported
AH = status
00h successful
01h failed
SeeAlso: AX=4E03h,AX=4F01h,AX=4F03h

(Table 0069)
Values for VESA video mode:
00h-FFh OEM video modes (see #0009 at AH=00h)
100h 640x400x256
101h 640x480x256
102h 800x600x16
103h 800x600x256
104h 1024x768x16
105h 1024x768x256
106h 1280x1024x16
107h 1280x1024x256
108h 80x60 text
109h 132x25 text
10Ah 132x43 text
10Bh 132x50 text
10Ch 132x60 text
---VBE v1.2---
10Dh 320x200x32K
10Eh 320x200x64K
10Fh 320x200x16M
110h 640x480x32K
111h 640x480x64K
112h 640x480x16M
113h 800x600x32K
114h 800x600x64K
115h 800x600x16M
116h 1024x768x32K
117h 1024x768x64K
118h 1024x768x16M
119h 1280x1024x32K
11Ah 1280x1024x64K
11Bh 1280x1024x16M
---VBE 2.0---
81FFh special full-memory access mode
Note: the special mode 81FFh preserves the contents of the video memory and
gives access to all of the memory; VESA recommends that the special
mode be a packed-pixel mode
SeeAlso: #0009,#0070
Index: video modes;VESA

(Table 0070)
Values for S3 OEM video mode:
201h 640x480x256
202h 800x600x16
203h 800x600x256
204h 1024x768x16
205h 1024x768x256
206h 1280x960x16
207h 1152x864x256 (Diamond Stealth 64)
208h 1280x1024x16
20Ah 1152x864x64K (Diamond Stealth 64)
211h 640x480x64K (Diamond Stealth 24)
212h 640x480x16M (Diamond Stealth 24)
301h 640x480x32K
Note: these modes are only available on video cards using S3's VESA driver
SeeAlso: #0069
Index: video modes;S3
--------V-104F03-----------------------------
INT 10 - VESA SuperVGA BIOS - GET CURRENT VIDEO MODE
AX = 4F03h
Return: AL = 4Fh if function supported
AH = status
00h successful
BX = video mode (see #0069,#0070)
bit 14: linear frame buffer enabled (VBE v2.0+)
bit 15: don't clear video memory
01h failed
SeeAlso: AH=0Fh,AX=4E04h,AX=4F02h
--------V-104F04-----------------------------
INT 10 - VESA SuperVGA BIOS - SAVE/RESTORE SuperVGA VIDEO STATE
AX = 4F04h
DL = subfunction
00h get state buffer size
Return: BX = number of 64-byte blocks needed
01h save video states
ES:BX -> buffer
02h restore video states
ES:BX -> buffer
CX = states to save/restore (see #0071)
Return: AL = 4Fh if function supported
AH = status
00h successful
01h failed

Bitfields for VESA SuperVGA states to save/restore:
Bit(s) Description (Table 0071)
0 video hardware state
1 video BIOS data state
2 video DAC state
3 SuperVGA state
--------V-104F05-----------------------------
INT 10 - VESA SuperVGA BIOS - CPU VIDEO MEMORY CONTROL
AX = 4F05h
BH = subfunction
00h select video memory window
DX = window address in video memory (in granularity units)
01h get video memory window
Return: DX = window address in video memory (in gran. units)
BL = window number
00h window A
01h window B
Return: AL = 4Fh if function supported
AH = status
00h successful
01h failed
SeeAlso: AX=4F01h,AX=4F06h,AX=4F07h,AX=7000h/BX=0004h
--------V-104F06-----------------------------
INT 10 - VESA SuperVGA BIOS v1.1+ - GET/SET LOGICAL SCAN LINE LENGTH (PIXELS)
AX = 4F06h
BL = function
00h set scan line length
CX = desired width in pixels
01h get scan line length
Return: AL = 4Fh if function supported
AH = status
00h successful
01h failed
BX = bytes per scan line
CX = number of pixels per scan line
DX = maximum number of scan lines
Notes: if the desired width is not achievable, the next larger width will be
set
the scan line may be wider than the visible area of the screen
this function is valid in text modes, provided that pixel values are
multiplied by the character cell width/height
SeeAlso: AX=4F01h,AX=4F05h,AX=4F06h/BL=02h,AX=4F06h/BL=03h,AX=4F07h
--------V-104F06BL02-------------------------
INT 10 - VESA SuperVGA BIOS v2.0+ - SET LOGICAL SCAN LINE LENGTH (BYTES)
AX = 4F06h
BL = 02h
CX = desired scanline width in bytes
Return: AL = 4Fh if function supported
AH = status
00h successful
01h failed
BX = bytes per scan line
CX = number of pixels per scan line
DX = maximum number of scan lines
Notes: if the desired width is not achievable, the next larger width will be
set
the scan line may be wider than the visible area of the screen
this function is valid in text modes, provided that pixel values are
multiplied by the character cell width/height
SeeAlso: AX=4F01h,AX=4F05h,AX=4F06h,AX=4F06h/BL=03h,AX=4F07h
--------V-104F06BL03-------------------------
INT 10 - VESA SuperVGA BIOS v2.0+ - GET MAXIMUM SCAN LINE LENGTH
AX = 4F06h
BL = 03h
Return: AL = 4Fh if function supported
AH = status
00h successful
01h failed
BX = maximum bytes per scan line
CX = maximum number of pixels per scan line
Notes: this function is valid in text modes, provided that pixel values are
multiplied by the character cell width/height
SeeAlso: AX=4F01h,AX=4F05h,AX=4F06h,AX=4F06h/BL=02h,AX=4F07h
--------V-104F07-----------------------------
INT 10 - VESA SuperVGA BIOS v1.1+ - GET/SET DISPLAY START
AX = 4F07h
BL = function
00h,80h set display start
CX = leftmost displayed pixel in scan line
DX = first displayed scan line
01h get display start
Return: BH = 00h
CX = leftmost displayed pixel in scan line
DX = first displayed scan line
BH = 00h (reserved)
Return: AL = 4Fh if function supported
AH = status
00h successful
01h failed
Notes: this function is valid in text modes, provided that values are
multiplied by the character cell width/height
subfunction 80h waits until vertical retrace before changing the
display start address (VBE v2.0+)
SeeAlso: AX=4F01h,AX=4F05h,AX=4F06h
--------V-104F08-----------------------------
INT 10 - VESA SuperVGA BIOS v1.2+ - GET/SET DAC PALETTE CONTROL
AX = 4F08h
BL = function
00h set DAC palette width
BH = desired number of bits per primary color
01h get DAC palette width
Return: AL = 4Fh if function supported
AH = status
00h successful
01h failed
BH = current number of bits per primary (06h = standard VGA)
--------V-104F09-----------------------------
INT 10 - VESA SuperVGA BIOS v2.0+ - GET/SET PALETTE ENTRIES
AX = 4F09h
BL = function
00h set palette
01h get palette
02h set secondary palette data
03h get secondary palette data
80h set palette during vertical retrace
CX = number of entries to change
DX = starting palette index
ES:DI -> palette buffer (see #0072)
Return: AL = 4Fh if function supported
AH = status
00h successful
01h failed

Format of VESA VBE palette entry:
Offset Size Description (Table 0072)
00h BYTE red
01h BYTE green
02h BYTE blue
03h BYTE alpha or alignment byte
--------V-104F0A-----------------------------
INT 10 - VESA SuperVGA BIOS v2.0+ - GET PROTECTED-MODE CODE
AX = 4F0Ah
BX = function to be copied (see #0073)
Return: AL = 4Fh if function supported
AH = status
00h successful
CX = number of bytes to copy
ES:DI -> code for requested function
01h failed

(Table 0073)
Values for VESA VBE protected-mode function identifiers:
0001h set bank (see AX=4F05h)
0002h set display start (see AX=4F07h)
0003h set palette (see AX=4F09h)
--------p-104F10BL00-------------------------
INT 10 - VESA VBE/PM (Power Management) v1.0+ - GET CAPABILITIES
AX = 4F10h
BL = 00h
ES:DI = 0000h:0000h (reserved for future use)
Return: AL = 4Fh if function supported (installed)
AH = call status
00h successful
else failed
---if successful---
BL = VBE/PM version (bits 7-4: major, bits 3-0: minor)
BH = supported states (see #0074)
ES:DI unchanged
Index: installation check;VESA VBE/Power Management
SeeAlso: AX=4F10h/BL=01h,AX=4F10h/BL=02h

Bitfields for VESA VBE/PM supported power states:
Bit(s) Description (Table 0074)
0 standby
1 suspend
2 off
3 reduced on
--------p-104F10BL01-------------------------
INT 10 - VESA VBE/PM (Power Management) v1.0+ - SET DISPLAY POWER STATE
AX = 4F10h
BL = 01h
BH = new state (see #0075)
Return: AL = 4Fh if function supported
AH = call status
00h successful
else failed
SeeAlso: AX=4F10h/BL=00h,AX=4F10h/BL=02h,AX=A00Ch

(Table 0075)
Values for VESA VBE/PM power state:
00h On
01h standby
02h suspend
04h Off
08h reduced On (for flat screens)
--------p-104F10BL02-------------------------
INT 10 - VESA VBE/PM (Power Management) v1.0+ - GET DISPLAY POWER STATE
AX = 4F10h
BL = 02h
Return: AL = 4Fh if function supported
AH = call status
00h successful
BH = current power state (see #0075)
else failed
SeeAlso: AX=4F10h/BL=00h,AX=4F10h/BL=01h
--------s-104F13BX0000-----------------------
INT 10 - VESA Audio Interface - VBE/AI INSTALLATION CHECK
AX = 4F13h
BX = 0000h
Return: AL = 4Fh if function supported
AH = status
00h successful
BX = version (0010h for 1.00 -- note nonstandard value!)
01h failed
SeeAlso: AX=4F13h/BX=0001h,AX=4F13h/BX=0005h
--------s-104F13BX0001-----------------------
INT 10 - VESA Audio Interface - LOCATE DEVICE
AX = 4F13h
BX = 0001h
CX = 0000h ???
DX = type of device
0001h Wave device
0002h MIDI device
0003h Volume device
Return: AL = 4Fh if function supported
AH = status
00h successful
CX = handle [returned 1 for DX=1 and 3, and 2 for DX=2]
01h failed
SeeAlso: AX=4F13h/BX=0000h,AX=4F13h/BX=0002h
--------s-104F13BX0002-----------------------
INT 10 - VESA Audio Interface - QUERY DEVICE
AX = 4F13h
BX = 0002h
CX = handle
DX = query
0001h return length of GeneralDeviceClass
0002h return copy of GeneralDeviceClass (see #0076)
0003h return length of Volume Info Structure
0004h return copy of Volume Info Structure (see #0086)
0005h return length of Volume Services Structure
0006h return copy of Volume Services Structure (see #0088)
0007h-000Fh reserved
0010h-FFFFh device-specific
SI:DI -> buffer (functions 0002h,0004h,0006h)
Return: AL = 4Fh if function supported
AH = status
00h successful
SI:DI = length (functions 1,3,5)
SI:DI buffer filled (functions 2,4,6)
01h failed
Note: functions 0003h to 0006h are only supported for the Volume device

Format of GeneralDeviceClass structure:
Offset Size Description (Table 0076)
00h 4 BYTEs name of the structure ("GENI")
04h DWORD structure length
08h WORD type of device (1=Wave, 2=MIDI)
0Ah WORD version of VESA driver support (0100h for 1.00)
10h var for CX=handle for Wave device:
Wave Info structure (see #0077)
some bytes ???
for CX=handle for MIDI device:
MIDI Info Structure (see #0082)
first 8 bytes of MIDI Service Structure ???
SeeAlso: #0086,#0088

Format of WAVE Info Structure:
Offset Size Description (Table 0077)
00h 4 BYTEs name of the structure ("WAVI")
04h DWORD structure length [0000007Eh]
08h DWORD driver software version [00000003h]
0Ch 32 BYTEs vendor name, etc. (ASCIZ string)

2Ch 32 BYTEs vendor product name
4Ch 32 BYTEs vendor chip/hardware description
6Ch BYTE installed board number
6Dh 3 BYTEs unused data
70h DWORD feature bits (see #0078)
74h WORD user determined preference field
76h WORD memory required for driver use [0200h]
78h WORD number of timer tick callbacks per second [0000h]
7Ah WORD channels: 1 = mono, 2 = stereo
stereo is assumed to be interleaved data
7Ch WORD bitfield of max sample sizes (see #0079)
SeeAlso: #0082

Bitfields for Wave feature bits:
Bit(s) Description (Table 0078)
0 8000hz Mono Playback
1 8000hz Mono Record
2 8000hz Stereo Record
3 8000hz Stereo Playback
4 8000hz Full Duplex Play/Record
5 11025hz Mono Playback
6 11025hz Mono Record
7 11025hz Stereo Record
8 11025hz Stereo Playback
9 11025hz Full Duplex Play/Record
10 22050hz Mono Playback
11 22050hz Mono Record
12 22050hz Stereo Record
13 22050hz Stereo Playback
14 22050hz Full Duplex Play/Record
15 44100hz Mono Playback
16 44100hz Mono Record
17 44100hz Stereo Record
18 44100hz Stereo Playback
19 44100hz Full Duplex Play/Record
20-26 reserved (0)
27 driver must pre-handle the data
28 Variable Sample mono playback
29 Variable Sample stereo playback
30 Variable Sample mono record
31 Variable Sample stereo record

(Table 0079)
Values for Sample data size:
01h 8bit play
02h 16bit play
10h 8bit record
20h 16bit record

Format of WAVE Audio Services structure:
Offset Size Description (Table 0080)
00h 4 BYTEs name of the structure
04h DWORD structure length
08h 16 BYTEs for future expansion
---entry points (details???)---
18h DWORD DeviceCheck
11h compression (see also #0081)
12h driver state
13h get current pos
14h sample rate
15h set preference
16h get DMA,IRQ
17h get IO address
18h get mem address
19h get mem free
1Ah full duplex
1Bh get block size
1Ch get PCM format
1Dh enable PCM format
80h-.. vendors can add DevChks above 0x80
1Ch DWORD PCMInfo
20h DWORD PlayBlock
24h DWORD PlayCont
28h DWORD RecordBlock
2Ch DWORD RecordCont
30h DWORD PauseIO
34h DWORD ResumeIO
38h DWORD StopIO
3Ch DWORD WavePrepare
40h DWORD WaveRegister
44h DWORD GetLastError
01h unsupported feature/function
02h bad sample rate
03h bad block length
04h bad block address
05h app. missed an IRQ
06h don't understand the PCM size/format
80h-.. vendors specific errors
48h DWORD TimerTick
4Ch DWORD ApplPSyncCB: CallBack: play filled in by the app
50h DWORD ApplRSyncCB: CallBack: rec filled in by the app
SeeAlso: #0084,#0088

(Table 0081)
Values for type of compression:
01h IMA play
02h ALAW play
03h ULAW play
11h IMA record
12h ALAW record
13h ULAW record

Format of MIDI Info Structure:
Offset Size Description (Table 0082)
00h 4 BYTEs name of the structure ("MIDI")
04h DWORD structure length
08h DWORD driver software version [00000003h]
0Ch 32 BYTEs vendor name, etc. (ASCIZ string)
2Ch 32 BYTEs vendor product name
4Ch 32 BYTEs vendor chip/hardware description
6Ch BYTE installed board number
6Dh 3 BYTEs unused data
70h 14 BYTEs the patch library file name [OPL2.BNK 00..]
7Eh DWORD feature bits (see #0083)
80h WORD user determined preference field
82h WORD memory required for driver use
84h WORD # of timer tick callbacks per second
86h WORD max # of tones (voices, partials)
SeeAlso: #0076,#0084,#0086

Bitfields for MIDI feature bits:
Bit(s) Description (Table 0083)
0-3 reserved for GM extensions
4 Transmitter/Receiver only
5 Patches preloaded
6 MIDI receive has time stamp
8 MIDI interrupt driven input supported
9 MIDI polled input supported
10 MIDI remote patches supported

Format of MIDI Service structure:
Offset Size Description (Table 0084)
00h 4 BYTEs name of the structure ("MIDS")
04h DWORD structure length
08h 16 WORDs patches loaded table bit field
28h 16 BYTEs for future expansion
---entry points (details???)---
38h DWORD device check
11h return available tones
12h return TRUE/FALSE if patch is understood
13h set preference
14h allow/disallow voice stealing
15h get FIFO sizes
16h get DMA,IRQ
17h get IO address
18h get mem address
19h get mem free
80h-.. vendors can add DevChks above 0x80
3Ch DWORD global reset
40h DWORD MIDI msg
44h DWORD poll MIDI
48h DWORD preload patch
4Ch DWORD unload patch
50h DWORD timer tick
54h DWORD get last error
01h unsupported feature/function
02h unknown patch type (see #0085)
03h all tones are used
04h messages are out of sync
05h an incoming patch was incomplete
06h an incoming patch couldn't be stored
07h had to drop an incoming byte
08h driver is failing a patch download
80h-.. vendors specific errors
58h DWORD Patch Block free callback
5Ch DWORD MIDI byte avail. callback
SeeAlso: #0080,#0088

(Table 0085)
Values for MIDI Registered Patch Types:
10h OPL2
11h OPL3

Format of Volume Info Structure:
Offset Size Description (Table 0086)
00h 4 BYTEs name of the structure ("VOLI")
04h DWORD structure length (00000092h)
08h DWORD driver software version [00000001h]
0Ch 32 BYTEs vendor name, etc. (ASCIZ string)
2Ch 32 BYTEs vendor product name
4Ch 32 BYTEs vendor chip/hardware description
6Ch BYTE installed board number (0 for 1st/only board)
6Dh 3 BYTEs unused data (0)
70h 24 BYTEs text name of the mixer channel
88h DWORD features bits (see #0087)
8Ch WORD minimum volume setting
8Eh WORD maximum volume setting
90h WORD attenuation/gain crossover
SeeAlso: #0076,#0088

Bitfields for Volume feature bits:
Bit(s) Description (Table 0087)
0 Stereo Volume control available
2 Low Pass Filter is available
3 High Pass Filter is available
4 Parametric Tone Control is available
5 selectable output paths
8 Azimuth Field positioning supported
9 Phi Field positioning supported
10-30 unused???
31 Master Volume device

Format of Volume Services Structure:
Offset Size Description (Table 0088)
00h 4 BYTEs name of the structure ("VOLS")
04h DWORD structure length (00000038h)
08h 16 BYTEs 16 bytes for future expansion (0)
---entry points (details???)---
18h DWORD device check
0011h filter range
0012h filter setting
0013h filter current
0014h tone range
0015h tone setting
0016h tone current
0017h path
0018h get IO address
0080h-.. vendors can add DevChks above 0x80
1Ch DWORD set vol to an absolute setting
01h User master volume setting
02h application master volume setting
20h DWORD set 3D volume
24h DWORD tone control
28h DWORD filter control
2Ch DWORD output path
30h DWORD reset channel
34h DWORD get last error
01h unsupported feature/function
02h out of range parameter value
80h+ vendor-specific errors
SeeAlso: #0080,#0084
--------s-104F13BX0003-----------------------
INT 10 - VESA Audio Interface - OPEN DEVICE
AX = 4F13h
BX = 0003h
CX = handle
DX = API set (16/32-bit)
SI = segment ???
Return: AL = 4Fh if function supported
AH = status
00h successful
SI:CX -> memory ???
01h failed
SeeAlso: AX=4F13h/BX=0000h,AX=4F13h/BX=0002h,AX=4F13h/BX=0004h
--------s-104F13BX0004-----------------------
INT 10 - VESA Audio Interface - CLOSE DEVICE
AX = 4F13h
BX = 0004h
CX = handle
Return: AL = 4Fh if function supported
AH = status
00h successful
01h failed
SeeAlso: AX=4F13h/BX=0000h,AX=4F13h/BX=0003h,AX=4F13h/BX=0005h
--------s-104F13BX0005-----------------------
INT 10 - VESA Audio Interface - UNINSTALL DRIVER
AX = 4F13h
BX = 0005h
Return: AL = 4Fh if function supported
AH = status
00h successful
01h failed
SeeAlso: AX=4F13h/BX=0000h,AX=4F13h/BX=0006h
--------s-104F13BX0006-----------------------
INT 10 - VESA Audio Interface - DRIVER CHAIN/UNCHAIN
AX = 4F13h
BX = 0006h
Return: AL = 4Fh if function supported
AH = status
00h successful
01h failed
SeeAlso: AX=4F13h/BX=0000h,AX=4F13h/BX=0005h
--------V-104F4D-----------------------------
INT 10 - VESA - VIDEO CURSOR INTERFACE REQUEST
AX = 4F4Dh
BX = number of bytes available for VCI use
DS:0000h -> buffer for VCI
ES:DI -> VCI driver callback function
Return: AL = 4Fh if supported
AH = status
00h successful
BX = number of bytes used by VCI
ES:DI -> VCI request handler
01h failed
Desc: allow the VESA BIOS Extensions to cooperate with a pointing-device
(typically mouse) driver
--------V-104FFF-----------------------------
INT 10 - VESA SuperVGA BIOS - Everex - TURN VESA ON/OFF
AX = 4FFFh
DL = new state (00h off, 01h on)
Return: AX = 0000h if successful
--------V-104FFF-----------------------------
INT 10 - Diamond Stealth 24 - SET/RESET DUAL DISPLAY MODE
AX = 4FFFh
BX = dual display mode
00h reset
01h set dual display, 32KB VGA test
02h set dual display, 64KB VGA test
Return: AX = 4F00h if successful
BX = number of scanlines off screen for test mode
--------U-1050-------------------------------
INT 10 - SCROLOCK.COM - INSTALLATION CHECK
AH = 50h
Return: BX = 1954h if installed
AL = 00h if inactive, nonzero if active
Program: SCROLOCK is a utility supplied with System Enhancement Associates' ARC
SeeAlso: AH=51h
--------J-105000-----------------------------
INT 10 - VIDEO - AX PC - SET SCREEN COUNTRY CODE
AX = 5000h
BX = country code
0001h USA (English), 0051h Japan
Return: AL = status
00h successful
01h bad country code
02h other error
SeeAlso: AX=5001h,INT 16/AX=5000h
--------J-105001-----------------------------
INT 10 - VIDEO - AX PC - GET SCREEN COUNTRY CODE
AX = 5001h
Return: AL = status
00h successful
BX = country code
02h error
SeeAlso: AH=00h,AX=5000h,INT 16/AX=5001h,INT 21/AH=38h
--------V-105049-----------------------------
INT 10 - VIDEO - SCREENR v1.55+ - API
AX = 5049h ('PI')
BX = function
0000h installation check
0001h lock mode
0002h unlock mode
0003h lock palette
0004h unlock palette
Return: AX = 0000h if installed
BX = TSR version (BH=major,BL=minor)
CL = mode locking status
00h mode not locked
01h mode locked: INT 10/AH=00h disabled
CH = palette locking status
00h palette not locked
01h palette locked, the following functions are disabled:
AX=1000h, AX=1001h, AX=1002h, AX=1010h, AX=1012h
Program: SCREENR is a TSR supplied with Patrick Ibbetson's SCREEN display
utility.
Index: installation check;SCREENR
--------U-1051-------------------------------
INT 10 - SCROLOCK.COM - ENABLE/DISABLE
AH = 51h
AL = state
00h disable
nonzero enable
Program: SCROLOCK is a utility supplied with System Enhancement Associates' ARC
SeeAlso: AH=50h"SCROLOCK"
--------J-105100-----------------------------
INT 10 - VIDEO - AX PC - REGISTER EXTERNAL CHARACTER
AX = 5100h
BH = character width in bits (10h)
BL = character height (10h)
DX = character code (DH = F0h-F3h, DL=40h-7Eh,80h-FCh)
ES:BP -> character bitmap
Return: AL = status (00h successful, 01h failed)
SeeAlso: AX=5101h,INT 1F
--------J-105101-----------------------------
INT 10 - VIDEO - AX PC - READ CHARACTER
AX = 5101h
BH = character width in bits
BL = character height
DX = character code (DH = 00h if 8-bit character)
ES:BP -> buffer for character bitmap
Return: AL = status (00h successful, 01h failed)
SeeAlso: AH=09h,AX=5100h
--------J-105200-----------------------------
INT 10 - VIDEO - AX PC - SET VIRTUAL TEXT RAM BUFFER
AX = 5200h
BX = segment of buffer
SeeAlso: AX=5201h
--------J-105201-----------------------------
INT 10 - VIDEO - AX PC - GET VIRTUAL TEXT RAM BUFFER
AX = 5201h
Return: BX = segment of buffer or 0000h if failed
SeeAlso: AX=8300h,AH=FEh
----------1053-------------------------------
INT 10 - Show Partner F/X v3.6 - START PRESENTATION
AH = 53h
DS:DX -> ASCIZ name of presentation file (no path, extension forced to
.PR2)
Return: ???
SeeAlso: AH=55h
----------1055-------------------------------
INT 10 - Show Partner F/X v3.6 - UNINSTALL
AH = 55h
Return: FXSHOW.EXE removed from memory
SeeAlso: AH=53h
--------V-105555-----------------------------
INT 10 - VIDEO - ATI EGA/VGA Wonder Super Switch - INSTALLATION CHECK
AX = 5555h
Return: AX = AAAAh if installed
BX:CX -> ??? routine in SMS.COM resident portion
-> data area (see #0089) in VCONFIG
Program: Super Switch (SMS.COM) is a video mode switch program supplied with
ATI EGA Wonder. It also maps video mode 08h to 27h or 23h.
SeeAlso: INT 10/AH=00h,INT 14/AX=AA01h,INT 2F/AX=6400h
Index: screen saver;ATI Wonder SMS.COM

Format of ATI Super Switch data area:
Offset Size Description (Table 0089)
00h DWORD original INT 09 vector
04h DWORD original INT 10 vector
08h DWORD original INT 1C vector
0Ch WORD screen saver state, 0=off, 1=on
0Eh WORD blanking interval in clock ticks
--------V-105F00-----------------------------
INT 10 - Chips & Technologies Extended BIOS - RETURN CHIP INFORMATION
AX = 5F00h
Return: AL = 5Fh function supported
BL = chip type (see #0090)
BH = video memory size (00h 256KB, 01h 512KB, 02h 1MB)
CX = miscellaneous information (see #0091)
SeeAlso: AX=5F01h

Bitfields for Chips&Technologies chip type:
Bit(s) Description (Table 0090)
7-4 chip type
0000: 82c451
0001: 82c452
0010: 82c455
0011: 82c453
0101: 82c456
0110: 82c457
0111: F65520
1000: F65530
1100: F65535/F65545 ???
1101: F65540
3-0 revision number

Bitfields for Chips&Technologies miscellaneous information:
Bit(s) Description (Table 0091)
0 DAC size (0=6-bit, 1=8-bit)
1 system type (0=PC/AT, 1=PS/2)
2 extended text modes supported by BIOS
3 reserved
4 extended graphics modes supported by BIOS
5 reserved
6 BIOS supports graphics cursor
7 BIOS supports anti-aliased font
8 BIOS supports pre-programmed emulation
9 BIOS supports auto emulation
10 BIOS supports variable mode set at cold boot
11 BIOS supports variable mode set on warm boot
12 BIOS supports emulation mode set at cold boot
13 BIOS supports emulation mode set on warm boot
14-15 reserved
--------V-105F00-----------------------------
INT 10 - VIDEO - Realtek RTVGA - RETURN CHIP VERSION
AX = 5F00h
Return: AH = 00h, if successful
AL = chip version (the same value that VTEST.EXE reads)
00h RTG3103???
01h RTG31030/RTG3105
02h RTG3106???
3Fh non-Realtek chip
BUG: in v3.C10, AX=5F00h on return due to improper stack restoration code
SeeAlso: AX=5F01h"RTVGA"
--------V-105F01-----------------------------
INT 10 - Chips & Technologies Extended BIOS - SET PREPROGRAMMED EMULATION
AX = 5F01h
BL = emulation type (see #0092)
Return: AL = 5Fh if function supported
AH = status
00h unsuccessful
01h successful
SeeAlso: AX=5F00h,AX=5F02h,AH=FFh"Oak"

(Table 0092)
Values for Chips&Technologies emulation type:
00h,01h reserved
02h CGA
03h MDA
04h Hercules
05h EGA
06h VGA
--------V-105F01-----------------------------
INT 10 - VIDEO - Realtek RTVGA - WRITE RTVGA BIOS STRING TO DESTINATION
AX = 5F01h
ES:DI -> zero-filled buffer for BIOS ID string
Return: AH = 00h if successful
ES:DI -> ASCII signature "REALTEK VGA BIOS Version 3C.10"
BUG: in v3.C10, AX=5F01h on return due to improper stack restoration code
SeeAlso: AX=5F00h"RTVGA",AX=5F02h"RTVGA"
--------V-105F02-----------------------------
INT 10 - Chips & Technologies Extended BIOS - AUTO EMULATION CONTROL
AX = 5F02h
BL = new state of autmatic emulation (00h enabled, 01h disabled)
Return: AL = 5Fh if function supported
AH = status
00h unsuccessful
01h successful
SeeAlso: AX=5F01h,AX=5F03h
--------V-105F02-----------------------------
INT 10 - VIDEO - Realtek RTVGA - RETURN RTVGA ON-BOARD MEMORY SIZE
AX = 5F02h
Return: AH = 00h, if successful
AL = on-board memory size
(00h = 256K, 01h = 512K, 02h = 768K, 03h = 1024K)
BUG: in v3.C10, AX=5F02h on return due to improper stack restoration code
SeeAlso: AX=5F01h"RTVGA",AX=5F03h"RTVGA"
--------V-105F03-----------------------------
INT 10 - VIDEO - Realtek RTVGA - SET ???
AX = 5F03h
BL = 0-3 (???)
Return: AH = 00h if successful
BUG: in v3.C10, AX=5F03h on return due to improper stack restoration code
SeeAlso: AX=5F02h"RTVGA"
--------V-105F03-----------------------------
INT 10 - Chips & Technologies Extended BIOS - SET POWER-ON VIDEO CONDITIONS
AX = 5F03h
BL = configuration
00h power-up display mode
CL = display mode
CH = mode (see #0093)
01h power-up emulation mode
CL = emulation mode (see #0092)
CH = permanence (00h reset after next boot, 01h until changed)
Return: AL = 5Fh if function supported
AH = status
00h unsuccessful
01h successful
SeeAlso: AX=5F02h,AX=5F03h/BL=01h,AX=5F90h

Bitfields for Chips&Technologies display mode:
Bit(s) Description (Table 0093)
1-0 scanlines (00 = 200, 01 = 350, 10 = 400)
7 persistence (0 reset on next boot, 1 until changed)
--------V-105F03BL01-------------------------
INT 10 - Chips & Technologies Extended BIOS - SET POWER-ON EMULATION MODE
AX = 5F03h
BL = 01h
CL = emulation mode
CH = mode
bit 7 persistence (0 reset on next boot, 1 until changed)
Return: AL = 5Fh if function supported
AH = status
00h unsuccessful
01h successful
SeeAlso: AX=5F02h,AX=5F03h/BL=00h,AX=5F90h
--------V-105F10-----------------------------
INT 10 - Chips & Technologies Extended BIOS - ???
AX = 5F10h
DX = ???
Return: DX = ???
--------V-105F50-----------------------------
INT 10 - Chips & Technologies Extended BIOS - GET LAPTOP DISPLAY STATUS
AX = 5F50h
Return: DL = display status (see #2710)
Note: this call can be used on Toshiba laptops since ~1995 instead of
INT 42/AX=7503h which is no longer supported with the F655xx chips
SeeAlso: INT 42/AX=7503h

Bitfields for display status:
Bit(s) Description (Table 2710)
7-4 always 0 ???
3 1: both displays active (bit 1 also set)
2 1: normal (monochrome display only), 0: inverse or color
1 1: internal display active, 0: external only
0 always set ???
--------V-105F51-----------------------------
INT 10 - Chips & Technologies Extended BIOS - SET DISPLAY STATUS ???
AX = 5F51h
BX = ???
Return: nothing
--------V-105F5EBL00-------------------------
INT 10 - Chips & Technologies Extended BIOS - SET ???
AX = 5F5Eh
BL = 00h or 01h
Return: nothing
--------V-105F-------------------------------
INT 10 - Chips & Technologies Extended BIOS - SAVE/RESTORE SUPERVGA STATE
AH = 5Fh
AL = subfunction
90h determine size of save buffer
91h save state
92h restore state
CX = state mask (see #0094)
ES:BX -> save buffer (subfunctions 91h,92h only)
Return: AL = 5Fh if function supported
---subfunction 90h---
BX = number of 64-byte blocks required
---subfunction 92h---
buffer at ES:BX filled
SeeAlso: AH=1Ch,AX=5F03h

Bitfields for Chips&Technologies state mask:
Bit(s) Description (Table 0094)
0 video hardware
1 BIOS data state
2 DAC state
15 type (0 all state info, 1 SuperVGA state only)
--------V-1060------------------------------------
INT 10 - HUNTER 16 - SET GRAPHICS FONT
AH = 60h
AL = new font
bit 7 output characters in reverse video
bits 0-6 font number (see #0108 at AH=77h)
Return: BH = cell width
BL = cell height
Desc: select the font to use for output in mode 6; this can be used to mix
fonts on the screen
Note: the Husky Hunter 16 is an 8088-based ruggedized laptop. Other family
members are the Husky Hunter, Husky Hunter 16/80, and Husky Hawk.
SeeAlso: AH=04h"HUNTER",AH=73h"HUNTER",AH=77h"HUNTER"
--------V-1061------------------------------------
INT 10 - HUNTER 16 - MOVE CURSOR TO GRAPHICS CO-ORDINATES
AH = 61h
CX = column
DX = row
Note: this function is only valid in graphics modes
SeeAlso: AH=62h
--------V-1062------------------------------------
INT 10 - HUNTER 16 - GET CURSOR POSITION IN GRAPHICS CO-ORDINATES
AH = 62h
Return: CX = column
DX = row
Note: this function is only valid in graphics modes
SeeAlso: AH=61h
--------V-1063------------------------------------
INT 10 - HUNTER 16 - SET CONTRAST
AH = 63h
AL = contrast (0..127)
Desc: set the LCD screen contrast to improve visibility
SeeAlso: AH=64h,AH=75h
--------V-1064------------------------------------
INT 10 - HUNTER 16 - SET BACKLIGHT LEVEL
AH = 64h
AL = level (0..15)
Desc: set the LCD backlight level to improve visibility in bad lighting
SeeAlso: AH=63h,AH=65h,AH=74h,AH=78h"HUNTER",INT 15/AH=74h
--------V-106500----------------------------------
INT 10 - HUNTER 16 - GET BACKLIGHT TIMEOUT
AX = 6500h
Return: BX = timeout in seconds (0-300)
Desc: returns the time after which the backlight will turn off
SeeAlso: AH=63h,AH=64h,AX=6501h,INT 15/AH=74h
--------V-106501----------------------------------
INT 10 - HUNTER 16 - SET BACKLIGHT TIMEOUT
AX = 6501h
BX = timeout in seconds (0-300)
Desc: set the idle time after which the backlight will turn off
SeeAlso: AH=64h,AX=6500h
--------V-1066------------------------------------
INT 10 - HUNTER 16 - SPLIT DISPLAY
AH = 66h
AL = control bits (see #0095)
BH = top row of lower section of LCD (0..7)
BL = top row of lower section of the virtual screen (0..24)
Desc: split the LCD screen horizontally into two parts; each part may be
individually scrollable or fixed.
Note: the Hunter 16 has a 240x64 LCD display which serves as a window into
a 640x200 virtual screen

Bitfields for HUNTER 16 control bits:
Bit(s) Description (Table 0095)
0-1 01: no split, 10: allow split
2 allow scrolling the upper part
3 allow scrolling the lower part
--------V-106A00BX0000-----------------------
INT 10 - Direct Graphics Interface Standard (DGIS) - INQUIRE AVAILABLE DEVICES
AX = 6A00h
BX = 0000h
CX = 0000h
DX = buffer length (may be 0)
ES:DI -> buffer
Return: BX = number of bytes stored in buffer
CX = bytes required for all descriptions (0 if no DGIS)
Note: buffer contains descriptions and addresses of DGIS-compatible
display(s) and printer(s)
SeeAlso: AX=6A02h
--------V-106A01CX0000-----------------------
INT 10 - Direct Graphics Interface Standard (DGIS) - REDIRECT CHARACTER OUTPUT
AX = 6A01h
CX = 0000h
ES:DI = address of device to send INT 10 output to
Return: CX = 0000h output could not be redirected
else INT 10h output now routed to requested display
SeeAlso: AX=6A02h
--------V-106A02-----------------------------
INT 10 - DGIS - INQUIRE INT 10 OUTPUT DEVICE
AX = 6A02h
ES:DI = 0000h:0000h
Return: ES:DI = 0000h:0000h if current display is non-DGIS
else address of the current DGIS INT 10 display
SeeAlso: AX=6A00h,AX=6A01h
--------V-106E00-----------------------------
INT 10 - Paradise VGA internal - GET ???
AX = 6E00h
Return: BX = 5744h ('WD') if supported
DH:AH:AL = last three ASCII digits of ROM serial number
CL = ???
CH = ???
SeeAlso: AX=6E04h,AX=6E05h
--------V-106E04-----------------------------
INT 10 - Paradise VGA internal - GET SCREEN SIZE AND ???
AX = 6E04h
Return: BX = screen width (columns)
CX = screen height (lines)
AH = ??? (05h or FFh)
AL = ??? (04h or video mode)
SeeAlso: AX=6E00h,AX=6E05h
--------V-106E05-----------------------------
INT 10 - Paradise VGA internal - SET MODE
AX = 6E05h
BL = mode
Note: like AH=00h, AL=BL.
SeeAlso: AH=00h,AX=6E00h,AX=6E04h,AX=6F05h
--------V-106F00-----------------------------
INT 10 - HP Vectra EX-BIOS - INSTALLATION CHECK
AX = 6F00h
BX <> 4850h (usually set to 0000h for simplicity)
Return: BX = 4850h ('HP') indicates HP Extended BIOS video functions present
AX destroyed
SeeAlso: AX=6F00h"Video7",AX=6F01h,AX=6F02h,AX=6F03h,AX=6F04h,AX=6F05h
SeeAlso: INT 14/AX=6F00h,INT 16/AX=6F00h,INT 17/AX=6F00h,INT 33/AX=6F00h
--------V-106F00BX0000-----------------------
INT 10 - VIDEO - Video7 VGA,VEGA VGA - INSTALLATION CHECK
AX = 6F00h
BX = 0000h
Return: BX = 5637h ('V7') indicates Video7 VGA/VEGA VGA extensions are present
SeeAlso: AX=6F01h,AX=6F02h,AX=6F03h,AX=6F04h,AX=6F05h
--------V-106F01-----------------------------
INT 10 - VIDEO - Video7 VGA,VEGA VGA,HP EX-BIOS - GET MONITOR INFO
AX = 6F01h
Return: AL = monitor type code (HP,VEGA VGA only) (see #0096)
AH = status register information (see #0097)
CL = current value of Extended Control register (HP Ext BIOS, and only
if AL=41h) (see #0098)
Notes: bits 0-3 are the same as the EGA/VGA status register bits 0-3
supported by original HP Vectra AT and by ES/QS/RS series Vectras

(Table 0096)
Values for monitor type code (HP Extended BIOS):
00h non-HP card with ROM and possibly its own INT 10h driver
41h MultiMode video display adapter
42h-44h reserved
45h industry standard monochrome display adapter
46h industry standard color display adapter
51h reserved

Bitfields for status register information:
Bit(s) Description (Table 0097)
0 display enable
0 = display enabled
1 = vertical or horizontal retrace in progress
1 light pen flip flop set
2 light pen switch activated
3 vertical sync
4 monitor resolution
0 = high resolution (>200 lines)
1 = low resolution (<=200 lines)
5 display type (0 = color, 1 = monochrome)
6,7 diagnostic bits
Note: bits 0-3 are the same as the EGA/VGA status register bits 0-3
--------V-106F02-----------------------------
INT 10 - HP Vectra EX-BIOS - SET MONITOR INFO
AX = 6F02h
BL = new value for extended control register (see #0098)
Return: AX,BL destroyed
Notes: this function is only valid when an HP MultiMode Video Display Adapter
is installed
the Extended Control register is at I/O address 3DDh
SeeAlso: AX=6F01h,AX=6F03h

Bitfields for HP Vectra extended control register:
Bit(s) Description (Table 0098)
0 screen resolution (0 = 200 lines, 1 = 400 lines)
1 underline enable (if set, 'blue' of fg color = underline)
2 font (0 = Standard-8, 1 = HP-Roman-8)
3 memory disabled for CPU access
4 allow access to full 32K memory instead of wrapping at 16K
5 select second 16K page instead of first
6,7 unused
--------V-106F03-----------------------------
INT 10 - HP Vectra EX-BIOS - MODIFY MONITOR INFO
AX = 6F03h
BH = exclude mask (set bits are not modified)
BL = new values for bits indicated by BH (see #0098)
Return: AX destroyed
Notes: this function is only valid when an HP MultiMode Video Display Adapter
is installed
supported by original HP Vectra AT and by ES/QS/RS series Vectras
SeeAlso: AX=6F01h,AX=6F02h
--------V-106F04-----------------------------
INT 10 - VIDEO - Video7 VGA,VEGA VGA,HP Vectra - GET MODE AND SCREEN RESOLUTION
AX = 6F04h
Return: AL = current video mode (see #0099)
BX = horizontal columns (text) or pixels (graphics)
CX = vertical columns (text) or pixels (graphics)
SeeAlso: AX=6F05h
--------V-106F05-----------------------------
INT 10 - VIDEO - Video7 VGA,VEGA EXTENDED EGA/VGA,HP Vectra - SET VIDEO MODE
AX = 6F05h
BL = mode (see #0099)
Return: AX,BL destroyed
Notes: also supported by the HP Vectra Extended BIOS on the original
HP Vectra AT and by ES/QS/RS series Vectras
on the HP Vectra, this function rather than AH=00h must be used to
return to an IBM-standard mode after setting an HP-specified mode
from 08h to 0Fh.
SeeAlso: AH=00h,AX=0070h,AX=007Eh,AX=6F04h

(Table 0099)
Values for Video7/VEGA video mode:
text/ text pixel pixel colors disply scrn system
grph resol box resolution pages addr
00h-13h = standard IBM modes (see #0009 at AH=00h)
08h = T 80x27 . . mono . . HP MultiMode Video
09h = T 80x27 . . . . . HP MultiMode Video
0Ah = T 40x27 . . mono . . HP MultiMode Video
0Bh = T 40x27 . . . . . HP MultiMode Video
0Ch = reserved HP MultiMode Video
0Dh = G . . 640x400 . . . HP MultiMode Video
0Eh = G . . 320x400 . . . HP MultiMode Video
0Fh = G . . 320x400 . . . HP MultiMode Video
40h = T 80x43 8x8 . . . . Video7/VEGA VGA
41h = T 132x25 8x14 . . . . Video7/VEGA VGA
42h = T 132x43 8x8 . . . . Video7/VEGA VGA
43h = T 80x60 8x8 . . . . Video7/VEGA VGA
44h = T 100x60 8x8 . . . . Video7/VEGA VGA
45h = T 132x28 8x8 . . . . Video7/VEGA VGA
60h = G . . 752x410 16 . . Video7 VGA, VEGA VGA
61h = G . . 720x540 16 . . Video7 VGA, VEGA VGA
= G . . 720x540 16 . . Northgate, Headland 1024i
62h = G . . 800x600 16 . . Video7 VGA, VEGA Ext EGA
= G . . 800x600 16 . . Headland 1024i
63h = G . . 1024x768 2 . . Video7 VGA
64h = G . . 1024x768 4 . . Video7 VGA
65h = G . . 1024x768 16 . . Video7 VGA, VEGA Ext EGA
= G . . 1024x768 16 . . Headland 1024i
66h = G . . 640x400 256 . . Video7 VGA, VEGA Ext VGA
= G . . 640x400 256 . . Northgate, Headland 1024i
67h = G . . 640x480 256 . . Video7 VGA, VEGA Ext VGA
= G . . 640x480 256 . . Headland 1024i
68h = G . . 720x540 256 . . Video7 VGA, VEGA Ext VGA
= G . . 720x540 256 . . Headland 1024i
69h = G . . 800x600 256 . . Video7 VGA, VEGA Ext VGA
= G . . 800x600 256 . . Headland 1024i
70h = G . . 752x410 16gray . . Video7 VGA, VEGA VGA
71h = G . . 720x540 16gray . . Video7 VGA, VEGA VGA
72h = G . . 800x600 16gray . . Video7 VGA
73h = G . . 1024x768 2gray . . Video7 VGA
74h = G . . 1024x768 4gray . . Video7 VGA
75h = G . . 1024x768 16gray . . Video7 VGA
76h = G . . 640x400 256gray . . Video7 VGA
77h = G . . 640x480 256gray . . Video7 VGA
78h = G . . 720x540 256gray . . Video7 VGA
79h = G . . 800x600 256gray . . (future)
SeeAlso: AH=00h,AX=0070h,AX=007Eh,AX=6F04h
Index: video modes;Video 7|video modes;VEGA|video modes;Headland
--------V-106F06-----------------------------
INT 10 - VIDEO - Video7 VGA,VEGA VGA - SELECT AUTOSWITCH MODE
AX = 6F06h
BL = Autoswitch mode select
00h select EGA/VGA-only modes
01h select Autoswitched VGA/EGA/CGA/MGA modes
02h select 'bootup' CGA/MGA modes
BH = enable/disable (00h enable, 01h = disable selection)
--------V-106F07-----------------------------
INT 10 - VIDEO - Video7 VGA,VEGA VGA - GET VIDEO MEMORY CONFIGURATION
AX = 6F07h
Return: AL = 6Fh
AH = memory configuration
bits 0-6 = number of 256K blocks of video memory
bit 7 = DRAM/VRAM (0: DRAM, 1: VRAM)
BH = chip revision (SR8F) (S/C Chip in VEGA VGA)
BL = chip revision (SR8E) (G/A Chip in VEGA VGA)
CX = 0000h
SeeAlso: AH=12h/BL=10h
--------V-1070-------------------------------
INT 10 - VIDEO - TANDY 2000 only - GET ADDRESS OF VIDEO RAM
AH = 70h
Return: AX:BX -> WORD containing green plane's offset
AX:CX -> WORD containing green plane's segment
AX:DX -> WORD containing segment of red (offset 0) and blue (offset
4000) planes
SeeAlso: AH=71h
--------V-1070------------------------------------
INT 10 - HUNTER 16 - DRAW ELLIPSE/CIRCLE
AH = 70h
DS:BX -> control block (see #0100)
Desc: Draws a circle or ellipse. Only valid in graphics modes.
Note: the Husky Hunter 16 is an 8088-based ruggedized laptop. Other family
members are the Husky Hunter, Husky Hunter 16/80, and Husky Hawk.
SeeAlso: AH=71h"HUNTER"

Format of HUNTER 16 control block:
Offset Size Description (Table 0100)
00h WORD center X co-ordinate
02h BYTE center Y co-ordinate
03h WORD radius in pixels
05h BYTE color (00h white, 01h black, FFh invert)
06h BYTE aspect ratio x:x (1-127)
07h BYTE aspect ratio y:y (1-127)
--------V-107000BX0000-----------------------
INT 10 - Everex Extended Video BIOS - RETURN EMULATION STATUS
AX = 7000h
BX = 0000h
Return: AL = 70h if Trident-based Everex card
CL = monitor type (see #0101)
CH = feature bits (see #0102)
DX = video board info
bits 4-15: board ID model (see #0103)
bits 0-3: board ID revision
DI = BCD BIOS version number
SeeAlso: AX=5F01h,AH=FF"Oak"

(Table 0101)
Values for Everex monitor type:
00h mono
01h CGA
02h EGA
03h digital multifrequency
04h IBM PS/2
05h IBM 8514
06h SuperVGA
07h analog multifrequency
08h super multifrequency

Bitfields for Everex feature bits:
Bit(s) Description (Table 0102)
7-6 memory size
00 = 256K
01 = 512K
10 = 1024K
11 = 2048K
5 special oscillator present
4 VGA protect enabled
0 6845 emulation

(Table 0103)
Values for board model for Trident-based Everex cards:
0236h Ultragraphics II
0620h Vision VGA
0673h EVGA
0678h Viewpoint
--------V-107000BX0004-----------------------
INT 10 - Everex Extended Video BIOS - GET PAGING FUNCTION POINTER FOR CURR MODE
AX = 7000h
BX = 0004h
Return: ES:DI -> FAR paging function (call with DL = page to set)
Note: the word preceding ES:DI is the length of the function in bytes, and
the last byte of the function is a FAR return instruction.
SeeAlso: AX=4F05h,AX=7000h/BX=0000h,AX=7000h/BX=0005h
--------V-107000BX0005-----------------------
INT 10 - Everex Extended Video BIOS - GET SUPPORTED MODE INFO
AX = 7000h
BX = 0005h
CL = maximum number of modes to get info for
CH = mode type to get info for (see #0104)
DL = monitor type to get info for
ES:DI -> buffer for mode info (see #0105)
Return: CL = total number of modes fitting criteria
CH = size of each info record
SeeAlso: AX=7000h/BX=0000h,AX=7000h/BX=0004h

(Table 0104)
Values for Everex mode type:
00h all modes
01h monochrome text modes
02h color text modes
03h four-color CGA graphics modes
04h two-color CGA graphics modes
05h 16-color graphics modes
06h 256-color graphics modes

Format of Everex mode information record:
Offset Size Description (Table 0105)
00h BYTE mode number (bit 7 set if extended mode)
01h BYTE mode type (see #0104)
02h BYTE info bits (see #0106)
03h BYTE font height
04h BYTE text columns on screen
05h BYTE text rows on screen
06h WORD number of scan lines
08h BYTE color information
bits 7-4 reserved
3-0 bits per pixel

Bitfields for Everex info bits:
Bit(s) Description (Table 0106)
7,6 reserved
5 monochrome mode
4 interlaced display
3 requires special oscillator
2,1 memory required (00 = 256K, 01 = 512K, 10 = 1024K, 11 = 2048K)
0 reserved
--------V-1071-------------------------------
INT 10 - VIDEO - TANDY 2000 only - GET ADDRESS OF INCRAM
AH = 71h
Return: AX:BX -> WORD containing segment address of INCRAM
AX:CX -> WORD containing offset of INCRAM
SeeAlso: AH=70h"TANDY"
--------V-1071------------------------------------
INT 10 - HUNTER 16 - DRAW LINE/BOX
AH = 71h
DS:BX -> control block (see #0107)
Desc: Draws a line or box. Only valid in graphics modes.
SeeAlso: AH=70h"HUNTER"

Format of HUNTER 16 control block:
Offset Size Description (Table 0107)
00h WORD left edge X co-ordinate
02h BYTE lower edge Y co-ordinate
03h WORD right edge X co-ordinate
05h BYTE upper edge Y co-ordinate
06h BYTE color (00h white, 01h black, FFh invert)
07h BYTE type (00h line, 01h box)
08h BYTE if non-zero (and type is BOX) fill with color
--------V-1072-------------------------------
INT 10 - VIDEO - TANDY 2000 only - SCROLL RIGHT PART OR ALL OF SCREEN
AH = 72h
AL = number of columns to shift scroll area, 00h to clear entire area
BH = new attributes for blanked columns at left
CH,CL = row, column of upper left corner of scroll area
DH,DL = row, column of lower right corner of scroll area
SeeAlso: AH=06h,AH=07h,AH=73h"TANDY",INT 15/AH=12h/BH=05h
--------V-1072------------------------------------
INT 10 - HUNTER 16 - SELECT TEXT-MODE INVERSE VIDEO MECHANISM
AH = 72h
AL = mechanism to use
00h do not use inverse video
01h emulate MDA. Display attribute 07h is normal video and 70h is
inverse video.
02h use inverse video if background is non-black.
03h use inverse video for high intensity text.
04h use inverse video for text with background intensity greater
than foreground intensity.
05h use inverse video for text with background color other than
black or high intensity foreground.
SeeAlso: AH=70h"HUNTER",AH=71h"HUNTER"
--------V-1073-------------------------------
INT 10 - VIDEO - TANDY 2000 only - SCROLL LEFT PART OR ALL OF SCREEN
AH = 73h
AL = number of columns to shift scroll area, 00h to clear entire area
BH = new attributes for blanked columns at right
CH,CL = row, column of upper left corner of scroll area
DH,DL = row, column of lower right corner of scroll area
SeeAlso: AH=06h,AH=07h,AH=72h"TANDY",INT 15/AH=12h/BH=05h
--------V-1073------------------------------------
INT 10 - HUNTER 16 - SELECT TEXT FONT
AH = 73h
AL = new font
00h 7x7 in a 8x8 cell
01h 5x7 in a 6x8 cell
06h 3x5 in a 4x6 cell
Retuen: BH = cell width
BL = cell height
SeeAlso: AH=60h"HUNTER",AH=77h"HUNTER"
--------V-1074------------------------------------
INT 10 - HUNTER 16 - SET LCD WINDOWS POSITION
AH = 74h
DH = row (0..24)
DL = column (0..79)
Desc: set the position in the virtual screen being displayed in the LCD
screen. If Split Screen (INT 10/AH=66h) is used, this call sets the
position for the window which has the cursor.
SeeAlso: AH=66h"HUNTER",AH=75h,AH=76h
--------V-1075------------------------------------
INT 10 - HUNTER 16 - SET ZOOM
AH = 75h
AL = new Zoom state (00h off, nonzero on)
SeeAlso: AH=74h,AH=76h
--------V-1076------------------------------------
INT 10 - HUNTER 16 - LOOKING KEYS
AH = 76h
AL = Action
00h home the window
01h move up one line
02h move down one line
03h move left one character
04h move right one character
05h flip window to other side of virtual screen
Desc: moves the displayed screen around the virtual screen
SeeAlso: AH=74h,AH=75h
--------V-1077------------------------------------
INT 10 - HUNTER 16 - GET GRAPHICS FONT
AH = 77h
Return: AL = font number (see #0108)
SeeAlso: AH=60h"HUNTER",AH=73h"HUNTER"

(Table 0108)
Values for HUNTER 16 graphics font number:
00h 7x7 in a 8x8 cell
01h 5x7 in a 6x8 cell
02h 7x9 in a 8x10 cell
03h 14x9 in a 16x10 cell
04h 7x18 in a 8x20 cell
05h 14x18 in a 16x20 cell
06h 3x5 in a 4x6 cell
Note: size is X * Y
--------V-1078------------------------------------
INT 10 - HUNTER 16 - TURN BACKLIGHT ON/OFF
AH = 78h
AL = new state of backlight (00h on, 01h off)
SeeAlso: AH=64h,INT 15/AH=74h
--------V-107F-------------------------------
INT 10 - Paradise SVGA - WD90C24 INSTALLATION CHECK
AH = 7Fh
Return: AX = 1234h if WD90C24 chip installed
--------V-107F00-----------------------------
INT 10 - SOLLEX SuperVGA - GET EXTENSIONS INFO
AX = 7F00h
Return: AL <> 7Fh if not supported
AL = 7Fh if supported
AH = status
00h successful
ES:DI -> info structure (see #0109)
01h failed
Program: the SOLLEX (Smos videO controLLer EXtensions) SuperVGA functions are
an extension to the VESA SuperVGA BIOS Extensions (see AX=4F00h) by
Seiko Epson Corporation intended to provided a standardized interface
to SuperVGA functionality not addressed by the VESA standard
SeeAlso: AX=4F00h

Format of SOLLEX SuperVGA info structure:
Offset Size Description (Table 0109)
00h DWORD pointer to VESA function dispatch table
04h DWORD pointer to SOLLEX function dispatch table
08h DWORD pointer to VESA SuperVGA info (see #0063 at AX=4F00h)
0Ch DWORD pointer to mode info structure table, consisting of
alternating ResInfo (see #0110) and VESA mode information
(see #0065 at AX=4F01h) blocks, terminated with an FFFFh word
10h DWORD pointer to font info structure table (see #0111)
14h WORD high resolution crystal frequency in Hz (0000h = not present)
16h DWORD pointer to ASCIZ ID string
1Ah DWORD pointer to timeout reset table
array of bytes, each a multiple of the minimum time increment
1Eh WORD minimum time increment in timer ticks
20h BYTE inverse options supported
bit 0: inverse supported
bits 1-7: reserved
21h BYTE normal color value
22h BYTE inverse color value
23h WORD port to be accessed for normal/inverse settings
25h WORD type of interface chip (currently undefined)
27h WORD program operational mode
bits 1-0: 00 no preference
01 terse (minimum detail in program messages)
10 verbose
11 use menus if supported, verbose mode otherwise
bits 7-2: reserved
29h WORD SOLLEX specification version
2Bh WORD version of VESA/SOLLEX implementation
2Dh DWORD offset to relocatable portion of SOLLEX extensions (for CONFIG)
2Eh DWORD offset to unused section of the extensions ROM
31h 16 BYTEs reserved
Note: all DWORD pointers initially require segment fixups; if the segment
is 0000h, it should be changed to the returned ES, otherwise it
may be assumed to be correct

Format of SOLLEX SuperVGA ResInfo:
Offset Size Description (Table 0110)
00h WORD 16-bit mode number
02h WORD adapter type (00h VGA, 01h EGA, 02h CGA, 03h MDA)
04h WORD display info (see #0114)
06h DWORD pointer to video parameter table
0Ah BYTE replacement entry in master Video Parameter
0Bh BYTE mode requested for mode set by BIOS
0Ch DWORD pointer to LoadReg table
10h BYTE index into table of clock values (see #0112)

Format of SOLLEX SuperVGA font info table [array] entry:
Offset Size Description (Table 0111)
00h BYTE required font height
01h BYTE parameter to load text mode font
02h BYTE parameter to load graphics mode font

(Table 0112)
Values for SOLLEX SuperVGA clock value index:
00h 25 MHz
01h 28 MHz
02h PCLK
03h 31.5 MHz (VESA 640x480)
04h reserved
05h 16 MHz (EGA)
06h PCLK
07h 24 MHz (EGA)
08h 25 MHz
09h 28 MHz
0Ah 36 MHz
0Bh 45 MHz (for 1024x768)
0Ch 80 MHz
0Dh 40 MHz
0Eh 65 MHz
0Fh 1 MHz (for powerdown)
--------V-107F00BX4000-----------------------
INT 10 - Diamond Stealth 24 - GET S3 INFORMATION BLOCK
AX = 7F00h
BX = 4000h
Return: AX = 007Fh if supported
DX:BX -> DAC set mode routine
SeeAlso: AX=7F00h/BX=4001h,AX=7F00h/BX=4002h
--------V-107F00BX4001-----------------------
INT 10 - Diamond Stealth 24 - GET LINEAR ADDRESS
AX = 7F00h
BX = 4001h
Return: AX = 007Fh if supported
CX = current linear address base (high word)
SeeAlso: AX=7F00h/BX=4000h,AX=7F00h/BX=4002h
--------V-107F00BX4002-----------------------
INT 10 - Diamond Stealth 24 - SET LINEAR ADDRESS
AX = 7F00h
BX = 4002h
CX = new linear address base (high word)
Return: AX = 007Fh if supported
SeeAlso: AX=7F00h/BX=4000h,AX=7F00h/BX=4001h
--------V-107F01BL00-------------------------
INT 10 - SOLLEX SuperVGA - ADAPTER CONTROL - SET ADAPTER
AX = 7F01h
BL = 00h
CX = adapter request (see #0113)
Return: AL <> 7Fh if not supported
AL = 7Fh if supported
AH = status
00h successful
01h failed
Note: initializes video hardware to a particular standard
SeeAlso: AX=7F00h,AX=7F01h/BL=01h,AX=7F01h/BL=02h

Bitfields for SOLLEX SuperVGA adapter request:
Bit(s) Description (Table 0113)
1-0 adapter type (00 VGA, 01 EGA, 10 CGA, 11 MDA)
2 reserved
4-3 change displays (00 none, 01 analog 10 digital 11 panel)
6-5 desired monitor sense (01 color, 10 mono, 11=8514)
7 lock override
8 alternate adapter mode
15-9 reserved
--------V-107F01BL01-------------------------
INT 10 - SOLLEX SuperVGA - ADAPTER CONTROL - GET ADAPTER
AX = 7F01h
BL = 01h
Return: AL <> 7Fh if not supported
AL = 7Fh if supported
AH = status
00h successful
01h failed
BX = adapter type (see #0113)
DX = display type (see #0114)
SeeAlso: AX=7F00h,AX=7F01h/BL=00h,AX=7F01h/BL=02h

Bitfields for SOLLEX SuperVGA display type:
Bit(s) Description (Table 0114)
15-9 reserved
8 alternate display active
7 Enhanced Color Display monitor active
6 multi-frequency digital monitor active
5 PS/2-type monitor active
4 plasma/electroluminescent panel active
3 LCD panel active
2 multi-frequency analog monitor active
1-0 monitor sense (00 none, 01 color, 10 mono, 11=8514)
--------V-107F01BL02-------------------------
INT 10 - SOLLEX SuperVGA - ADAPTER CONTROL - DETERMINE ADAPTER SUPPORT
AX = 7F01h
BL = 02h
CX = adapter request (see #0113)
Return: AL <> 7Fh if not supported
AL = 7Fh if supported
AH = status
00h requested setting can successfully be made
01h requested setting not available in this configuration
SeeAlso: AX=7F00h,AX=7F01h/BL=00h
--------V-107F02BL00-------------------------
INT 10 - SOLLEX SuperVGA - DISPLAY OUTPUT CONTROL - SET DISPLAY OUTPUT
AX = 7F02h
BL = 00h
CX = display output setting (see #0115)
Return: AL <> 7Fh if not supported
AL = 7Fh if supported
AH = status
00h successful
01h failed
SeeAlso: AX=7F00h,AX=7F02h/BL=00h

Bitfields for SOLLEX SuperVGA display output setting:
Bit(s) Description (Table 0115)
0 CRTC control in 2,1 valid
1 enable digital output
2 enable analog output
3 panel control in 5,4 valid
4 enable LCD output
5 enable plasma/EL output
6 inverse control in 7 valid
7 0=normal, 1=inverse
15-8 reserved
--------V-107F02BL01-------------------------
INT 10 - SOLLEX SuperVGA - DISPLAY OUTPUT CONTROL - GET DISPLAY OUTPUT
AX = 7F02h
BL = 01h
Return: AL <> 7Fh if not supported
AL = 7Fh if supported
AH = status
00h successful
BX = display output setting (see #0115)
CX = displays attached (see #0116)
01h failed
SeeAlso: AX=7F00h,AX=7F02h/BL=00h

Bitfields for SOLLEX SuperVGA displays attached:
Bit(s) Description (Table 0116)
0 PS/2 display on analog output
1 multi-frequency monitor on analog output
2 LCD panel attached
3 plasma/electroluminescent panel attached
4 multi-frequency monitor on digital output
5 Enhanced Color Display attached to digital outpt
6 alternate display
15-7 reserved
--------V-107F03BL00-------------------------
INT 10 - SOLLEX SuperVGA - VIDEO SUPPORT CONTROL - GET SUPPORT INFO
AX = 7F03h
BL = 00h
CX = support type
0000h VGA, 0001h EGA, 0002h CGA, 0003h MDA, 0004h extensions,
0005h-0012h reserved for SOLLEX, 0013h Hercules,
0014h-001Fh reserved for SOLLEX, 0020h-00FFh reserved for OEM
Return: AL <> 7Fh if not supported
AL = 7Fh if supported
AH = status
00h successful
CX = size of video support code
DX = segment of physical video support (0000h if no ROM)
ES = segment of active video support
ES:DI -> information block (DI = 0000h if none available)
01h failed
SeeAlso: AX=7F03h/BL=01h
--------V-107F03BL01-------------------------
INT 10 - SOLLEX SuperVGA - VIDEO SUPPORT CONTROL - INITIALIZE VIDEO SUPPORT
AX = 7F03h
BL = 01h
CX = support request
ES = segment of support code
Return: AL <> 7Fh if not supported
AL = 7Fh if supported
AH = status
00h successful
01h failed
Note: initializes the indicated video support by calling ES:0003h; this
function may be used to switch the active video support back to
ROM after AX=7F03h/BL=02h
SeeAlso: AX=7F03h/BL=00h
--------V-107F03BL02-------------------------
INT 10 - SOLLEX SuperVGA - VIDEO SUPPORT CONTROL - GO RAM RESIDENT
AX = 7F03h
BL = 02h
CX = support request
ES = destination segment
Return: AL <> 7Fh if not supported
AL = 7Fh if supported
AH = status
00h successful
01h failed
SeeAlso: AX=7F00h,AX=7F03h/BL=01h
--------V-107F04BL00-------------------------
INT 10 - SOLLEX SuperVGA - POWER CONTROL - SET POWER STATE
AX = 7F04h
BL = 00h
CX = new power state
Return: AL <> 7Fh if not supported
AL = 7Fh if supported
AH = status
00h successful
01h failed
Note: higher values progressively reduce the operations available on the
video adapter while yielding increasing power savings
SeeAlso: AX=7F00h,AX=7F04h/BL=01h
--------V-107F04BL01-------------------------
INT 10 - SOLLEX SuperVGA - POWER CONTROL - GET POWER STATE
AX = 7F04h
BL = 01h
Return: AL <> 7Fh if not supported
AL = 7Fh if supported
AH = status
00h successful
CX = current power state
DX = maximum state
01h failed
SeeAlso: AX=7F00h,AX=7F04h/BL=00h
--------V-107F04BL02-------------------------
INT 10 - SOLLEX SuperVGA - POWER CONTROL - SET TIMEOUT RESET
AX = 7F04h
BL = 02h
CX = timeout reset
Return: AL <> 7Fh if not supported
AL = 7Fh if supported
AH = status
00h successful
01h failed
SeeAlso: AX=7F00h,AX=7F04h/BL=03h
--------V-107F04BL03-------------------------
INT 10 - SOLLEX SuperVGA - POWER CONTROL - GET TIMEOUT RESET
AX = 7F04h
BL = 03h
Return: AL <> 7Fh if not supported
AL = 7Fh if supported
AH = status
00h successful
BX = time increment
CX = current timeout reset
DX = maximum timeout reset
ES:DI -> timeout reset table (array of bytes)
01h failed
Note: the timeout period is computed as (BYTE ES:[DI+CX]) * BX timer ticks
SeeAlso: AX=7F00h,AX=7F04h/BL=02h
--------V-107F05-----------------------------
INT 10 - SOLLEX SuperVGA - LOAD REGISTER
AX = 7F05h
ES:DI -> register value table (see #0117)
Return: AL <> 7Fh if not supported
AL = 7Fh if supported
AH = status
00h successful
01h failed
SeeAlso: AH=F1h,AH=F3h,AH=F5h

Format of SOLLEX SuperVGA register value table:
Offset Size Description (Table 0117)
00h WORD base I/O register (FFFFh = end of list)
02h 2N BYTEs pairs of values to be written to the base I/O register as an
index value and the following register as a data byte
2N+2 WORD FFFFh (end of data list)
... (repeats until FFFFh base address)
--------V-107F06-----------------------------
INT 10 - SOLLEX SuperVGA - MULTIPLE FONT CONTROL
AX = 7F06h
BL = subfunction
00h set multiple font state
CX = new state (00h off, 01h on)
01h get multiple font state
Return: BL = current state (00h off, 01h on)
Return: AL <> 7Fh if not supported
AL = 7Fh if supported
AH = status
00h successful
01h failed
SeeAlso: AH=11h
--------V-107F07-----------------------------
INT 10 - SOLLEX SuperVGA - FILL VIDEO RAM
AX = 7F07h
BL = how much to fill
00h regen size
01h all video memory
CX = pattern to write (normally 0720h for text modes and 0000h for gr)
Return: AL <> 7Fh if not supported
AL = 7Fh if supported
AH = status
00h successful
01h failed
SeeAlso: AH=06h
--------A-1080-------------------------------
INT 10 - CU Writer v1.4 - GET OPTION
AH = 80h
AL = desired option
Return: ???
Program: CU Writer is a public-domain Thai-English word processor from
Chulalongkorn University, Bangkok
SeeAlso: AH=81h"CU Writer"
--------Q-1080--DX4456-----------------------
INT 10 U - VIDEO - DESQview 2.0x only - internal - SET ??? HANDLER
AH = 80h
DX = 4456h ('DV')
ES:DI -> FAR subroutine to be called on ???
Return: DS = segment of DESQview data structure for video buffer
Note: this function is probably meant for internal use only, due to the magic
value required in DX
the subroutine seems to be called when the DESQview menu is accessed;
on entry, AL = 03h or 04h
--------A-1081-------------------------------
INT 10 - CU Writer v1.4 - SET OPTION
AH = 81h
???
Return: ???
SeeAlso: AH=80h"CU Writer"
--------Q-1081--DX4456-----------------------
INT 10 U - VIDEO - DESQview 2.0x only - internal - GET ???
AH = 81h
DX = 4456h ('DV')
Return: ES = segment of DESQview data structure for video buffer
BYTE ES:[0] = current window number in DV 2.0x
Note: this function is probably meant for internal use only, due to the magic
value required in DX
SeeAlso: AH=82h"DESQview"
--------Q-1082--DX4456-----------------------
INT 10 U - VIDEO - DESQview 2.0x only - internal - GET CURRENT WINDOW INFO
AH = 82h
DX = 4456h ('DV')
Return: DS = segment in DESQview for data structure
in DV 2.00,
BYTE DS:[0] = window number
WORD DS:[1] = segment of other data structure
WORD DS:[3] = segment of window's object handle
ES = segment of DESQview data structure for video buffer
AL = current window number
AH = ???
BL = direct screen writes
00h program does not do direct writes
01h program does direct writes, so shadow buffer not usable
BH = ???
CL = current video mode
CH = ???
Note: this function is probably meant for internal use only, due to the magic
value required in DX
SeeAlso: AH=81h"DESQview"
--------J-108200-----------------------------
INT 10 - VIDEO - AX PC - GET/SET SCROLL MODE
AX = 8200h
BL = new scroll mode or FFh to get current mode
00h dynamic, 01h software
Return: AL = scroll mode (current mode if BL=FFh, previous mode otherwise)
SeeAlso: AH=06h,AH=07h
--------J-108300-----------------------------
INT 10 - VIDEO - AX PC - GET VIDEO RAM ADDRESS
AX = 8300h
Return: AX = offset of video RAM
ES:BX -> virtual text RAM buffer
SeeAlso: AX=5201h
--------N-108B-------------------------------
INT 10 - Alloy MW386 - FORCE WORKSTATION SCREEN UPDATE
AH = 8Bh
SeeAlso: AH=92h,AH=93h
--------N-1090-------------------------------
INT 10 - Alloy MW386 - GET PHYSICAL WORKSTATION DISPLAY MODE
AH = 90h
Return: AL = current video mode (see #0009 at AH=00h)
SeeAlso: AH=91h
--------N-1091-------------------------------
INT 10 - Alloy MW386 - GET PHYSICAL WORKSTATION ADAPTER TYPE
AH = 91h
Return: AL = video adapter type (see #0118)
Note: types less than 80h do not imply that the current user is on the host
SeeAlso: AH=90h

(Table 0118)
Values for Alloy MW386 video adapter type:
00h monochrome
01h Hercules monochrome graphics
02h CGA
03h EGA
04h VGA
80h monochrome text terminal
81h Hercules graphics terminal
82h color graphics terminal

--------N-1092-------------------------------
INT 10 - Alloy MW386 - INHIBIT WORKSTATION SCREEN UPDATES
AH = 92h
Note: the terminal will be updated even when screen updates are inhibited if
TTY output is used
SeeAlso: AH=8Bh
--------N-1093-------------------------------
INT 10 - Alloy MW386 - REDRAW SCREEN
AH = 93h
SeeAlso: AH=8Bh,AH=FFh
--------A-10A0-------------------------------
INT 10 - CU Writer v1.4 - SET PIXEL WRITE MODE
AH = A0h
???
Return: ???
Program: CU Writer is a public-domain Thai-English word processor from
Chulalongkorn University, Bangkok
SeeAlso: AH=80h"CU Writer",AH=B0h
--------p-10A0-------------------------------
INT 10 - ATI Mach64 BIOS - Display Power Management Signalling API???
AH = A0h
AL = function (00h-13h)
???
Return: AH = status
00h successful
01h failed
???
SeeAlso: AX=4F10h/BL=00h
--------V-10A004-----------------------------
INT 10 - PhoenixVIEW/LC - VIDEO DISPLAY TYPE
AX = A004h
???
Return: ???
Desc: configure display parameters
SeeAlso: AX=A01Bh"PhoenixVIEW/LC"
--------p-10A00C-----------------------------
INT 10 - ATI Mach64 BIOS - SET SLEEP MODE
AX = A00Ch
CL = new state
01h standby
02h suspend
03h off
Return: AH = status
00h successful
01h failed
SeeAlso: AX=4F00h,AX=4F10h/BL=01h
--------V-10A01B-----------------------------
INT 10 - PhoenixVIEW/LC - CRT MONITOR DETECTION
AX = A01Bh
???
Return: ???
Desc: determine whether an external display is currently attached
SeeAlso: AX=A004h"PhoenixVIEW/LC"
--------A-10B0-------------------------------
INT 10 - CU Writer v1.4 - PUT PIXEL
AH = B0h
???
Return: ???
SeeAlso: AH=A0h"CU Writer",AH=B1h,AH=B2h,AH=B3h,AH=B4h,AH=B5h,AH=D0h
--------A-10B1-------------------------------
INT 10 - CU Writer v1.4 - MOVE TO
AH = B1h
???
Return: ???
SeeAlso: AH=B0h,AH=B2h,AH=C0h"CU Writer"
--------A-10B2-------------------------------
INT 10 - CU Writer v1.4 - DRAW LINE TO
AH = B2h
???
Return: ???
SeeAlso: AH=B0h,AH=B1h,AH=B3h,AH=B4h,AH=B5h
--------A-10B3-------------------------------
INT 10 - CU Writer v1.4 - FLOOD FILL
AH = B3h
???
Return: ???
SeeAlso: AH=B2h,AH=B5h
--------A-10B4-------------------------------
INT 10 - CU Writer v1.4 - DRAW RECTANGLE
AH = B4h
???
Return: ???
SeeAlso: AH=B0h,AH=B2h,AH=B3h,AH=B5h
--------A-10B5-------------------------------
INT 10 - CU Writer v1.4 - DRAW FILLED RECTANGLE
AH = B5h
???
Return: ???
SeeAlso: AH=B0h,AH=B2h,AH=B3h,AH=B4h
--------V-10BD44-----------------------------
INT 10 U - Compaq QVision - ???
AX = BD44h
???
Return: ???
Note: called by Compaq's MTX132.COM, which places the QVision in 132-column
mode
--------V-10BF--CX0000-----------------------
INT 10 - Athena Digital HGCIBM.COM - INSTALLATION CHECK
AH = BFh
CX = 0000h (???)
Return: CX = 0202h
DL = ??? (internal data, possibly version number)
--------b-10BF00-----------------------------
INT 10 - VIDEO - Compaq Extensions - SELECT EXTERNAL MONITOR
AX = BF00h
Desc: specify that the external monitor become the active monitor
Note: all registers preserved and the internal monitor is blanked
SeeAlso: AX=BF01h,AX=BF12h
--------b-10BF01-----------------------------
INT 10 - VIDEO - Compaq Extensions - SELECT INTERNAL MONITOR
AX = BF01h
Desc: specify that the internal monitor become the active monitor
Note: all registers preserved and the external monitor is blanked
SeeAlso: AX=BF00h,AX=BF12h
--------b-10BF02-----------------------------
INT 10 - VIDEO - Compaq Extensions - SET MASTER MODE OF CURRENT CONTROLLER
AX = BF02h
BH = master mode
04h CGA
05h EGA
07h MDA
SeeAlso: AX=BF03h
--------b-10BF03BX0000-----------------------
INT 10 - VIDEO - Compaq Extensions - GET ENVIRONMENT
AX = BF03h
BX = 0000h
Return: BH = active monitor
(00h = external, 01h = internal, 03h both, 04h neither)
BL = master mode (see #0119)
CH = ASIC type and version
00h (reserved, very early Compaq VGCs)
31h if QVision VGA
CL = switchable VDU modes supported (see #0120)
DH = internal monitor type (see #0121)
DL = external monitor type (see #0121)
SeeAlso: AX=1A00h,AX=BF00h,AX=BF01h,AX=BF02h,AX=BF11h

(Table 0119)
Values for Compaq video master mode:
00h switchable VDU not present
04h CGA
05h EGA
07h MDA
08h switchable LCD controller present
09h plasma VGA
0Ah TFT (active-matrix) VGA

Bitfields for Compaq switchable VDU modes support:
Bit(s) Description (Table 0120)
0 CGA supported
1,2 reserved (1)
3 MDA supported
4 BitBLT engine available
5 132-column support availble
6 640x480x256 mode available
7 8-bit DAC mode available

(Table 0121)
Values for Compaq monitor type:
00h none
01h dual-mode monitor
02h 5153 RGB monitor (RGBI 16-color)
03h Compaq Color monitor
04h 640x400 flat panel (Plasma CGA)
05h VGC monochrome
06h VGC color
07h 8-level mono LCD VGA (internal)
1024x768 mono VGA (external)
08h 16-level mono plasma VGA (internal)
1024x768 color VGA (external)
09h 4-level mono LCD CGA
0Ah 16-level mono LCD VGA
0Bh active-matrix color VGA
0Ch active-matrix mono VGA
0Dh STN color VGA
--------b-10BF04-----------------------------
INT 10 - VIDEO - Compaq Extensions - SET MODE SWITCH DELAY
AX = BF04h
BH = new state of delay (00h enabled, 01h disabled)
Note: the 04/08/93 sytem ROM appears to use BL instead of BH; a future
version of the list will provide more definite information
SeeAlso: AX=BF05h
--------b-10BF05-----------------------------
INT 10 - VIDEO - Compaq Extensions - ENABLE/DISABLE DISPLAY
AX = BF05h
BH = new state of video
00h off
01h on
Note: the 04/08/93 sytem ROM appears to use BL instead of BH; a future
version of the list will provide more definite information
SeeAlso: AH=12h/BL=36h,AX=BF04h
--------b-10BF06-----------------------------
INT 10 - VIDEO - Compaq SLT/286 - READ GRAY SCALE TABLE
AX = BF06h
CL = address to be read from gray scale table
Return: AL = bit 3-0 - Value read from gray scale table
CL = address to be read from gray scale table
SeeAlso: AH=12h/BL=33h,AX=BF07h
--------b-10BF07-----------------------------
INT 10 - VIDEO - Compaq SLT/286 - WRITE GRAY SCALE TABLE
AX = BF07h
CH = value to write to gray scale table
CL = address to be written to gray scale table
SeeAlso: AX=BF06h,AX=BF08h
--------b-10BF08-----------------------------
INT 10 - VIDEO - Compaq SLT/286 - WRITE COLOR MIX REGISTERS
AX = BF08h
CH = bits 7-4 green weight
bits 3-0 blue weight
CL = bits 7-4 unused
bits 3-0 red weight
SeeAlso: AH=12h/BH=33h,AX=BF07h
--------b-10BF09-----------------------------
INT 10 - VIDEO - Compaq Extensions - TURN ON REVERSE VIDEO
AX = BF09h
Return: CF clear
Notes: sets bit 6 of port 03CEh index 81h; in some cases also sets index 84h
to 6Fh and index 83h to 04h
supported by at least the QVision board and the LTE Lite ROM BIOS
SeeAlso: AX=BF0Ah,AX=BF0Bh
--------b-10BF0A-----------------------------
INT 10 - VIDEO - Compaq Extensions - TURN OFF REVERSE VIDEO
AX = BF0Ah
Return: CF clear
Notes: clears bit 6 of port 03CEh index 81h; in some cases also sets index 84h
to 80h and index 83h to FBh
supported by at least the QVision board and the LTE Lite ROM BIOS
SeeAlso: AX=BF09h,AX=BF0Bh
--------b-10BF0B-----------------------------
INT 10 - VIDEO - Compaq Extensions - CHECK WHETHER VIDEO REVERSED
AX = BF0Bh
Return: CF clear
AX = state (0000h normal video, 0001h reverse video)
Note: supported by at least the QVision board and the LTE Lite ROM BIOS
SeeAlso: AX=BF09h,AX=BF0Ah
--------b-10BF0C-----------------------------
INT 10 - VIDEO - Compaq Extensions - SET DAC 6-BIT MODE
AX = BF0Ch
Return: CF clear
Desc: specify that video DAC registers use only six bits of color info
Note: supported by at least the QVision board and the SystemPro XL ROM BIOS
SeeAlso: AX=BF0Dh,AX=BF0Eh
--------b-10BF0D-----------------------------
INT 10 - VIDEO - Compaq Extensions - SET DAC 8-BIT MODE
AX = BF0Dh
Return: CF clear
Desc: specify that video DAC registers use all eight bits of color info
Note: supported by at least the QVision board and the SystemPro XL ROM BIOS
SeeAlso: AX=BF0Ch,AX=BF0Eh
--------b-10BF0E-----------------------------
INT 10 - VIDEO - Compaq Extensions - CHECK DAC 6-BIT/8-BIT mode
AX = BF0Eh
Return: CF clear
AL = DAC mode
00h in 6-bit mode
01h in 8-bit mode
Note: supported by at least the QVision board and the SystemPro XL ROM BIOS
SeeAlso: AX=BF0Ch,AX=BF0Dh
--------b-10BF0F-----------------------------
INT 10 - VIDEO - Compaq Extensions - SET HIGH ADRESS MAP REGISTER
AX = BF0Fh
BX = high address map location in megabytes, or
0000h to disable high address map, or
FFFFh to let ROM configure high address map
Return: CF clear
AX = previous value of high address map register
Notes: supported by at least the QVision board and the SystemPro XL and LTE
Lite ROM BIOSes
SeeAlso: AX=BF10h
--------b-10BF10-----------------------------
INT 10 - VIDEO - Compaq Extensions - GET HIGH ADDRESS MAP REGISTER
AX = BF10h
Return: CF clear
AX = current value of high address map register
Notes: supported by at least the QVision board and the SystemPro XL and LTE
Lite ROM BIOSes
the Compaq QVision documentation (October 1993) says the value is
returned in BX, but this appears to be one of many typos
SeeAlso: AX=BF0Fh
--------b-10BF11-----------------------------
INT 10 - VIDEO - Compaq Extensions - GET EXTENDED ENVIRONMENT
AX = BF11h
Return: AL = BFh if supported
CF clear
ES:DI -> ASCII signature "COMPAQ"
ES:SI -> advanced functionality table (see #0122)
Note: supported by at least the QVision board and the LTE Lite and ProSignia
ROM BIOSes
SeeAlso: AX=1A00h,AX=BF03h

Bitfields for Compaq advanced video functionality:
Bit(s) Description (Table 0122)
31 future graphics extensions (reserved, set to 0)
30-16 reserved
15-12 available video memory in 256K blocks, less one (0000 = 256K, etc.)
11-8 reserved
7 QVision modes supported
6 Advanced VGA modes supported
5 Accelerated VGA modes supported
4 standard VGA modes supported
3-2 reserved
1 132-column modes supported
0 reserved
--------b-10BF12-----------------------------
INT 10 - VIDEO - Compaq Extensions - NEW ACTIVE MONITOR
AX = BF12h
BH reserved
BL = function mask (see #0123)
Return: CF clear
Notes: this function is a NOP if the VGA subsystem is inactive or the current
Display Combination Code is 10h or higher
supported by at least the QVision board and the LTE Lite and ProSignia
ROM BIOSes
SeeAlso: AX=BF01h,AX=BF02h

Bitfields for function mask:
Bit(s) Description (Table 0123)
7 command mode
if set, bits 1 and 0 make the monitor active when set
if clear, bits 1 and 0 toggle the monitor's state when set
6-2 reserved
1 internal monitor
0 external monitor
--------b-10BF13-----------------------------
INT 10 - VIDEO - Compaq QVision - GAMMA CORRECTION
AX = BF13h
BL = subfunction
00h load gamma correction table for true-color mode
DS = BIOS data segment
01h set palette RAM bypass
BH = 00h
Return: nothing
Note: these functions must be called after a video mode set, and are in
effect only for the current video mode
--------V-10BFA0BXADAD-----------------------
INT 10 - VIDEO - Compaq ADAPT.COM - INSTALLATION CHECK
AX = BFA0h
BX = ADADh
Return: AX = BDBDh if newer ADAPT.COM installed
BX = BCD version (BH = major, BL = minor)
CL = ???
CH = ???
DL = ???
AX = ADADh if older version of ADAPT.COM installed
Program: ADAPT is Compaq's Advanced Display Attribute Programming Tool, an
optionally-resident utility for setting display colors and cursor
size; when resident, it also includes a screen blanker
SeeAlso: AX=BFA1h,AX=BFA2h,AX=DFA5h
Index: screen saver;ADAPT
--------V-10BFA1-----------------------------
INT 10 - VIDEO - Compaq ADAPT.COM - GET ???
AX = BFA1h
Return: AX = BDBEh if supported
CH = current value of ???
DL = current value of ???
SeeAlso: AX=BFA0h,AX=BFA2h
--------V-10BFA2-----------------------------
INT 10 - VIDEO - Compaq ADAPT.COM - SET ???
AX = BFA2h
CH = new value for ???
DL = new value for ???
Return: AX = BDBEh if supported
SeeAlso: AX=BFA0h,AX=BFA1h
--------A-10C0-------------------------------
INT 10 - CU Writer v1.4 - GO TO TEXT ROW AND COLUMN
AH = C0h
???
Return: ???
SeeAlso: AH=B1h,AH=C1h,AH=C2h,AH=C3h,AH=C4h
--------A-10C1-------------------------------
INT 10 - CU Writer v1.4 - OUTPUT TEXT
AH = C1h
???
Return: ???
SeeAlso: AH=C0h,AH=C2h,AH=C3h,AH=C4h
--------A-10C2-------------------------------
INT 10 - CU Writer v1.4 - REVERSE TEXT
AH = C2h
???
Return: ???
SeeAlso: AH=C0h,AH=C1h,AH=C3h,AH=C4h
--------A-10C3-------------------------------
INT 10 - CU Writer v1.4 - TEXT BAR
AH = C3h
???
Return: ???
SeeAlso: AH=C0h,AH=C1h,AH=C4h
--------A-10C4-------------------------------
INT 10 - CU Writer v1.4 - TEXT MENU
AH = C4h
???
Return: ???
SeeAlso: AH=C0h,AH=C1h,AH=C3h,AH=D0h
--------V-10CB00-----------------------------
INT 10 - UNCHAIN - SAVE CURRENT VGA REGISTERS
AX = CB00h
Note: combined with AX=CB06h, this function permits the use of video mode
13h together with the VGA's unchained mode
SeeAlso: AX=CB06h,AX=CBFFh
--------V-10CB01-----------------------------
INT 10 - UNCHAIN - UPDATE PAGE 1 OFFSET
AX = CB01h
BX = offset of page 1
Desc: inform UNCHAIN of the location of video page 1 in video memory; the
default is 0000h
SeeAlso: AX=CB02h,AX=CB03h,AX=CB04h,AX=CBFFh
--------V-10CB02-----------------------------
INT 10 - UNCHAIN - UPDATE PAGE 2 OFFSET
AX = CB02h
BX = offset of page 2
Desc: inform UNCHAIN of the location of video page 2 in video memory; the
default is 3E80h (16000, for 320x200)
SeeAlso: AX=CB00h,AX=CB01h,AX=CB03h,AX=CB04h
--------V-10CB03-----------------------------
INT 10 - UNCHAIN - UPDATE PAGE 3 OFFSET
AX = CB03h
BX = offset of page 3
Desc: inform UNCHAIN of the location of video page 3 in video memory; the
default is 7D00h (32000, for 320x200)
SeeAlso: AX=CB01h,AX=CB02h,AX=CB04h
--------V-10CB04-----------------------------
INT 10 - UNCHAIN - UPDATE PAGE 4 OFFSET
AX = CB04h
BX = offset of page 4
Desc: inform UNCHAIN of the location of video page 4 in video memory; the
default is BB80h (48000, for 320x200)
SeeAlso: AX=CB01h,AX=CB02h,AX=CB03h,AX=CB05h
--------V-10CB05-----------------------------
INT 10 - UNCHAIN - SAVE PALETTE
AX = CB05h
SeeAlso: AX=CB00h,AX=CB06h
--------V-10CB06-----------------------------
INT 10 - UNCHAIN - RESTORE VGA REGISTERS
AX = CB06h
SeeAlso: AX=CB00h,AX=CB05h,AX=CBFFh
--------V-10CBFF-----------------------------
INT 10 - UNCHAIN - INSTALLATION CHECK
AX = CBFFh
Return: AX = CCBBh if installed
Program: UNCHAIN is a TSR by Colin Buckley which permits use of Borland
development tools with Mode X video in the absence of a second
monitor
SeeAlso: AX=CB00h,AX=CB01h,AX=CB06h
--------V-10CC00-----------------------------
INT 10 - VIDEO - UltraVision - GET STATUS (INSTALLATION CHECK)
AX = CC00h
SI = magic value 0000h (if checking version)

Return: CX = product signature
ABCDh UltraVision
5546h ('UF') UltraFont
AL = Ultravision extensions
00h enabled
FFh disabled
AH = card designator
BX:00F0h -> palette values (for compatibility with NEWFONT)
DX = support for high resolution modes
00h not active
01h active
SI = UltraVision version number (v1.2+), high byte=major,low byte=minor
unchanged for versions <1.2
Note: UltraFont is a simplified version of UltraVision for Toshiba;
only the signature in CX and the status in AL will be returned
SeeAlso: AX=CC01h,AX=CC02h
--------V-10CC01-----------------------------
INT 10 - VIDEO - UltraVision - DISABLE EXTENSIONS
AX = CC01h
Notes: subsequent BIOS calls will be passed through to previous handler
should be followed immediately by mode set to restore normal EGA/VGA
state
SeeAlso: AX=CC02h
--------V-10CC02-----------------------------
INT 10 - VIDEO - UltraVision - ENABLE EXTENSIONS
AX = CC02h
Note: should be followed immediately by mode set to restore previous
UltraVision state
SeeAlso: AX=CC01h
--------V-10CD00-----------------------------
INT 10 - VIDEO - UltraVision - LOAD ULTRAVISION PALETTE (color EGA,VGA)
AX = CD00h
CL = palette table number (01h-07h for v1.x, 01h-0Fh for v2+)
DS:DX -> 16-byte palette register list (colors for registers 00h-0Fh)
Notes: if palette locking is in effect for the current mode, the new colors
will be displayed immediately; otherwise, the system reverts to the
default palette
palette table 0 is reserved for the default palette and cannot be set
UltraVision always sets the border color to black
SeeAlso: AX=CD01h,AX=CD02h
--------V-10CD01-----------------------------
INT 10 - VIDEO - UltraVision - SET PALETTE LOCKING STATUS (color EGA,VGA)
AX = CD01h
CL = palette locking value
00h none
01h text modes only (02h,03h)
FFh all modes (all standard color text and graphics modes)
Notes: intended for video modes with 16 or fewer colors
SeeAlso: AX=1000h,AX=1002h,AX=CD00h,AX=CD03h
--------V-10CD02-----------------------------
INT 10 - VIDEO - UltraVision - GET ULTRAVISION PALETTE (EGA,VGA)
AX = CD02h
Return: CL = palette table number
DS:DX -> 17-byte palette register list (see #0124)
DS:SI -> current font names table (see #0125,#0126)
Note: only the font names are valid on monochrome EGA systems
SeeAlso: AX=1009h,AX=CD00h

Format of UltraVision palette register list:
Offset Size Description (Table 0124)
00h 16 BYTEs colors for palette registers 00h through 0Fh
10h BYTE border color

Format of UltraVision v2+ current font names table:
Offset Size standard EGA HiRes EGA VGA (Table 0125)
00h 8 BYTEs N/A F19 font F20 font
08h 8 BYTEs F14 font F14 font F14 font
10h 8 BYTEs N/A F11 font F10 font
18h 8 BYTEs F8 font F8 font F8 font

Format of UltraVision v1.x current font names table:
Offset Size HiRes EGA (Table 0126)
00h 8 BYTEs F19/F14 font
08h 8 BYTEs F11/F8 font
--------V-10CD03-----------------------------
INT 10 - VIDEO - UltraVision - GET PALETTE LOCKING STATUS (color EGA,VGA)
AX = CD03h
Return: CL = palette locking value
00h none
01h text modes only
FFh all modes
SeeAlso: AX=CD01h
--------V-10CD04-----------------------------
INT 10 - VIDEO - UltraVision - GET UltraVision TEXT MODE (EGA,VGA)
AX = CD04h
Return: AL = mode number (see #0127)
SeeAlso: AH=0Fh,AX=CC00h,AH=CDh

(Table 0127)
Values for UltraVision video mode number:
11h 80x25
12h 80x43, 80x50
13h 80x34, 80x36
14h 80x60, 80x63
19h 94x25
1Ah 94x43, 94x50
1Bh 94x36
1Ch 94x63
21h 108x25
22h 108x43, 108x50
23h 107x34, 108x36
24h 108x60, 108x63
31h 120x25
32h 120x43, 120x50
33h 132x25
34h 132x44, 132x50
39h 120x36
3Ah 120x63
3Bh 132x36
3Ch 132x60
Index: video modes;UltraVision
--------V-10CD05-----------------------------
INT 10 - VIDEO - UltraVision - SET CURSOR TYPE (EGA,VGA)
AX = CD05h
CL = type
00h line cursor
FFh box cursor
Note: sets default cursor type for text-based programs
SeeAlso: AH=01h,AX=CD06h
--------V-10CD06-----------------------------
INT 10 - VIDEO - UltraVision - GET CURSOR TYPE (EGA,VGA)
AX = CD06h
Return: CL = type
00h line cursor
FFh box cursor
SeeAlso: AH=03h,AX=CD05h
--------V-10CD07-----------------------------
INT 10 - VIDEO - UltraVision v1.2+ - SET UNDERLINE STATUS (EGA,VGA)
AX = CD07h
CL = hardware underline status (see #0128)
BL = foreground color for normal text (FFh = current)
BH = foreground color for bright text (FFh = current)
Return: CL = hardware underline status
BL = current foreground color for normal text
BH = current foreground color for bright text
Notes: when underline or strikeout is enabled in color text modes, the
specified colors will be assigned temporarily to colors 01h and 09h,
allowing affected text to match non-underlined text. The color
remapping uses values from the current onscreen palette regardless
of the palette locking status (see AX=CD01h)
specify the standard colors (BL=01h,BH=09h) to enable underline or
strikeout without color remapping
SeeAlso: AX=CD08h

(Table 0128)
Values for hardware underline status:
00h off (color systems only)
01h underline below characters
02h strike through characters
--------V-10CD08-----------------------------
INT 10 - VIDEO - UltraVision v1.2+ - GET UNDERLINE STATUS (EGA,VGA)
AX = CD08h
Return: CL = hardware underline status (see #0128)
BL = foreground color for normal text
BH = foreground color for bright text
Note: only CL is valid on monochrome EGA systems
SeeAlso: AX=CD07h
--------V-10CD10-----------------------------
INT 10 - VIDEO - UltraVision - LOAD USER FONT (EGA,VGA)
AX = CD10h
BH = bytes per character (08h,0Ah,0Bh,0Eh,13h,14h)
CX = ABCDh load 9xN alternate font (v2+)
else number of characters to load
DX = character offset into font table
DS:SI -> 8-byte ASCII font name
ES:BP -> font definitions
Return: AX = FFFFh if invalid font parameters
Notes: loads the designated characters into UltraVision's resident font area
should be followed by a video mode set to reload character generator
SeeAlso: AX=1100h
--------V-10CD-------------------------------
INT 10 - VIDEO - UltraVision - SET ULTRAVISION TEXT MODE (EGA,VGA)
AH = CDh
AL = text mode number (see #0127)
Return: AX = CDCDh if invalid mode
SeeAlso: AX=CD04h
--------A-10D0-------------------------------
INT 10 - CU Writer v1.4 - LOAD PICTURE
AH = D0h
???
Return: ???
SeeAlso: AH=B0h"CU Writer",AH=C4h
--------V-10D0-------------------------------
INT 10 U VIDEO - HP 100LX/200LX - SET ZOOM MODE
AH = D0h
AL = zoom mode
02h 80x25 mono
03h 80x25 color
80h 64x18 mono
81h 64x18 color
82h 40x25 mono
83h 40x25 color
84h 40x16 mono
85h 40x16 color
Note: zoom mode can only be changed within zoom modes of the same color
scheme; if needed, set to mono/color with AH=00h,AL=02h/03h; with
mono video modes AL=07h or AL=21h only 80x25 and 40x16 will work
the current zoom mode is stored in the BIOS data area at 0040h:009Fh
SeeAlso: AH=D1h,AH=D4h
--------V-10D1-------------------------------
INT 10 U VIDEO - HP 100LX/200LX - INTERNAL - ???
AH = D1h
AL = 01h
Return: ???
Note: called by AH=D0h
SeeAlso: AH=D0h,AH=D4h
--------V-10D4-------------------------------
INT 10 U VIDEO - HP 100LX/200LX - INTERNAL - ???
AH = D4h
AL = 29h
Return: ???
Note: called by AH=D0h
SeeAlso: AH=D0h,AH=D1h
--------V-10D5-------------------------------
INT 10 - Netroom SCRNCLK - ???
AH = D5h
???
Return: ???
Program: SCRNCLK is a "cloaked" screen accelerator included with Netroom
--------V-10DFA5-----------------------------
INT 10 U - VIDEO - Compaq ADAPT.COM - GET ??? DATA AREA
AX = DFA5h
Return: AX = BDBFh if supported
ES:DI -> ??? data area
BX = ES
SeeAlso: AX=BFA0h
--------V-10EF-------------------------------
INT 10 - VIDEO - MSHERC.COM - GET VIDEO ADAPTER TYPE AND MODE
AH = EFh
Return: DL = video adapter type
00h original Hercules
01h Hercules Plus (port 03BAh reads x001xxxxx)
02h Hercules InColor (port 03BAh reads x101xxxxx)
FFh not a Hercules-compatible card (port 03BAh bit 7 not pulsing)
DH = memory mode byte
00h "half" mode
01h "full" mode
FFh not a Hercules-compatible card
Program: MSHERC.COM is a support program for the Microsoft Quick languages
which makes their graphics libraries compatible with a Hercules card
by adding video modes 08h and 88h, and supporting text in the new
graphics modes.
Notes: while in mode 08h or 88h, INT 10 supports the Hercules card much like
a CGA.
MSHERC performs an installation check by setting DL=FFh and testing
whether it has been changed on return, which causes it to reinstall
itself when no HGC is present (or HGC emulation has temporarily been
disabled); a better installation check would be to use DX=80FFh and
check whether DX has been changed
reportedly returns DH=00h on some not-entirely-Hercules-compatible
cards
Index: installation check;MSHERC
--------V-10F0-------------------------------
INT 10 - EGA Register Interface Library - READ ONE REGISTER
AH = F0h
BL = register number
BH = 00h
DX = group index (see #0129)
Return: BL = data
Note: the RIL is provided by EGA.SYS, the Microsoft Mouse driver, the OS/2
compatibility box, and others
SeeAlso: AH=F1h,AH=F2h,INT 2F/AX=BC00h

(Table 0129)
Values for group index:
Pointer/data chips
00h CRT Controller (25 reg) 3B4h mono modes, 3D4h color modes
08h Sequencer (5 registers) 3C4h
10h Graphics Controller (9 registers) 3CEh
18h Attribute Controller (20 registers) 3C0h
Single registers
20h Miscellaneous Output register 3C2h
28h Feature Control register (3BAh mono modes, 3DAh color modes)
30h Graphics 1 Position register 3CCh
38h Graphics 2 Position register 3CAh
--------V-10F1-------------------------------
INT 10 - EGA Register Interface Library - WRITE ONE REGISTER
AH = F1h
DX = group index (see #0129)
if single register:
BL = value to write
otherwise
BL = register number
BH = value to write
Return: BL = data
Note: the RIL is provided by EGA.SYS, the Microsoft Mouse driver, the OS/2
compatibility box, and others
SeeAlso: AX=7F05h,AH=F0h,AH=F3h
--------V-10F2-------------------------------
INT 10 - EGA Register Interface Library - READ REGISTER RANGE
AH = F2h
CH = starting register number
CL = number of registers (>1)
DX = group index (00h,08h,10h,18h) (see #0129)
ES:BX -> buffer, CL bytes
Note: the RIL is provided by EGA.SYS, the Microsoft Mouse driver, the OS/2
compatibility box, and others
SeeAlso: AH=F0h,AH=F3h
--------V-10F3-------------------------------
INT 10 - EGA Register Interface Library - WRITE REGISTER RANGE
AH = F3h
CH = starting register
CL = number of registers (>1)
DX = group index (00h,08h,10h,18h) (see #0129)
ES:BX -> buffer, CL bytes
Note: the RIL is provided by EGA.SYS, the Microsoft Mouse driver, the OS/2
compatibility box, and others
SeeAlso: AX=7F05h,AH=F1h,AH=F2h
--------V-10F4-------------------------------
INT 10 - EGA Register Interface Library - READ REGISTER SET
AH = F4h
CX = number of registers to read (>1)
ES:BX -> table of register records (see #0130)
Return: register values in table filled in
Note: the RIL is provided by EGA.SYS, the Microsoft Mouse driver, the OS/2
compatibility box, and others
SeeAlso: AH=F0h,AH=F2h,AH=F5h

Format of EGA RIL entries in table of register records:
Offset Size Description (Table 0130)
00h WORD group index
Pointer/data chips
00h CRTC (3B4h mono modes, 3D4h color modes)
08h Sequencer 3C4h
10h Graphics Controller 3CEh
18h Attribute Controller 3C0h
Single registers
20h Miscellaneous Output register 3C2h
28h Feature Control register (3BAh mono modes, 3DAh color)
30h Graphics 1 Position register 3CCh
38h Graphics 2 Position register 3CAh
02h BYTE register number (0 for single registers)
03h BYTE register value
--------V-10F5-------------------------------
INT 10 - EGA Register Interface Library - WRITE REGISTER SET
AH = F5h
CX = number of registers to write (>1)
ES:BX -> table of records (see #0130)
Note: the RIL is provided by EGA.SYS, the Microsoft Mouse driver, the OS/2
compatibility box, and others
SeeAlso: AX=7F05h,AH=F1h,AH=F3h,AH=F4h
--------V-10F6-------------------------------
INT 10 - EGA Register Interface Library - REVERT TO DEFAULT REGISTERS
AH = F6h
Note: provided by the Microsoft Mouse driver, OS/2 compatibility box, and
others
SeeAlso: AH=F7h
--------V-10F7-------------------------------
INT 10 - EGA Register Interface Library - DEFINE DEFAULT REGISTER TABLE
AH = F7h
DX = port number
Pointer/data chips
00h CRTC (3B4h mono modes, 3D4h color modes)
08h Sequencer 3C4h
10h Graphics Controller 3CEh
18h Attribute Controller 3C0h
Single registers
20h Miscellaneous Output register 3C2h
28h Feature Control register (3BAh mono modes, 3DAh color modes)
30h Graphics 1 Position register 3CCh
38h Graphics 2 Position register 3CAh
ES:BX -> table of one-byte entries, one byte to be written to each
register
Note: the RIL is provided by EGA.SYS, the Microsoft Mouse driver, the OS/2
compatibility box, and others
SeeAlso: AH=F6h
--------V-10FA--BX0000-----------------------
INT 10 - EGA Register Interface Library - INTERROGATE DRIVER
AH = FAh
BX = 0000h
Return: BX = 0000h if RIL driver not present
ES:BX -> EGA Register Interface version number, if present:
byte 0 = major release number
byte 1 = minor release number
Note: the RIL is provided by EGA.SYS, the Microsoft Mouse driver, the OS/2
compatibility box, and others
SeeAlso: AH=F6h,INT 2F/AX=BC00h
--------K-10FA-------------------------------
INT 10 - FASTBUFF.COM - INSTALLATION CHECK
AH = FAh
Return: AX = 00FAh if installed
ES = segment of resident code
Program: FASTBUFF.COM is a keyboard speedup/screen blanking utility by David
Steiner
Index: screen saver;FASTBUFF
--------V-10FE-------------------------------
INT 10 - TopView - GET SHADOW BUFFER
AH = FEh
ES:DI -> assumed video buffer
B800h:0000h color text/CGA graphics, B000h:0000h mono text,
or A000h:0000h EGA/VGA graphics (RSIS environments only)
Return: ES:DI -> actual video buffer for calling process
Desc: Determine the address of the virtual screen to which the program
should write instead of the actual video memory; this permits
programs to be multitasked without interfering with each other's
output, and allows memory managers to move the video memory to
permit larger programs to be loaded.
Notes: if no multitasker or RSIS-compliant environment is installed, ES:DI is
returned unchanged; RSIS is the Relocated Screen Interface
Specification
for display pages other than 0, use AH=05h and AH=0Fh to determine
whether a particular page exists
TopView requires a call to AH=FFh to notify it that the screen has
changed; DESQview will check for changes itself until the first call
to AH=FFh
SeeAlso: AH=05h,AX=5201h,AH=FFh,INT 15/AX=1024h,INT 21/AH=2Bh"DESQview"
SeeAlso: INT 21/AH=ECh"DoubleDOS"
--------V-10FF-------------------------------
INT 10 - TopView - UPDATE SCREEN FROM SHADOW BUFFER
AH = FFh
CX = number of consecutive changed characters
ES:DI -> first changed character in shadow buffer
Notes: avoid CX=0000h
DESQview will discontinue the automatic screen updating initiated by
AH=FEh after this call
not supported (ignored) by DESQview/X 1.0x
SeeAlso: AH=93h,AH=FEh
--------E-10FF-------------------------------
INT 10 - DJ GO32.EXE 80386+ DOS extender - VIDEO EXTENSIONS
AH = FFh
AL = video mode (see #0131)
Program: GO32.EXE is a DOS extender included as part of the 80386 port of the
GNU C/C++ compiler by DJ Delorie and distributed as DJGPP
SeeAlso: AH=00h,INT 21/AH=FFh"GO32"

(Table 0131)
Values for GO32 video mode number:
00h 80x25 text
01h default text
02h CXxDX text
03h biggest text
04h 320x200 graphics
05h default graphics
06h CXxDX graphics
07h biggest non-interlaced graphics
08h biggest graphics
Index: video modes;GO32
--------V-10FF-------------------------------
INT 10 - VIDEO - Oak VGA BIOS v1.02+ - SET EMULATION
AH = FFh
AL = emulation
43h ('C') CGA emulation
45h ('E') EGA emulation
4Dh ('M') Hercules emulation
56h ('V') VGA emulation
ES:DI -> signature string "Calamity"
Return: VGA switched to suggested mode
SeeAlso: AH=00h,AX=007Fh,AX=5F01h
--------R-10FF00-----------------------------
INT 10 - CARBON COPY PLUS v5.0 - CHECK IF CC CONNECTED TO CCHELP
AX = FF00h
Return: BL = state
00h not connected
01h connected
SeeAlso: AX=FF01h,AX=FF02h
--------R-10FF01-----------------------------
INT 10 - CARBON COPY PLUS v5.0 - DISCONNECT AND RESET LINE
AX = FF01h
SeeAlso: AX=FF00h,AX=FF02h
--------R-10FF02-----------------------------
INT 10 - CARBON COPY PLUS v5.0 - GET LAST PHONE NUMBER DIALED
AX = FF02h
Return: ES:DI -> ASCIZ phone number
SeeAlso: AX=FF00h,AX=FF01h
--------C-11---------------------------------
INT 11 - CPU-generated (80486+) - ALIGNMENT CHECK
Desc: automatically generated by the CPU when the AC flag is set, the current
privilege level is 3, and a misaligned memory access (WORD not on an
even address or DWORD not on a multiple of 4) is made
Note: not all V86 monitors allow the AC flag to be set, such as Turbo
Debugger 386
--------B-11---------------------------------
INT 11 - BIOS - GET EQUIPMENT LIST
Return: (E)AX = BIOS equipment list word (see #0132)
Note: since older BIOSes do not know of the existence of EAX, the high word
of EAX should be cleared before this call if any of the high bits
will be tested

Bitfields for BIOS equipment list:
Bit(s) Description (Table 0132)
0 floppy disk(s) installed (see 6-7)
1 80x87 coprocessor installed
3-2 number of 16K banks of RAM on motherboard (PC only)
number of 64K banks of RAM on motherboard (XT only)
2 pointing device installed (PS)
3 unused (PS)
5-4 initial video mode
00 EGA, VGA, or PGA
01 40x25 color
10 80x25 color
11 80x25 monochrome
7-6 number of floppies installed less 1 (if 0 set)
8 DMA support installed (PCjr, Tandy 1400LT)
DMA support *not* installed (Tandy 1000's)
11-9 number of serial ports installed
12 game port installed
13 serial printer attached (PCjr)
internal modem installed (PC/Convertible)
15-14 number of parallel ports installed
---Compaq, Dell, and many other 386/486 machines--
23 page tables set so that Weitek coprocessor addressable in real mode
24 Weitek math coprocessor present
---Compaq Systempro---
25 internal DMA parallel port available
26 IRQ for internal DMA parallel port (if bit 25 set)
0 = IRQ5
1 = IRQ7
28-27 parallel port DMA channel
00 DMA channel 0
01 DMA channel 0 ???
10 reserved
11 DMA channel 3
SeeAlso: INT 12
--------d-11----SI6A6A-----------------------
INT 11 - Columbia Data Products Standard Device Level Protocol (SDLP) 1.6
SI = 6A6Ah
AH = command (see #0133)
AL = SCSI Addressing (see #0134)
Return: CF clear if successful
DI = 6A6Ah if AH=01h on entry (maybe for all functions???)
AH = ??? for command 01h
CF set on error
AL = error code
SeeAlso: INT 21/AX=4402h"ASPI"

(Table 0133)
Values for SDLP command:
00h SDLP initialization
01h SDLP System Identify
02h simple read sectors
03h simple write sectors
04h simple verify sectors/seek to sector
05h get device size/type
06h ready unit
07h format unit
08h diagnostics
09h rewind
0Ah erase
0Bh write filemarks
0Ch space
0Dh prevent/allow media removal
0Eh load/unload media
0Fh reserved - returns good status
10h set block size
11h write setmark
12h set error level
13h get address of Request Sense Buffer
14h get SDLP error via Request Sense
F0h Vendor Unique Function (WD7000-FASST2 only)
FDh reset current SCSI HAC
FEh get/set current SCSI HAC
FFh execute SCSI command

Bitfields for SDLP SCSI addressing:
Bit(s) Description (Table 0134)
7-6 Host Adapter
5-3 SCSI Target ID
2-0 SCSI Target LUN (logical unit number)
--------V-110225BX6900-----------------------
INT 11 - Blank-It Screen Blanker - INSTALLATION CHECK
AX = 0225h
BX = 6900h
Return: BL = 23h
ES:DI -> ASCIZ "BLNKIT"
Program: Blank-It is a resident screen blanker by Rhode Island Soft Systems,
Inc.
SeeAlso: AX=0225h/BX=6902h,AX=0225h/BX=6908h,AX=0225h/BX=6909h,INT 14/AX=AA01h
Index: screen saver;Blank-It
--------V-110225BX6901-----------------------
INT 11 - Blank-It Screen Blanker - SET TIMEOUT FOR SCREEN BLANKING
AX = 0225h
BX = 6901h
CX = timeout in timer ticks (18.2/second) or 0000h to disable timeout
largest value is 59 minutes (FBACh or 64428)
Return: CF clear if successful
DI = 6A6Ah (possibly also 6A6Ah for all following functions)
AH = ???
CF set on error
AL = error code
SeeAlso: AX=0225h/BX=6900h,AX=0225h/BX=6904h
Index: screen saver;Blank-It
--------V-110225BX6902-----------------------
INT 11 - Blank-It Screen Blanker - ENABLE THE SOFTWARE
AX = 0225h
BX = 6902h
Return: CF clear if successful
CF set on error
AL = error code
SeeAlso: AX=0225h/BX=6900h,AX=0225h/BX=6903h
Index: screen saver;Blank-It
--------V-110225BX6903-----------------------
INT 11 - Blank-It Screen Blanker - DISABLE THE SOFTWARE
AX = 0225h
BX = 6903h
Return: CF clear if successful
CF set on error
AL = error code
SeeAlso: AX=0225h/BX=6900h,AX=0225h/BX=6902h
Index: screen saver;Blank-It
--------V-110225BX6904-----------------------
INT 11 - Blank-It Screen Blanker - GET BLANKING TIMEOUT
AX = 0225h
BX = 6904h
Return: CF clear if successful
BX = timeout (see BX=6901h)
CF set on error
AL = error code
SeeAlso: AX=0225h/BX=6900h,AX=0225h/BX=6901h
Index: screen saver;Blank-It
--------V-110225BX6905-----------------------
INT 11 - Blank-It Screen Blanker - ENABLE WINDOWS COMPATIBILITY MODE
AX = 0225h
BX = 6905h
Return: CF clear if successful
CF set on error
AL = error code
SeeAlso: AX=0225h/BX=6900h,AX=0225h/BX=6906h
Index: screen saver;Blank-It
--------V-110225BX6906-----------------------
INT 11 - Blank-It Screen Blanker - DISABLE WINDOWS COMPATIBILITY MODE
AX = 0225h
BX = 6906h
Return: CF clear if successful
CF set on error
AL = error code
Program: Blank-It is a resident screen blanker by Rhode Island Soft Systems,
Inc.
SeeAlso: AX=0225h/BX=6900h,AX=0225h/BX=6905h
Index: screen saver;Blank-It
--------V-110225BX6907-----------------------
INT 11 - Blank-It Screen Blanker - UNBLANK THE SCREEN
AX = 0225h
BX = 6907h
Return: CF clear if successful
CF set on error
AL = error code
SeeAlso: AX=0225h/BX=6900h,AX=0225h/BX=6908h
Index: screen saver;Blank-It
--------V-110225BX6908-----------------------
INT 11 - Blank-It Screen Blanker - BLANK THE SCREEN
AX = 0225h
BX = 6908h
Return: CF clear if successful
CF set on error
AL = error code
SeeAlso: AX=0225h/BX=6900h,AX=0225h/BX=6907h
Index: screen saver;Blank-It
--------V-110225BX6909-----------------------
INT 11 - Blank-It Screen Blanker - SET HOTKEY FOR MANUAL BLANKING
AX = 0225h
BX = 6909h
CL = key scan code (see #0135)
Return: CF clear if successful
CF set on error
AL = error code
Program: Blank-It is a resident screen blanker by Rhode Island Soft Systems,
Inc.
SeeAlso: AX=0225h/BX=6900h
Index: screen saver;Blank-It|hotkeys;Blank-It

(Table 0135)
Values for Blank-It hotkey scan code:
00h No hot key
1Dh Left CTRL
2Ah Left Shift
36h Right Shift
57h F11
58h F12
--------G-1105D7-----------------------------
INT 11 CU - Borland C++ IDE - INSTALLED CALLOUT
AX = 05D7h
BX = product ID (0088h)
Note: called by the BC++ IDE when an application calls
INT 12/AX=05D7h/BX=05D7h
SeeAlso: INT 12/AX=05D7h/BX=05D7h
Index: installation check;Borland C++ IDE
--------F-1177-------------------------------
INT 11 - RainbowFAX v1.3 - SFENGINE API - OPERATIONAL CONTROL
AH = 77h
AL = subfunction
01h request SFENGINE start
Return: AX = 0001h
02h check if SFENGINE started
Return: AX = 0000h or 0001h
03h request SFENGINE stop
Return: AX = 0001h
04h check if SFENGINE stopped
Return: AX = 0000h or 0001h
05h installation check
Return: AX = 0001h
06h uninstall???
BX:DX -> return address for successful uninstall???
Return: (at caller's address)
AX = 0000h
else
Return: AX = FFFFh
Return: ES:DX -> ASCIZ signature string "SFAX ENGINE V1.0"
followed by internal data area???
SeeAlso: AH=78h,AH=79h,AH=7Ah,AH=7Ch
Index: installation check;RainbowFAX|installation check;SFENGINE
Index: uninstall;RainbowFAX|uninstall;SFENGINE
--------F-1178-------------------------------
INT 11 - RainbowFAX v1.3 - SFENGINE API - ???
AH = 78h
AL = subfunction
7801h set ???
BX = new state for ???
0000h ???
else ???
Return: AX = 0001h
7802h set ???
BX = ???
CX = ???
Return: AX = 0001h
7803h set ???
BX = new state for ???
0000h ???
else ???
Return: AX = 0001h
78XXh invalid subfunction
Return: AX = FFFFh
SeeAlso: AH=77h,AH=79h,AH=7Ah,AH=7Ch
--------F-1179-------------------------------
INT 11 - RainbowFAX v1.3 - SFENGINE API - ???
AH = 79h
AL = subfunction
01h set ??? flag
Return: AX = previous state (0000h already set, 0001h clear)
02h clear ??? flag (see subfunc 01h)
Return: AX = 0001h
03h set ??? flag (different from subfn 02h or 04h)
Return: AX = 0001h
04h clear ??? flag (different from subfn 02h or 03h)
Return: AX = 0001h
else
Return: AX = FFFFh
SeeAlso: AH=77h,AH=78h,AH=7Ah,AH=7Ch
--------F-117A-------------------------------
INT 11 - RainbowFAX v1.3 - SFENGINE API - ???
AH = 7Ah
AL = subfunction
01h set ??? flag
Return: AX = previous state (0000h already set, 0001h clear)
02h clear ??? flag
Return: AX = 0001h
03h set ??? flag (different from subfn 02h)
Return: AX = 0001h
else
Return: AX = FFFFh
SeeAlso: AH=77h,AH=78h,AH=79h,AH=7Ch
--------F-117C-------------------------------
INT 11 - RainbowFAX v1.3 - SFENGINE API - ???
AH = 7Ch
AL = subfunction
01h set ??? flag (see also subfn 02h)
Return: AX = 0001h
02h clear ??? flag (see also subfn 01h)
Return: AX = 0001h
else
Return: AX = FFFFh
SeeAlso: AH=77h,AH=78h,AH=79h,AH=7Ah
--------S-11BC--DX1954-----------------------
INT 11 - BNU FOSSIL - INSTALLATION CHECK
AH = BCh
DX = 1954h
Return: AX = 1954h
ES:DX -> entry point of driver (instead of INT 14)
SeeAlso: INT 14/AH=04h"FOSSIL"
--------d-11FF--SI6A6A-----------------------
INT 11 - WD7000 SDLP interface - EXECUTE GENERIC SCSI COMMAND
AH = FFh
SI = 6A6Ah
AL = SCSI Addressing (see #0136)
CX = bytes of data to be transmitted (max FFF0h)
DH = 00h
DL = length of SCSI Command Descriptor Block
DS:DI -> SCSI Command Descriptor Block
ES:BX -> data buffer
Return: CF set on error
AL = error code
CF clear if successful
Note: because of busmaster operations with WD7000FASST avoid accessing
video memory directly; check 386 memory manager for VDS support.
The WD7000XTAT works with programmed IO and does not have this
limitation.
SeeAlso: INT 21/AX=4402h"ASPI",INT 2F/AX=7F01h

Bitfields for SDLP SCSI addressing:
Bit(s) Description (Table 0136)
2-0 SCSI Target LUN (logical unit number)
5-3 SCSI Target ID
7 write flag, set for write operations, clear otherwise
--------T-11FFFECXFFFE-----------------------
INT 11 - BACK&FORTH (before v1.62) API
AX = FFFEh
CX = FFFEh
BX = function
00h installation check
Return: AX = installation state
0001h BNFHIGH and BNFLOW both loaded
0003h only BNFHIGH loaded
else neither loaded
01h ???
Return: DX:AX -> ???
02h ???
03h ???
04h ???
05h ??? switches current PSP segment and stack if BNFLOW has not
yet announced itself installed
06h ???
Return: AX = ???
SeeAlso: INT 12/AX=FFFEh
Index: installation check;BACK&FORTH
--------B-12---------------------------------
INT 12 - BIOS - GET MEMORY SIZE
Return: AX = kilobytes of contiguous memory starting at absolute address 00000h
Note: this call returns the contents of the word at 0040h:0013h; in PC and
XT, this value is set from the switches on the motherboard
SeeAlso: INT 11,INT 2F/AX=4A06h
--------K-12----CX1806-----------------------
INT 12 - KEYBUI v2.0+ - INSTALLATION CHECK
CX = 1806h
Return: AX = kilobytes of contiguous memory starting at absolute address 00000h
CX = 1960h if installed
Program: KEYBUI is a resident keyboard driver by Johan Zwiekhorst which allows
accented characters and box drawing on standard QWERTY keyboards; it
also provides break-to-DOS and screen blanking capabilities
SeeAlso: INT 14/AX=AA01h
Index: screen saver;KEYBUI
--------d-12----CX1807-----------------------
INT 12 - PARKER v2.0+ - INSTALLATION CHECK
CX = 1807h
Return: AX = kilobytes of contiguous memory starting at absolute address 00000h
CX = 1961h if installed
Program: PARKER is an optionally-resident hard disk parking program by Johan
Zwiekhorst
--------G-1205D7BX05D7-----------------------
INT 12 U - Borland C++ IDE - INSTALLATION CHECK
AX = 05D7h (1495d)
BX = 05D7h
Note: the BC++ IDE will call INT 11/AX=05D7h/BX=0088h if it is loaded
SeeAlso: INT 11/AX=05D7h/BX=0088h
--------v-124350BX4920-----------------------
INT 12 C - CPI-standard virus - "FRIEND" CHECK
AX = 4350h
BX = 4920h
CX = AB46h
DX = 554Eh
Return: if friendly (not to be infected)
CX:DX -> ASCIZ identity code (changes yearly)
SeeAlso: AX=EC00h"VIRUS",INT 13/AX=5001h,INT 21/AX=0B56h
--------T-12FFFECXFFFE-----------------------
INT 12 - Back&Forth v1.62+ - API
AX = FFFEh
CX = FFFEh
BX = function
00h installation check
Return: AX = 0001h installed
else not loaded
01h (reserved)
02h build program ID list (shareware Back&Forth)
ES:DI -> buffer of at least 100 bytes, to be filled with words
Return: AX = number of programs defined
ES:DI buffer filled with AX words
02h get memory statistics (Back&Forth Professional)
Return: AX = available swap memory, KBytes
BX = maximum task size, KBytes
DX = fixed overhead per task, excluding video/macro
storage
03h switch to specified task (task need not be open yet)
DX = two-letter program ID
Return: AX = status
0000h if task undefined
0001h task switch will occur when safe
04h (reserved)
05h (reserved)
06h get version (documented only for Back&Forth Professional)
Return: AX = version * 100 (v1.71 = 00ABh)
07h spawn program (Back&Forth Professional only???)
ES:DI -> BF_SPAWN record (see #0138)
Return: AX = status
0000h if no task handles free
0001h spawn will occur when safe
08h get open tasks (documented only for Back&Forth Professional)
ES:DI -> task info buffer (see #0137,#0139)
Return: AX = number of open tasks (max 20)
Note: the supplied buffer must be large enough to hold 21
task entries
09h (reserved)
---Back&Forth Professional---
0Ah get active clipboard filename
Return: DX:AX -> ASCIZ clipboard filename
0Bh get active task number
AX = active task number (00h-13h)
BX = number of tasks allocated
DX = maximum number of tasks
0Ch (reserved)
0Dh (reserved)
0Eh (reserved)
0Fh stuff string into keyboard buffer
ES:DI -> ASCIZ string to be stuffed
Return: nothing
10h check if in graphics mode
Return: AX = state
0000h color text mode
0004h mono text mode
FFFFh graphics mode
11h get Back&Forth Professional user number
Return: AX = user number (0000h-00FFh)
12h switch task by task number
DX = task number
Return: AX = status
0000h attempted to switch to active task
0001h task switch will occur when safe
FFFFh invalid task number
13h delete (kill) task
DX = task number
Return: AX = status
0000h attempted to delete the active task
0001h successfully deleted
FFFFh invalid task number
Note: the active task number will change if the deleted task
was lower in the task list than the active task
14h get next available task handle
Return: AX = next available task handle
FFFFh if task table is full
Program: Back & Forth is a task switcher by Progressive Solutions, Inc.
SeeAlso: INT 11/AX=FFFEh
Index: installation check;BACK&FORTH

Format of Back&Forth task info buffer:
Offset Size Description (Table 0137)
00h 21 BYTEs ASCIZ task name
15h BYTE hotkey shift state (as for INT 16/AH=02h)
16h WORD hotkey scan code
18h WORD program ID
Index: hotkeys;Back&Forth
SeeAlso: #0138,#0139

Format of Back&Forth Professional BF_SPAWN record:
Offset Size Description (Table 0138)
00h 21 BYTEs task description
15h BYTE flag: disable hotkeys
16h WORD environment size in bytes
18h BYTE hotkey shift flags
19h WORD hotkey scancode
1Bh WORD maximum number of EMS pages
1Dh WORD required memory in KBytes
1Fh 3 BYTEs DESQview-style two-letter program ID
22h 13 BYTEs base name of program to be run (no path or extension)
2Fh 66 BYTEs directory from which to start program
71h 66 BYTEs initial current directory for program
SeeAlso: #0137,#0139

Format of Back&Forth Professional BF_TASK record:
Offset Size Description (Table 0139)
00h DWORD Unix-style task start time (seconds since 1/1/1970)
04h 21 BYTEs task description
19h DWORD elapsed time in task (seconds)
1Dh WORD task ID
1Fh BYTE task hotkey keyboard flags
20h WORD task hotkey scan code
22h DWORD time task was suspended/exited
26h WORD task handle
SeeAlso: #0137,#0138
--------B-1300-------------------------------
INT 13 - DISK - RESET DISK SYSTEM
AH = 00h
DL = drive (if bit 7 is set both hard disks and floppy disks reset)
Return: AH = status (see #0140)
CF clear if successful (returned AH=00h)
CF set on error
Note: forces controller to recalibrate drive heads (seek to track 0)
for PS/2 35SX, 35LS, 40SX and L40SX, as well as many other systems,
both the master drive and the slave drive respond to the Reset
function that is issued to either drive
SeeAlso: AH=0Dh,AH=11h,INT 21/AH=0Dh,INT 4D/AH=00h"TI Professional"
--------B-1301-------------------------------
INT 13 - DISK - GET STATUS OF LAST OPERATION
AH = 01h
DL = drive (bit 7 set for hard disk)
Return: CF clear if successful (returned status 00h)
CF set on error
AH = status of previous operation (see #0140)
Note: some BIOSes return the status in AL; the PS/2 Model 30/286 returns the
status in both AH and AL
SeeAlso: AH=00h,INT 4D/AH=01h,MEM 0040h:0074h

(Table 0140)
Values for disk operation status:
00h successful completion
01h invalid function in AH or invalid parameter
02h address mark not found
03h disk write-protected
04h sector not found/read error
05h reset failed (hard disk)
05h data did not verify correctly (TI Professional PC)
06h disk changed (floppy)
07h drive parameter activity failed (hard disk)
08h DMA overrun
09h data boundary error (attempted DMA across 64K boundary or >80h sectors)
0Ah bad sector detected (hard disk)
0Bh bad track detected (hard disk)
0Ch unsupported track or invalid media
0Dh invalid number of sectors on format (PS/2 hard disk)
0Eh control data address mark detected (hard disk)
0Fh DMA arbitration level out of range (hard disk)
10h uncorrectable CRC or ECC error on read
11h data ECC corrected (hard disk)
20h controller failure
31h no media in drive (IBM/MS INT 13 extensions)
32h incorrect drive type stored in CMOS (Compaq)
40h seek failed
80h timeout (not ready)
AAh drive not ready (hard disk)
B0h volume not locked in drive (INT 13 extensions)
B1h volume locked in drive (INT 13 extensions)
B2h volume not removable (INT 13 extensions)
B3h volume in use (INT 13 extensions)
B4h lock count exceeded (INT 13 extensions)
B5h valid eject request failed (INT 13 extensions)
BBh undefined error (hard disk)
CCh write fault (hard disk)
E0h status register error (hard disk)
FFh sense operation failed (hard disk)
--------B-1302-------------------------------
INT 13 - DISK - READ SECTOR(S) INTO MEMORY
AH = 02h
AL = number of sectors to read (must be nonzero)
CH = low eight bits of cylinder number
CL = sector number 1-63 (bits 0-5)
high two bits of cylinder (bits 6-7, hard disk only)
DH = head number
DL = drive number (bit 7 set for hard disk)
ES:BX -> data buffer
Return: CF set on error
if AH = 11h (corrected ECC error), AL = burst length
CF clear if successful
AH = status (see #0140)
AL = number of sectors transferred
Notes: errors on a floppy may be due to the motor failing to spin up quickly
enough; the read should be retried at least three times, resetting
the disk with AH=00h between attempts
most BIOSes support "multitrack" reads, where the value in AL
exceeds the number of sectors remaining on the track, in which
case any additional sectors are read beginning at sector 1 on
the following head in the same cylinder; the CONFIG.SYS command
MULTITRACK can be used to force DOS to split disk accesses which
would wrap across a track boundary into two separate calls
the IBM AT BIOS and many other BIOSes use only the low four bits of
DH (head number) since the WD-1003 controller which is the standard
AT controller (and the controller that IDE emulates) only supports
16 heads
AWARD AT BIOS and AMI 386sx BIOS have been extended to handle more
than 1024 cylinders by placing bits 10 and 11 of the cylinder number
into bits 6 and 7 of DH
SeeAlso: AH=03h,AH=0Ah,AH=06h"V10DISK.SYS",AH=21h"PS/1",INT 4D/AH=02h
--------B-1303-------------------------------
INT 13 - DISK - WRITE DISK SECTOR(S)
AH = 03h
AL = number of sectors to write (must be nonzero)
CH = low eight bits of cylinder number
CL = sector number 1-63 (bits 0-5)
high two bits of cylinder (bits 6-7, hard disk only)
DH = head number
DL = drive number (bit 7 set for hard disk)
ES:BX -> data buffer
Return: CF set on error
CF clear if successful
AH = status (see #0140)
AL = number of sectors transferred
Notes: errors on a floppy may be due to the motor failing to spin up quickly
enough; the write should be retried at least three times, resetting
the disk with AH=00h between attempts
most BIOSes support "multitrack" writes, where the value in AL
exceeds the number of sectors remaining on the track, in which
case any additional sectors are written beginning at sector 1 on
the following head in the same cylinder; the CONFIG.SYS command
MULTITRACK can be used to force DOS to split disk accesses which
would wrap across a track boundary into two separate calls
the IBM AT BIOS and many other BIOSes use only the low four bits of
DH (head number) since the WD-1003 controller which is the standard
AT controller (and the controller that IDE emulates) only supports
16 heads
AWARD AT BIOS and AMI 386sx BIOS have been extended to handle more
than 1024 cylinders by placing bits 10 and 11 of the cylinder number
into bits 6 and 7 of DH
SeeAlso: AH=02h,AH=0Bh,AH=07h"V10DISK.SYS",AH=22h"PS/1",INT 4D/AH=03h
--------B-1304-------------------------------
INT 13 - DISK - VERIFY DISK SECTOR(S)
AH = 04h
AL = number of sectors to verify (must be nonzero)
CH = low eight bits of cylinder number
CL = sector number 1-63 (bits 0-5)
high two bits of cylinder (bits 6-7, hard disk only)
DH = head number
DL = drive number (bit 7 set for hard disk)
ES:BX -> data buffer (PC,XT,AT with BIOS prior to 11/15/85)
Return: CF set on error
CF clear if successful
AH = status (see #0140)
AL = number of sectors verified
Notes: errors on a floppy may be due to the motor failing to spin up quickly
enough; the write should be retried at least three times, resetting
the disk with AH=00h between attempts
this function does not compare the disk with memory, it merely
checks whether the sector's stored CRC matches the data's actual CRC
the IBM AT BIOS and many other BIOSes use only the low four bits of
DH (head number) since the WD-1003 controller which is the standard
AT controller (and the controller that IDE emulates) only supports
16 heads
AWARD AT BIOS and AMI 386sx BIOS have been extended to handle more
than 1024 cylinders by placing bits 10 and 11 of the cylinder number
into bits 6 and 7 of DH
SeeAlso: AH=02h,INT 4D/AH=04h,INT 4D/AH=06h
--------B-1305-------------------------------
INT 13 - FLOPPY - FORMAT TRACK
AH = 05h
AL = number of sectors to format
CH = track number
DH = head number
DL = drive number
ES:BX -> address field buffer (see #0141)
Return: CF set on error
CF clear if successful
AH = status (see #0140)
Notes: on AT or higher, call AH=17h first
the number of sectors per track is read from the diskette parameter
table pointed at by INT 1E
SeeAlso: AH=05h"FIXED",AH=17h,AH=18h,INT 1E

Format of floppy format address field buffer entry (one per sector in track):
Offset Size Description (Table 0141)
00h BYTE track number
01h BYTE head number (0-based)
02h BYTE sector number
03h BYTE sector size (00h=128 bytes, 01h=256 bytes, 02h=512, 03h=1024)
--------B-1305-------------------------------
INT 13 - FIXED DISK - FORMAT TRACK
AH = 05h
AL = interleave value (XT-type controllers only)
ES:BX -> 512-byte format buffer
the first 2*(sectors/track) bytes contain F,N for each sector
F = sector type
00h for good sector
20h to unassign from alternate location
40h to assign to alternate location
80h for bad sector
N = sector number
CH = cylinder number (bits 8,9 in high bits of CL)
CL = high bits of cylinder number (bits 7,6)
DH = head
DL = drive
Return: CF set on error
CF clear if successful
AH = status code (see #0140)
Notes: AWARD AT BIOS and AMI 386sx BIOS have been extended to handle more
than 1024 cylinders by placing bits 10 and 11 of the cylinder number
into bits 6 and 7 of DH
for XT-type controllers on an AT or higher, AH=0Fh should be called
first
the IBM AT BIOS and many other BIOSes use only the low four bits of
DH (head number) since the WD-1003 controller which is the standard
AT controller (and the controller that IDE emulates) only supports
16 heads
not all controller support sector types 20h and 40h
SeeAlso: AH=05h"FLOPPY",AH=06h"FIXED",AH=07h"FIXED",AH=0Fh,AH=18h,AH=1Ah
--------d-1305-------------------------------
INT 13 - Future Domain SCSI BIOS - SEND SCSI MODE SELECT COMMAND
AH = 05h
DL = hard drive ID
ES:BX -> mode select data (see #0142)
Return: CF set on error
CF clear if successful
AH = status code (see #0140)
Notes: this function can be called before AH=07h"SCSI" or AH=06h"SCSI" to
format a SCSI disk with the desired parameters
the mode select data below is from the SCSI-1 specification
the TMC-950 does not support any Future Domain BIOS calls; instead,
it provides a full CAM implementation (see INT 4F/AX=8100h)
SeeAlso: AH=06h"SCSI",AH=07h"SCSI",INT 4F/AX=8100h

Format of Future Domain SCSI mode select data:
Offset Size Description (Table 0142)
00h BYTE number of bytes of remaining data (12 + vendor unique length)
01h BYTE reserved (0)
02h BYTE medium type (0 for hard disk)
03h BYTE reserved (0)
04h BYTE block descriptor length (8)
05h BYTE density code (0 for hard disk)
06h 3 BYTEs (big-endian) number of blocks (000000h for entire disk)
09h BYTE reserved (0)
0Ah 3 BYTEs (big-endian) block length (512 standard, or 256)
0Dh ??? vendor-specific parameter bytes (optional)
--------B-13057FSI324D-----------------------
INT 13 - 2M - FORMAT TRACK
AX = 057Fh
SI = 324Dh ("2M")
CH = track number
DH = head number
DL = drive number
ES:BX -> boot sector of future 2M diskette
Return: CF set on error
CF clear if successful
AH = status (see #0140)
Program: 2M is a TSR developed by Ciriaco Garcia de Celis to support
non standard diskettes with 820-902/1476-1558K (5.25 DD/HD)
and 984-1066/1804-1886K/3608-3772K (3.5 DD/HD/ED)
Notes: it is not necessary to call AH=17h/AH=18h first (will be ignored)
the diskette format must always begin on cylinder 0 head 0
the boot sector can be obtained from an already-formatted 2M diskette
(by calling AH=02h with head number 00h in 2M v1.x and with head
number 80h for 2M v2+)
the installation check for 2M must search for a "CiriSOFT:2M:1.3" or
"CiriSOFT:2MX:3.0" or similar (recomended ":2M:", ":2MX:", or ":2MB:"
substrings) in CiriSOFT TSR interface
since 2M v2.0, the BOOT sector is emulated using the first physical
sector of FAT2; the second-sixth physical sectors of FAT2 in HD or ED
diskettes store the SuperBOOT code. To skip the FAT2 emulation (using
FAT1) of 2M, in order to read the SuperBOOT code, head number must be
80h-81h instead 0-1 (bit 7 active) in standard read/write functions.
This lets diskcopy programs format 2M target diskettes copying
SuperBOOT code. If the target diskette is already 2MF formatted
(containing boot code) this trick it is not necessary.
when using STV technology (offset 65 of boot sector equal to 1) it is
necessary to write the full track before formatting (except track 0
side 0) to complete the format and skip future CRC errors on read; in
track 0 side 1 the head used must be 81h instead 1. Diskcopy programs
may do a format-write-verify sequential phases to improve performance
SeeAlso: AH=05h"FLOPPY",INT 2F"CiriSOFT TSR interface"
--------B-1306-------------------------------
INT 13 - FIXED DISK - FORMAT TRACK AND SET BAD SECTOR FLAGS (XT,PORT)
AH = 06h
AL = interleave value
CH = cylinder number (bits 8,9 in high bits of CL)
CL = sector number
DH = head
DL = drive
Return: AH = status code (see #0140)
Note: AWARD AT BIOS and AMI 386sx BIOS have been extended to handle more
than 1024 cylinders by placing bits 10 and 11 of the cylinder number
into bits 6 and 7 of DH
SeeAlso: AH=05h"FIXED",AH=07h"FIXED"
--------d-1306-------------------------------
INT 13 - Future Domain SCSI BIOS - FORMAT DRIVE WITH BAD SECTOR MAPPING
AH = 06h
AL = interleave
(0 = default, 1 = consecutive sectors, 2 - 255 = vendor unique)
DL = hard drive ID
DH = defect list info (see #0143)
ES:BX -> defect table A, B or C (see #0144,#0145,#0146)
Return: CF set on error
CF clear if successful
AH = status code (see #0140)
Notes: block addresses must be in ascending order (for table B, cylinder is
most significant, byte from index least significant; for table C,
cylinder is most significant, sector number least significant)
table B defect bytes from index of FFFFFFFFh indicates that the entire
track shall be reassigned
table C defect sector number of FFFFFFFFh indicates that the entire
track shall be reassigned
the TMC-950 does not support any Future Domain BIOS calls; instead,
it provides a full CAM implementation (see INT 4F/AX=8100h)
SeeAlso: AH=05h"SCSI",AH=06h"FIXED",AH=07h"SCSI"

Bitfields for Future Domain SCSI defect list info:
Bit(s) Description (Table 0143)
7-5 drive LUN
4 defect list is available
3 defect list is complete (erase drive's defect list)
2-0 defect table format
(000=use defect table A, 100=use defect table B,
101=use defect table C)

Format of Future Domain SCSI defect table A:
Offset Size Description (Table 0144)
00h WORD number of bytes remaining in table
02h BYTE reserved (0)
03h BYTE reserved (0)
04h WORD (big-endian) defect list length (4*number of defects)
06h 4 DWORDs (big-endian) defect block addresses

Format of Future Domain SCSI defect table B:
Offset Size Description (Table 0145)
00h WORD number of bytes remaining in table
02h BYTE reserved (0)
03h BYTE reserved (0)
04h WORD (big-endian) defect list length (8*number of defects)
06h 8N BYTEs defect list [array] (see #0147)

Format of Future Domain SCSI defect table C:
Offset Size Description (Table 0146)
00h WORD number of bytes remaining in table
02h BYTE reserved (0)
03h BYTE reserved (0)
04h WORD (big-endian) defect list length (8*number of defects)
06h 8N BYTEs defect list [array] (see #0147)

Format of Future Domain SCSI defect list entry:
Offset Size Description (Table 0147)
00h 3 BYTEs (big-endian) cylinder number of defect
03h BYTE head number of defect
04h DWORD (big-endian) defect bytes from index
--------d-1306-------------------------------
INT 13 - Adaptec AHA-154xA/Bustek BT-542 BIOS - IDENTIFY SCSI DEVICES
AH = 06h
Return: AH = status code (see #0140)
CF clear if successful
AL = first drive supported
(80h nonconcurrent operation, 81h concurrent operation)
CF set on error
Desc: determine the number of the first supported SCSI drive
Note: the return value is 80h when two SCSI drives are supported, 81h if
only one SCSI drive is installed
SeeAlso: AH=08h
--------d-1306-------------------------------
INT 13 - V10DISK.SYS - READ DELETED SECTORS
AH = 06h
AL = number of sectors
CH = cylinder number (bits 8,9 in high bits of CL)
CL = sector number
DH = head
DL = drive
ES:BX -> buffer
Return: AH = status code (see #0140)
Program: V10DISK.SYS is a driver for the Flagstaff Engineering 8" floppies
SeeAlso: AH=02h,AH=07h"V10DISK.SYS"
--------B-1307-------------------------------
INT 13 - FIXED DISK - FORMAT DRIVE STARTING AT GIVEN TRACK (XT,PORT)
AH = 07h
AL = interleave value (XT only)
ES:BX = 512-byte format buffer (see AH=05h)
CH = cylinder number (bits 8,9 in high bits of CL)
CL = sector number
DH = head
DL = drive
Return: AH = status code (see #0140)
Note: AWARD AT BIOS and AMI 386sx BIOS have been extended to handle more
than 1024 cylinders by placing bits 10 and 11 of the cylinder number
into bits 6 and 7 of DH
SeeAlso: AH=05h"FIXED",AH=06h"FIXED",AH=1Ah
--------d-1307-------------------------------
INT 13 - Future Domain SCSI BIOS - FORMAT DRIVE
AH = 07h
AL = interleave (0 = default, 1 = consecutive sectors,
2 - 255 = vendor unique)
DL = hard drive ID
Return: CF set on error
CF clear if successful
AH = status code (see #0140)
SeeAlso: AH=05h"SCSI",AH=06h"SCSI",AH=07h"FIXED"
--------d-1307-------------------------------
INT 13 - V10DISK.SYS - WRITE DELETED SECTORS
AH = 07h
AL = number of sectors
CH = cylinder number (bits 8,9 in high bits of CL)
CL = sector number
DH = head
DL = drive
ES:BX -> buffer
Return: AH = status code (see #0140)
Program: V10DISK.SYS is a driver for the Flagstaff Engineering 8" floppies
SeeAlso: AH=03h,AH=06h"V10DISK.SYS"
--------B-1308-------------------------------
INT 13 - DISK - GET DRIVE PARAMETERS (PC,XT286,CONV,PS,ESDI,SCSI)
AH = 08h
DL = drive (bit 7 set for hard disk)
Return: CF set on error
AH = status (07h) (see #0140)
CF clear if successful
AH = 00h
BL = drive type (AT/PS2 floppies only) (see #0148)
CH = low eight bits of maximum cylinder number
CL = maximum sector number (bits 5-0)
high two bits of maximum cylinder number (bits 7-6)
DH = maximum head number
DL = number of drives
ES:DI -> drive parameter table (floppies only)
Notes: may return successful even though specified drive is greater than the
number of attached drives of that type (floppy/hard); check DL to
ensure validity
for systems predating the IBM AT, this call is only valid for hard
disks, as it is implemented by the hard disk BIOS rather than the
ROM BIOS
Toshiba laptops with HardRAM return DL=02h when called with DL=80h,
but fail on DL=81h. The BIOS data at 40h:75h correctly reports 01h.
may indicate only two drives present even if more are attached; to
ensure a correct count, one can use AH=15h to scan through possible
drives
for BIOSes which reserve the last cylinder for testing purposes, the
cylinder count is automatically decremented
SeeAlso: AH=06h"Adaptec",AH=13h"SyQuest",AH=48h,AH=15h,INT 1E,INT 41

(Table 0148)
Values for diskette drive type:
01h 360K
02h 1.2M
03h 720K
04h 1.44M
05h ??? (reportedly an obscure drive type shipped on some IBM machines)
2.88M on some machines (at least AMI 486 BIOS)
06h 2.88M
--------d-1308-------------------------------
INT 13 - V10DISK.SYS - SET FORMAT
AH = 08h
AL = number of sectors
CH = cylinder number (bits 8,9 in high bits of CL)
CL = sector number
DH = head
DL = drive
Return: AH = status code (see #0140)
Program: V10DISK.SYS is a driver for the Flagstaff Engineering 8" floppies
Note: details not available
SeeAlso: AH=03h,AH=06h"V10DISK.SYS"
--------y-130800DLF0-------------------------
INT 13 - SecureDrive - INSTALLATION CHECK
AX = 08000h
DL = F0h
Return: AX = EDCBh for version 1.0-1.2
AX = EDCCh for version 1.3
CX = code segment
DX = data address within code segment
Program: SecureDrive by Mike Ingle allows you to create
an encrypted partition on your harddisk.
--------B-1309-------------------------------
INT 13 - HARD DISK - INITIALIZE CONTROLLER WITH DRIVE PARAMETERS (AT,PS)
AH = 09h
DL = drive (80h for first, 81h for second)
Return: CF clear if successful
CF set on error
AH = status (see #0140)
Notes: on the PC and XT, this function uses the parameter table pointed at by
INT 41
on the AT and later, this function uses the parameter table pointed at
by INT 41 if DL=80h, and the parameter table pointed at by INT 46 if
DL=81h
SeeAlso: INT 41,INT 46
--------B-130A-------------------------------
INT 13 - HARD DISK - READ LONG SECTOR(S) (AT and later)
AH = 0Ah
AL = number of sectors
CH = low eight bits of cylinder number
CL = sector number (bits 5-0)
high two bits of cylinder number (bits 7-6)
DH = head number
DL = drive number (80h = first, 81h = second)
ES:BX -> data buffer
Return: CF clear if successful
CF set on error
AH = status (see #0140)
AL = number of sectors transferred
Notes: this function reads in four to seven bytes of error-correcting code
along with each sector's worth of information
data errors are not automatically corrected, and the read is aborted
after the first sector with an ECC error
used for diagnostics only on PS/2 systems
SeeAlso: AH=02h,AH=0Bh
--------B-130B-------------------------------
INT 13 - HARD DISK - WRITE LONG SECTOR(S) (AT and later)
AH = 0Bh
AL = number of sectors
CH = low eight bits of cylinder number
CL = sector number (bits 5-0)
high two bits of cylinder number (bits 7-6)
DH = head number
DL = drive number (80h = first, 81h = second)
ES:BX -> data buffer
Return: CF clear if successful
CF set on error
AH = status (see #0140)
AL = number of sectors transferred
Notes: each sector's worth of data must be followed by four to seven bytes of
error-correction information
used for diagnostics only on PS/2 systems
SeeAlso: AH=03h,AH=0Ah
--------B-130C-------------------------------
INT 13 - HARD DISK - SEEK TO CYLINDER
AH = 0Ch
CH = low eight bits of cylinder number
CL = sector number (bits 5-0)
high two bits of cylinder number (bits 7-6)
DH = head number
DL = drive number (80h = first, 81h = second hard disk)
Return: CF set on error
CF clear if successful
AH = status (see #0140)
SeeAlso: AH=00h,AH=02h,AH=0Ah,AH=47h
--------d-130D-------------------------------
INT 13 - HARD DISK - RESET HARD DISKS
AH = 0Dh
DL = drive number (80h = first, 81h = second hard disk)
Return: CF set on error
CF clear if successful
AH = status (see #0140)
Notes: reinitializes the hard disk controller, resets the specified drive's
parameters, and recalibrates the drive's heads (seek to track 0)
for PS/2 35SX, 35LS, 40SX and L40SX, as well as many other systems,
both the master drive and the slave drive respond to the Reset
function that is issued to either drive
not for PS/2 ESDI drives
SeeAlso: AH=00h,INT 21/AH=0Dh
--------B-130E-------------------------------
INT 13 - HARD DISK - READ SECTOR BUFFER (XT only)
AH = 0Eh
DL = drive number (80h = first, 81h = second hard disk)
ES:BX -> buffer
Return: CF set on error
CF clear if successful
AH = status code (see #0140)
Notes: transfers controller's sector buffer. No data is read from the drive
used for diagnostics only on PS/2 systems
SeeAlso: AH=0Ah
--------B-130F-------------------------------
INT 13 - HARD DISK - WRITE SECTOR BUFFER (XT only)
AH = 0Fh
DL = drive number (80h = first, 81h = second hard disk)
ES:BX -> buffer
Return: CF set on error
CF clear if successful
AH = status code (see #0140)
Notes: does not write data to the drive
should be called before formatting to initialize an XT-type
controller's sector buffer
used for diagnostics only on PS/2 systems
SeeAlso: AH=0Bh
--------B-1310-------------------------------
INT 13 - HARD DISK - CHECK IF DRIVE READY
AH = 10h
DL = drive number (80h = first, 81h = second hard disk)
Return: CF set on error
CF clear if successful
AH = status (see #0140 at AH=01h)
--------B-1311-------------------------------
INT 13 - HARD DISK - RECALIBRATE DRIVE
AH = 11h
DL = drive number (80h = first, 81h = second hard disk)
Return: CF set on error
CF clear if successful
AH = status (see #0140 at AH=01h)
Note: causes hard disk controller to seek the specified drive to cylinder 0
SeeAlso: AH=00h,AH=0Ch,AH=19h"FIXED DISK"
--------B-1312-------------------------------
INT 13 - HARD DISK - CONTROLLER RAM DIAGNOSTIC (XT,PS)
AH = 12h
DL = drive number (80h = first, 81h = second hard disk)
Return: CF set on error
CF clear if successful
AH = status code (see #0140 at AH=01h)
AL = 00h
SeeAlso: AH=13h,AH=14h
--------d-1312-------------------------------
INT 13 - Future Domain SCSI CONTROLLER - STOP SCSI DISK
AH = 12h
DL = hard drive ID
Return: CF set on error
CF clear if successful
AH = status code (see #0140 at AH=01h)
Notes: available at least on the TMC-870 8-bit SCSI controller BIOS v6.0A
if the given drive is a SCSI device, the SCSI Stop Unit command is sent
and either "Disk prepared for shipping" or "Disk Stop command failed"
is displayed
the TMC-950 does not support any Future Domain BIOS calls; instead,
it provides a full CAM implementation (see INT 4F/AX=8100h)
--------d-1312-------------------------------
INT 13 - SyQuest - START/STOP SCSI DISK
AH = 12h
AL = subfunction
00h start disk
01h stop disk
CX = wait flag
00h wait for ready
01h don't wait for ready
DL = hard drive ID (bit 7 for hard disks must be set)
Return: CF set on error
CF clear if successful
AH = status
00h successful
01h invalid function request
80h timeout
SeeAlso: AH=12h"Future Domain",AH=13h"SyQuest"
--------B-1313-------------------------------
INT 13 - HARD DISK - DRIVE DIAGNOSTIC (XT,PS)
AH = 13h
DL = drive number (80h = first, 81h = second hard disk)
Return: CF set on error
CF clear if successful
AH = status code (see #0140 at AH=01h)
AL = 00h
SeeAlso: AH=12h"HARD DISK",AH=14h"HARD DISK"
--------d-1313-------------------------------
INT 13 - SyQuest - READ DRIVE PARAMATERS (for DOS 5+)
AH = 13h
DL = drive ID (bit 7 set for hard disks)
Return: CF set on error
AH = status (07h) (see #0140 at AH=01h)
CF clear if successful
AH = 00h
BL = drive type (AT/PS2 floppies only) (see #0148)
CH = low eight bits of maximum cylinder number
CL = maximum sector number (bits 5-0)
high two bits of maximum cylinder number (bits 7-6)
DH = maximum head number
DL = number of drives
ES:DI -> drive parameter table (floppies only)
Notes: the return values are identical to the standard INT 13/AH=08h, but the
number of drives is not limited to 2, so
scanning all possible drive numbers with the Read DASD Type call
(AH=15h) should generally be preferred to determine the number of
drives attached to the system.
SeeAlso: AH=08h,AH=12h"SyQuest",AH=15h,AH=59h"SyQuest"
--------B-1314-------------------------------
INT 13 - HARD DISK - CONTROLLER INTERNAL DIAGNOSTIC
AH = 14h
Return: CF set on error
CF clear if successful
AH = status code (see #0140 at AH=01h)
AL = 00h
SeeAlso: AH=12h,AH=13h
--------B-1315-------------------------------
INT 13 - DISK - GET DISK TYPE (XT 1/10/86 or later,XT286,AT,PS)
AH = 15h
DL = drive number (bit 7 set for hard disk)
Return: CF clear if successful
AH = type code
00h no such drive
01h floppy without change-line support
02h floppy with change-line support
03h hard disk
CX:DX = number of 512-byte sectors
CF set on error
AH = status (see #0140 at AH=01h)
Note: SyQuest can report type 01h or 02h for 'hard disks', since its media
is removable
SeeAlso: AH=08h,AH=16h,AH=17h,AH=19h"SCSI"
--------B-1316-------------------------------
INT 13 - FLOPPY DISK - DETECT DISK CHANGE (XT 1/10/86 or later,XT286,AT,PS)
AH = 16h
DL = drive number (00h-7Fh)
Return: CF clear if change line inactive
AH = 00h (disk not changed)
CF set if change line active
AH = status
01h invalid command (SyQuest)
06h change line active or not supported
80h drive not ready or not present
Notes: call AH=15h first to determine whether the drive supports a change
line
this call also clears the media-change status, so that a disk change
is only reported once
SeeAlso: AH=15h,AH=49h

--------B-1317-------------------------------
INT 13 - FLOPPY DISK - SET DISK TYPE FOR FORMAT (AT,PS)
AH = 17h
AL = format type
01h = 320/360K disk in 360K drive
02h = 320/360K disk in 1.2M drive
03h = 1.2M disk in 1.2M drive
04h = 720K disk in 720K or 1.44M drive
DL = drive number
Return: CF set on error
CF clear if successful
AH = status (see #0140 at AH=01h)
Note: this function does not handle 1.44M drives; use AH=18h instead
SeeAlso: AH=15h,AH=18h
--------d-131700-----------------------------
INT 13 - Future Domain SCSI CONTROLLER - GET INQUIRY INFO FROM SCSI DEVICE
AX = 1700h
CL = length of buffer
DL = hard drive ID
ES:BX -> buffer for info (see #0149)
Return: CF clear if successful
CH = number of bytes returned in buffer???
CF set on error
AH = status code (see #0140 at AH=01h)
Notes: this function is not available with 8-bit controller ROM versions < 7.0
information block bytes 5-n are vendor-specific in older SCSI devices
the TMC-950 does not support any Future Domain BIOS calls; instead,
it provides a full CAM implementation (see INT 4F/AX=8100h)
SeeAlso: AH=18h"SCSI",AH=1Bh"SCSI"

Format of Future Domain SCSI inquiry information block:
Offset Size Description (Table 0149)
00h BYTE device type
bits 0-4: peripheral device type (see #0150)
bits 5-7: peripheral qualifier (see #0151)
01h BYTE device type modifier
bits 0-6: device type modifier
bit 7: removable medium
02h BYTE SCSI version (see #0152)
03h BYTE data format/capabilities (see #0153)
04h BYTE additional data length (total remaining bytes)
05h 2 BYTEs reserved
07h BYTE device capabilities (see #0154)
08h 8 BYTEs vendor identification (space-padded ASCII)
10h 8 BYTEs product identification (space-padded ASCII)
20h 4 BYTEs product revision level (space-padded ASCII)
24h 20 BYTEs vendor specific
38h 40 BYTEs reserved
60h var vendor specific parameters

(Table 0150)
Values for Future Domain SCSI peripheral device type:
00h direct-access device (e.g., magnetic disk)
01h sequential-access device (e.g., magnetic tape)
02h printer device
03h processor device
04h write-once device (e.g., some optical disks)
05h CD-ROM device
06h scanner device
07h optical memory device (e.g., some optical disks)
08h medium changer device (e.g., jukeboxes)
09h communications device
0Ah (defined by ASC IT8)
0Bh (defined by ASC IT8)
0Ch-1Eh reserved
1Fh unknown or no device type

(Table 0151)
Values for Future Domain SCSI peripheral qualifier:
000b device is currently connected to this logical unit and available
001b target is capable of supporting the specified peripheral, but the
physical device is not currently connected to this logical unit
010b reserved
011b target can't support a physical device on this logical unit
1xxb vendor specific

Bitfields for Future Domain SCSI version:
Bit(s) Description (Table 0152)
0-2 ANSI-approved version
000 device might or might not comply to ANSI standard
001 device complies to ANSI SCSI-1
010 device complies to ANSI SCSI-2
other reserved
3-5 ECMA version
6-7 ISO version

Bitfields for Future Domain SCSI data format/capabilities:
Bit(s) Description (Table 0153)
0-2 response data format
000 information block is as specified in SCSI-1
001 information block is as specified in CCS
010 information block is as specified in SCSI-2
other reserved
4-5 reserved
6 terminate I/O process supported
7 asynchronous event notification supported

Bitfields for Future Domain SCSI device capabilities:
Bit(s) Description (Table 0154)
0 device responds to RESET with a hard RESET
1 tagged command queuing supported
2 reserved
3 linked commands supported
4 synchronous data transfer supported
5 16-transfers supported
6 32-transfers supported
7 relative addressing supported
--------B-1318-------------------------------
INT 13 - DISK - SET MEDIA TYPE FOR FORMAT (AT model 3x9,XT2,XT286,PS)
AH = 18h
DL = drive number
CH = lower 8 bits of highest cylinder number (number of cylinders - 1)
CL = sectors per track (bits 0-5)
top 2 bits of highest cylinder number (bits 6,7)
Return: AH = status
00h requested combination supported
01h function not available
0Ch not supported or drive type unknown
80h there is no disk in the drive
ES:DI -> 11-byte parameter table (see #0572 at INT 1E)
SeeAlso: AH=05h,AH=07h,AH=17h
--------d-1318-------------------------------
INT 13 - Future Domain SCSI BIOS - GET SCSI CONTROLLER INFORMATION
AH = 18h
DL = hard drive ID
Return: CF set on error
AH = status code (see #0140 at AH=01h)
CF clear if successful
AX = 4321h (magic number)
CX = controller family code (see #0155)
---if family code=0200h
DH = number of exclusively ROM-controlled SCSI devices
DL = canonical SCSI device number for specified drive
---if family code <> 0200h
BH = number of exclusively ROM-controlled SCSI devices
BL = canonical SCSI device number for specified drive
Notes: also sets an internal flag (non-resettable) which prevents some
controller messages from being displayed, allows writes to
removable devices (use caution!), and enables the INT 13 interface
for more than one drive (i.e. DL >= 81h) in at least some ROM
versions
the TMC-950 does not support any Future Domain BIOS calls; instead,
it provides a full CAM implementation (see INT 4F/AX=8100h)
SeeAlso: AH=05h"SCSI",AX=1700h"SCSI",AH=1Bh"SCSI",INT 4F/AX=8100h

(Table 0155)
Values for Future Domain SCSI controller family code:
0200h TMC-1680/? (ROM 3.0)
0203h TMC-1650/1660/1670/1680 (ROM 2.0)
040Ah TMC-820/830/840/850/860/870/875/880/885 (ROM <= 6.0A)
050Dh TMC-840/841/880/881 (ROM 5.2D)
0700h TMC-830/850/860/875/885 (ROM 7.0)
--------B-1318--CXD2C9-----------------------
INT 13 - XDF.COM - API
AH = 18h
CX = D2C9h ("R"+80h, "I"+80h = Roger Ivey)
DX = 0
BX = function
0000h installation check
Return: AH = 0Ch
CX = 7269h ("ri" = Roger Ivey)
ES = segment of driver
CF set
2F64h ("/d") disable the driver
Return: AH = 0Ch
ES:BX = pointer to activation flag (it is set to 0:
set it to 1 to enable the driver again)
CX = 7269h
CF set
2F75h ("/u") unload the driver (restore interrupts & free memory)
Return: AH = 0Ch
DL = 55h ("U") if successful
= 0h if fails
CX = 7269h
ES = segment of driver
CF set
AL, BX, DH, and DI destroyed
Program: XDF is a TSR provided with PC-DOS 7.0 to support XDF 1.84M disks,
developed by Roger D. Ivey
Note: After disabling or enabling the driver, a disk change must be performed
or simulated to reset the driver.
--------B-1319-------------------------------
INT 13 - FIXED DISK - PARK HEADS ON ESDI DRIVE (XT286,PS)
AH = 19h
DL = drive
Return: CF set on error
CF clear if successful
AH = status (see #0140 at AH=01h)
SeeAlso: AH=11h
--------d-1319-------------------------------
INT 13 - Future Domain SCSI CONTROLLER - REINITIALIZE DRIVE
AH = 19h
DL = hard drive ID
Return: CF set on error
AH = status code (see #0140 at AH=01h)
CF clear if successful
AH = disk type (03h = fixed disk)
CX:DX = number of 512-byte sectors
Notes: sends SCSI Read Capacity command to get number of logical blocks and
adjusts the result for 512-byte sectors
displays either "Error in Read Capacity Command" or "nnn Bytes per
sector" (nnn=256 or 512, the only sizes supported in the translation
code)
should probably be called when a removable device has its media changed
returns the same values as AH=15h
the TMC-950 does not support any Future Domain BIOS calls; instead,
it provides a full CAM implementation (see INT 4F/AX=8100h)
SeeAlso: AH=15h,AH=1Ah,INT 4F/AX=8100h
--------d-131A-------------------------------
INT 13 - ESDI FIXED DISK - FORMAT UNIT (PS)
AH = 1Ah
AL = defect table entry count
CL = format modifiers (see #0156)
DL = drive (80h,81h)
ES:BX -> defect table (see #0157), ignored if AL=00h
Return: CF set on error
CF clear if successful
AH = status (see #0140 at AH=01h)
Note: if periodic interrupt selected, INT 15/AH=0Fh is called after each
cylinder is formatted
SeeAlso: AH=07h,INT 15/AH=0Fh

Bitfields for ESDI format modifiers:
Bit(s) Description (Table 0156)
4 generate periodic interrupt
3 perform surface analysis
2 update secondary defect map
1 ignore secondary defect map
0 ignore primary defect map

Format of defect table entry [array]:
Offset Size Description (Table 0157)
00h 3 BYTEs relative sector address (little-endian)
03h BYTE flags and defect count
bit 7: last logical sector on track
bit 6: first logical sector on track
bit 5: last logical sector on cylinder
bit 4: logical sectors are pushed onto next track
bits 3-0: number of defects pushed from previous cylinder
--------d-131A-------------------------------
INT 13 - Future Domain SCSI CONTROLLER - GET SCSI PARTIAL MEDIUM CAPACITY
AH = 1Ah
CH = track (bits 8,9 in high bits of CL)
CL = sector (01h to number of sectors/track for drive)
DH = head
DL = hard drive ID
Return: CF set on error
AH = status code (see #0140 at AH=01h)
CX:DX = logical block number of last quickly-accessible block after
given block
Notes: sends SCSI Read Capacity command with the PMI bit set to obtain the
logical block address of the last block after which a substantial
delay in data transfer will be encountered (usually the last block
on the current cylinder). No translation to 512 byte sectors is
performed on the result if data is stored on the disk in other than
512 byte sectors.
the TMC-950 does not support any Future Domain BIOS calls; instead,
it provides a full CAM implementation (see INT 4F/AX=8100h)
SeeAlso: AH=15h,AH=19h"SCSI"
--------d-131B-------------------------------
INT 13 - ESDI FIXED DISK - GET MANUFACTURING HEADER
AH = 1Bh
AL = number of sectors to read
DL = drive
ES:BX -> buffer for manufacturing header (defect list)
Return: CF set on error
CF clear if successful
AH = status
Note: manufacturing header format (Defect Map Record format) can be found
in IBM 70MB, 115MB Fixed Disk Drives Technical Reference
the first sector read contains the manufacturing header with the number
of defect entries and the beginning of the defect map; the remaining
sectors contain the remainder of the defect map
--------d-131B-------------------------------
INT 13 - Future Domain SCSI CONTROLLER - GET POINTER TO SCSI DISK INFO BLOCK
AH = 1Bh
DL = hard drive ID
Return: CF set on error
AH = status code (see #0140 at AH=01h)
CF clear if successful
ES:BX -> SCSI disk information block (see #0158)
Notes: also sets a non-resettable flag which prevents some controller messages
from being displayed
the TMC-950 does not support any Future Domain BIOS calls; instead,
it provides a full CAM implementation (see INT 4F/AX=8100h)
SeeAlso: AH=18h"SCSI",AH=1Ch"SCSI"

Format of Future Domain SCSI disk information block:
Offset Size Description (Table 0158)
00h BYTE drive physical information (see #0159)
01h WORD translated number of cylinders
03h BYTE translated number of heads
04h BYTE translated number of sectors per track (17, 34, or 63)
05h BYTE drive address
bits 0-2: logical unit number
bits 3-5: device number
06h BYTE 01h at initialization
07h BYTE sense code byte 00h, or extended sense code byte 0Ch
08h BYTE 00h
09h BYTE 00h or extended sense code byte 02h (sense key)
0Ah BYTE 00h
0Bh 10 BYTEs copy of Command Descriptor Block (CDB)
15h DWORD translated number of sectors on device

Bitfields for Future Domain SCSI device physical information:
Bit(s) Description (Table 0159)
0 ???
1 device uses parity
2 256 bytes per sector instead of 512
3 don't have capacity yet???
4 disk is removable
5 logical unit number is not present
--------d-131C-------------------------------
INT 13 - Future Domain SCSI CONTROLLER - GET POINTER TO FREE CONTROLLER RAM
AH = 1Ch
DL = hard drive ID (any valid SCSI hard disk)
Return: CF set on error
AH = status code (see #0140 at AH=01h)
CF clear if successful
ES:BX -> first byte of free RAM on controller
Notes: the Future Domain TMC-870 contains 1024 bytes of RAM at offsets 1800h
to 1BFFh on-board the controller for storing drive information and
controller status; ES:BX points to the first byte available for other
uses
ES contains the segment at which the controller resides; the
controller's two memory-mapped I/O ports are at offsets 1C00h, 1E00h
SeeAlso: AH=1Bh"SCSI"
--------d-131C-------------------------------
INT 13 U - ESDI FIXED DISK - ???
AH = 1Ch
AL = subfunction (01h-06h)
DL = drive (80h,81h)
???
Return: ???
Note: these functions perform a controller command 0612h without DMA
--------d-131C08-----------------------------
INT 13 U - ESDI FIXED DISK - GET COMMAND COMPLETION STATUS
AX = 1C08h
DL = drive (80h,81h)
ES:BX -> buffer for Command Complete Status Block (see #0160)
Return: CF set on error

CF clear if successful
AH = status (see #0140 at AH=01h)
SeeAlso: AX=1C09h,AX=1C0Ah

Format of ESDI Command Complete Status Block:
Offset Size Description (Table 0160)
00h BYTE 07h
01h BYTE size of block in words (07h)
02h BYTE command error code (see #0161)
03h BYTE command status code (see #0162)
04h BYTE device error code, group 1 (see #0163)
05h BYTE device error flags, group 2 (see #0164)
06h WORD number of unprocessed sectors due to abnormal termination
08h DWORD last Relative Sector Address processed by command
0Ch WORD number of sectors corrected by ECC codes

(Table 0161)
Values for ESDI command error code:
00h successful
01h parameter invalid
02h unknown function
03h unsupported command
04h command cancelled
05h unknown function
06h controller diagnostics failed
07h formatting failed
08h format error in primary map
09h format error in secondary map
0Ah diagnostic failure during formatting
0Bh warning: secondary map too large during formatting
0Ch warning: non-zero defect
0Dh system checksum error during formatting
0Eh warning: incompatible device
0Fh warning: push table overflowed
10h warning: more than 15 sectors pushed to next cylinder
11h internal hardware error
12h warning: errors found while verifying sectors
13h invalid device
FFh device error

(Table 0162)
Values for ESDI command status code:
01h successful
03h successful after ECC
05h successful after retries
06h format partially completed
07h successful after ECC and retries
08h command completed with warning (see #0161)
09h abort complete
0Ah reset complete
0Bh data transfer ready (no status block)
0Ch command completed with failure (see #0163,#0164)
0Dh DMA error
0Eh command block error (see #0161)
0Fh bad attention code

(Table 0163)
Values for ESDI device error code, group 1:
00h successful
01h seek fault detected by device
02h interface fault
03h sector ID not found
04h disk not formatted
05h unrecoverable ECC error
06h ECC error in sector ID
07h invalid relative sector address
08h timeout
09h sector defective
0Ah disk changed (removable media)
0Bh selection error
0Ch write protected (removable media)
0Dh write fault
0Eh read fault
0Fh no index or sector pulse
10h device not ready
11h seek error detected by adapter
12h bad format
13h volume overflow
14h data address mark not found
15h sector ID not found
16h missing device configuration data
17h first/last relative sector flags missing
18h track empty
81h timeout while waiting for stop
82h timeout while waiting for end of data transfer
84h stopped awaiting data transfer during formatting
85h timeout while waiting for head switch
86h timeout while awaiting DMA completion

Bitfields for ESDI device error flags, group 2:
Bit(s) Description (Table 0164)
7-5 unused
4 ready
3 selected
2 write fault
1 on track 0
0 seek/command complete
--------d-131C09-----------------------------
INT 13 U - ESDI FIXED DISK - GET DEVICE STATUS
AX = 1C09h
DL = drive (80h,81h)
ES:BX -> buffer for Device Status Block (see #0165)
Return: CF set on error
CF clear if successful
AH = status (see #0140 at AH=01h)
SeeAlso: AX=1C08h,AX=1C0Ah

Format of ESDI Device Status Block:
Offset Size Description (Table 0165)
00h BYTE 08h
01h BYTE number of words in block (09h)
02h BYTE error flags
03h BYTE unused
04h BYTE command error code (see #0161)
05h BYTE command status code (see #0162)
06h WORD ESDI standard status
08h 5 WORDs ESDI vendor-specific status codes
--------d-131C0A-----------------------------
INT 13 U - ESDI FIXED DISK - GET DEVICE CONFIGURATION
AX = 1C0Ah
DL = drive (80h,81h)
ES:BX -> buffer for Drive Configuration Status Block (see #0166)
Return: CF set on error
CF clear if successful
AH = status (see #0140 at AH=01h)
Note: device configuration format can be found in IBM ESDI Fixed Disk Drive
Adapter/A Technical Reference
SeeAlso: AX=1C08h,AX=1C0Bh,AX=1C0Ch

Format of ESDI Drive Configuration Status Block:
Offset Size Description (Table 0166)
00h BYTE 09h
01h BYTE number of words in block (06h)
02h BYTE flags
03h BYTE number of spare sectors per cylinder
04h DWORD total number of usable sectors
08h WORD total number of cylinders
0Ah BYTE tracks per cylinder
0Bh BYTE sectors per track
--------d-131C0B-----------------------------
INT 13 U - ESDI FIXED DISK - GET ADAPTER CONFIGURATION
AX = 1C0Bh
ES:BX -> buffer for Controller Configuration Status Block (see #0167)
Return: CF set on error
CF clear if successful
AH = status (see #0140 at AH=01h)
SeeAlso: AX=1C0Ch

Format of ESDI Controller Configuration Status Block:
Offset Size Description (Table 0167)
00h BYTE E9h
01h BYTE number of words in block (06h)
02h WORD unused (0000h)
04h DWORD controller microcode revision level
08h 2 WORDs unused (0000h)
--------d-131C0C-----------------------------
INT 13 U - ESDI FIXED DISK - GET POS INFORMATION
AX = 1C0Ch
ES:BX -> buffer for POS Information Status Block (see #0168)
Return: CF set on error
CF clear if successful
AH = status (see #0140 at AH=01h)
SeeAlso: AX=1C0Bh

Format of ESDI POS Information Status Block:
Offset Size Description (Table 0168)
00h BYTE EAh
01h BYTE number of words in block (05h)
02h WORD magic value FFDDh
04h BYTE POS register 3
05h BYTE POS register 2
06h BYTE POS register 5 (unused, FFh)
07h BYTE POS register 4 (unused, FFh)
08h BYTE POS register 7 (unused, FFh)
09h BYTE POS register 6 (unused, FFh)
--------d-131C0D-----------------------------
INT 13 U - ESDI FIXED DISK - ???
AX = 1C0Dh
DL = drive (80h,81h)
???
Return: ???
Note: invokes controller command 0614h without DMA
SeeAlso: AH=1Ch"ESDI",AX=1C0Fh
--------d-131C0E-----------------------------
INT 13 U - ESDI FIXED DISK - TRANSLATE RBA TO ABA
AX = 1C0Eh
CH = low 8 bits of cylinder number
CL = sector number, high two bits of cylinder number in bits 6 and 7
DH = head number
DL = drive number (80h,81h)
ES:BX -> ABA number
Return: CF set on error
CF clear if successful
AH = status (see #0140 at AH=01h)
Note: ABA (absolute block address) format can be found in IBM ESDI Adapter
Technical Reference by using its Device Configuration Status Block
--------d-131C0F-----------------------------
INT 13 U - ESDI FIXED DISK - ???
AX = 1C0Fh
DL = drive (80h,81h)
???
Return: ???
Note: invokes controller command 0614h without DMA
SeeAlso: AH=1Ch"ESDI",AX=1C0Dh,AX=1C12h
--------d-131C12-----------------------------
INT 13 U - ESDI FIXED DISK - ???
AX = 1C12h
DL = drive (80h,81h)
???
Return: ???
Note: invokes controller command 0612h without DMA
SeeAlso: AH=1Ch"ESDI",AX=1C0Fh
--------c-131D-------------------------------
INT 13 - IBMCACHE.SYS - CACHE STATUS
AH = 1Dh
AL = subfunction
01h get status record
DL = drive???
Return: ES:BX -> status record (see #0169)
CF set on error
AH = error code
02h set cache status
ES:BX -> status record (see #0169)
DL = drive???
Return: CF set on error

Format of IBMCACHE.SYS status record:
Offset Size Description (Table 0169)
00h DWORD total number of read requests
04h DWORD total number of hits
08h DWORD number of physical disk reads
0Ch DWORD total number of sectors requested by physical disk reads
10h 6 BYTEs ???
16h DWORD pointer to start of error list (see #0170)
1Ah DWORD pointer to end of error list
1Eh WORD ???
20h BYTE using extended memory if nonzero
21h BYTE ???
22h 4 BYTEs ASCII version number
26h WORD cache size in KB
28h WORD sectors per page

Format of IBMCACHE.SYS error list:
Offset Size Description (Table 0170)
00h DWORD relative block address of bad page
04h BYTE drive
05h BYTE sector bit-map
06h WORD next error
--------d-131F-------------------------------
INT 13 - SyQuest - DOOR LATCH/DOOR BUTTON DETECT
AH = 1Fh
AL = subfunction
00h allow media removal
01h prevent media removal (lock door)
DL = drive ID (bit 7 set for hard disks)
Return: CF clear if successful
AH = 00h
CF set on error
AH = error code
00h successful
01h invalid function request
80h timeout
DDh media change requested
SeeAlso: AH=12h"SyQuest",AH=13h"SyQuest",AH=59h"SyQuest"
--------d-1320-------------------------------
INT 13 - DISK - ??? (Western Digital "Super BIOS")
AH = 20h
???
Return: ???
Notes: returns some kind of status related to whether the drive contains its
default media type
QEMM v6.00 calls INT 13/AX=2000h/DL=81h in some cases
--------b-1320-------------------------------
INT 13 U - Compaq DESKPRO/i - GET CURRENT MEDIA FORMAT
AH = 20h
DL = drive number (00h,01h)
Return: CF clear if successful
AL = media type (see #0171)
CF set on error
AH = error code
31h no such drive
32h incorrect drive type stored in CMOS
Note: this function is supported by the 3/8/93 ROM BIOS, but only partially
(AL is always 00h when successful) by the 8/3/93 version

(Table 0171)
Values for Compaq diskette media type:
03h 720K
04h 1.44M
06h 2.88M
0Ch 360K
0Dh 1.2M
0Eh ???
0Fh ??? (1024-byte sectors)
--------c-1320-------------------------------
INT 13 u - QUICKCACHE II v4.20 - DISMOUNT
AH = 20h
AL = drive (00h = A:, etc. or 7Fh for all removable drives???
or FFh for all drives)
Return: AX = status (0000h successful)
Program: QUICKCACHE II is a shareware disk cache by P.R. Glassel and
Associates, Inc.
Desc: flush any dirty buffers for the specified drive(s) and then discard
those sector buffers
SeeAlso: AH=21h"QUICKCACHE",AH=22h"QUICKCACHE",AH=28h
--------d-1321-------------------------------
INT 13 - HARD DISK - PS/1 and newer PS/2 - READ MULTIPLE DISK SECTORS
AH = 21h
AL = number of sectors to write
CH = low byte of 12-bit cylinder number
CL = starting sector (bits 0-5) and bits 8-9 of cylinder (bits 6-7)
DH = head number (bits 0-5) and bits 10-11 of cylinder (bits 6-7)
DL = drive number (80h,81h)
ES:BX -> buffer for data to be read
Return: CF clear if successful
ES:BX buffer filled
CF set on error
AH = status (see #0140 at AH=01h)
Desc: read from the disk using the Multiple Block mode available on newer
IDE drives and some hard disk controllers, which generates an
interrupt only after the end of transferring a group of sectors
rather than after each sector
Notes: must call AH=24h"PS/1" before using this function
input values in CL and DH are not range-checked
the byte at address 0040h:0074h is set to the status of the operation
SeeAlso: AH=02h,AH=22h"PS/1",AH=23h"PS/1",AH=24h"PS/1"
--------c-1321-------------------------------
INT 13 u - QUICKCACHE II v4.20 - FLUSH CACHE
AH = 21h
Return: AX = status (0000h successful)
Desc: immediately write all dirty sectors back to disk
SeeAlso: AH=25h"QUICKCACHE",AH=2Eh,AH=2Fh
--------d-1322-------------------------------
INT 13 - HARD DISK - PS/1 and newer PS/2 - WRITE MULTIPLE DISK SECTORS
AH = 22h
AL = number of sectors to write
CH = low byte of 12-bit cylinder number
CL = starting sector (bits 0-5) and bits 8-9 of cylinder (bits 6-7)
DH = head number (bits 0-5) and bits 10-11 of cylinder (bits 6-7)
DL = drive number (80h,81h)
ES:BX -> buffer containing data to be written
Return: CF clear if successful
CF set on error
AH = status (see #0140 at AH=01h)
Desc: write to the disk using the Multiple Block mode available on newer
IDE drives and some hard disk controllers, which generates an
interrupt only after the end of transferring a group of sectors
rather than after each sector
Notes: must call AH=24h"PS/1" before using this function
input values in CL and DH are not range-checked
the byte at address 0040h:0074h is set to the status of the operation
SeeAlso: AH=03h,AH=21h"PS/1",AH=23h"PS/1",AH=24h"PS/1"
--------c-1322-------------------------------
INT 13 u - QUICKCACHE II v4.20 - ENABLE/DISABLE CACHE
AH = 22h
AL = new state (00h disabled, 01h enabled)
Return: AX = status (0000h successful)
Note: enables/disables caching of all drives
SeeAlso: AH=2Ch,AH=2Dh,AH=32h,AH=33h,AH=A3h,AH=A4h
--------d-1323-------------------------------
INT 13 U - HARD DISK - PS/1 and newer PS/2 - SET CONTROLLER FEATURES REGISTER
AH = 23h
AL = feature number (see #0172)
DL = drive number (80h,81h)
???
Return: CF clear if successful
CF set on error
AH = status (see #0140 at AH=01h)
SeeAlso: AH=21h"PS/1",AH=22h"PS/1",AH=24h"PS/1",AH=25h"PS/1"

(Table 0172)
Values for PS/1 hard disk feature number:
01h select 8-bit data transfers instead of 16-bit
02h enable write cache
22h Write Same, user-specified area
33h disable retries
44h set number of ECC bytes for read long/write long (see AH=0Ah,AH=0Bh)
54h set cache segments
55h disable lookahead
66h disable reverting to power-on defaults
77h disable error correctioni
81h select 16-bit data transfers (default)
82h disable write cache
88h enable error correction (default)
99h enable retries (default)
AAh enable lookahead
BBh set ECC length for read long/write long to four bytes
CCh enable reverting to power-on defaults
DDh Write Same, entire disk
--------c-1323-------------------------------
INT 13 U - QUICKCACHE II v4.20 - GET ??? ADDRESS
AH = 23h
Return: AX = status (0000h successful)
ES = segment of ??? data
--------d-1324-------------------------------
INT 13 - HARD DISK - PS/1 and newer PS/2 - SET MULTIPLE MODE
AH = 24h
AL = number of sectors per block (2,4,8,16)
DL = drive number (80h,81h)
Return: CF clear if successful
CF set onerror
AH = status (see #0140 at AH=01h)
Desc: specify how many sectors the controller should transfer as a group
between operation-complete interrupts when using the Read Multiple
and Write Multiple functions (AH=21h,AH=22h)
Notes: set the number of sectors to 0 to disable multiple-transfer mode
the maximum value for the block size depends on the fixed disk
drive type. The value is stored in byte 15h of the fixed disk
drive parameter table that is created by POST.
the byte at address 0040h:0074h is set to status of operation.
SeeAlso: AH=21h"PS/1",AH=22h"PS/1",AH=23h"PS/1",AH=25h"PS/1"
--------c-1324-------------------------------
INT 13 u - QUICKCACHE II v4.20 - SET SECTORS
AH = 24h
BX = new number of sector buffers in cache
Return: AX = status
0000h successful
0001h failed--size adjusted
8000h cache cannot be resized while enabled
SeeAlso: AH=36h
--------d-1325-------------------------------
INT 13 - HARD DISK - PS/1 and newer PS/2 - IDENTIFY DRIVE
AH = 25h
DL = drive number (80h,81h)
ES:BX-> 512 byte buffer for reply packet
Return: CF clear if successful
CF set on error
AH = status (see #0140 at AH=01h)
buffer filled with ATA/IDE-style drive information block (see #0173)
Desc: retrieves the 256 words of drive data stored on an IDE hard disk
Note: the byte at address 0040h:0074h is set to the status of the operation
SeeAlso: AH=23h"PS/1"

Format of drive information block:
Offset Size Description (Table 0173)
00h WORD general drive configuration (see #0174)
02h WORD number of cylinders
04h WORD reserved
06h WORD number of heads
08h WORD number of unformatted bytes per track
0Ah WORD number of unformatted bytes per sector
0Ch WORD number of sectors per track
0Eh 6 BYTEs vendor unique
14h 20 BYTEs serial number in ASCII, 0000h=not specified)
28h WORD buffer type
2Ah WORD buffer size in 512 byte increments (0000h=not specified)
2Ch WORD number of ECC bytes passed on Read/Write Long cmds
0000h = not specified
2Eh 8 BYTEs firmware revision in ASCII, 0000h=not specified
36h 40 BYTEs model number in ASCII, 0000h=not specified
5Eh WORD bits 15-8 Vendor Unique
bits 7-0 00h = Read/Write Multiple commands not implemented
xxh = Maximum number of sectors that can be
transferred per interrupt on Read and Write
Multiple commands
60h WORD 0000h = cannot perform doubleword I/O
0001h = can perform doubleword I/O
62h WORD capabilities
bit 15-9 0=reserved
bit 8 1=DMA Supported
bit 7-0 Vendor Unique
64h WORD reserved
66h WORD bits 15-8 PIO data transfer cycle timing mode
bits 7-0 Vendor Unique
68h WORD bits 15-8 DMA data transfer cycle timing mode
bits 7-0 Vendor Unique
6Ah WORD bits 15-1 reserved
bit 0 1=the fields reported in tranlation mode are valid
0=the fields reported in translation mode may be valid
6Ch WORD number of current cylinders
6Eh WORD number of current heads
70h WORD number of current sectors per track
72h DWORD current capacity in sectors
76h WORD reserved
78h 136 BYTEs not defined by ATA spec 2.6
100h 64 BYTEs vendor unique
140h 96 BYTEs reserved
Note: the above description is as in the ATA (AT Attachment) Specification.

Bitfields for general drive configuration:
Bit(s) Description (Table 0174)
15 0 reserved for non-magnetic drives
14 format speed tolerance gap required
13 track offset option available
12 data strobe offset option available
11 rotational speed tolerance is > 0.5%
10 disk transfer rate > 10 Mbs
9 disk transfer rate > 5Mbs but <= 10Mbs
8 disk transfer rate <= 5Mbs
7 removable cartridge drive
6 fixed drive
5 spindle motor control option implemented
4 head switch time > 15 usec
3 not MFM encoded
2 soft sectored
1 hard sectored
0 reserved (0)
--------c-1325-------------------------------
INT 13 u - QUICKCACHE II v4.20 - SET FLUSH INTERVAL
AH = 25h
BX = interval
Return: AX = status (0000h successful)
Desc: specify how often the cache should write dirty buffers to disk when
buffered writes are enabled
SeeAlso: AH=21h"QUICKCACHE",AH=2Ch,AH=2Eh
--------c-1326-------------------------------
INT 13 U - QUICKCACHE II v4.20 - UNINSTALL
AH = 26h
Return: AX = status
0000h successful
0001h-00FFh interrupt vector which was hooked by another TSR
SeeAlso: AH=27h
--------c-1327--BX0000-----------------------
INT 13 u - QUICKCACHE II v4.20 - INSTALLATION CHECK
AH = 27h
BX = 0000h
Return: AX = 0000h if installed
BX nonzero if installed
BH = major version
BL = binary minor version
Program: QUICKCACHE II is a shareware disk cache by P.R. Glassel and
Associates, Inc.
SeeAlso: AH=26h,AH=A0h,INT 16/AX=FFA5h/CX=1111h
--------c-1328-------------------------------
INT 13 U - QUICKCACHE II v4.20 - SET AUTOMATIC DISMOUNT
AH = 28h
AL = new state (00h disabled, 01h enabled)
Return: AX = status (0000h successful)
SeeAlso: AH=20h"QUICKCACHE"
--------c-1329-------------------------------
INT 13 U - QUICKCACHE II v4.20 - NOP
AH = 29h
Return: AX = 0000h
--------c-132A-------------------------------
INT 13 u - QUICKCACHE II v4.20 - SET BUFFER SIZE
AH = 2Ah
AL = buffer size (1-30)
Return: AX = status (0000h successful)
Desc: specify the number of cache sector buffers to dedicate to buffered read
and write operations
SeeAlso: AH=2Ch,AH=2Dh,AH=39h,AH=3Ah
--------c-132B-------------------------------
INT 13 U - QUICKCACHE II v4.20 - DRIVE ACCESS SOUNDS
AH = 2Bh
AL = new state (00h disabled, 01h enabled)
Return: AX = status (0000h successful)
--------c-132C-------------------------------
INT 13 u - QUICKCACHE II v4.20 - SET BUFFERED WRITES
AH = 2Ch
AL = new state (00h disabled, 01h enabled)
Return: AX = status (0000h successful)
Desc: specify whether the cache should delay disk writes
Note: this function enables or disables delayed writes for all drives; use
AH=38h to change a single drive
SeeAlso: AH=25h"QUICKCACHE",AH=2Dh,AH=2Eh,AH=38h
--------c-132D-------------------------------
INT 13 u - QUICKCACHE II v4.20 - SET BUFFERED READ
AH = 2Dh
AL = new state (00h disabled, 01h enabled)
Return: AX = status (0000h successful)
Desc: specify whether the cache should attempt to read ahead of actual
requests
Note: this function enables or disables read-ahead for all drives; use AH=37h
to change a single drive
SeeAlso: AH=2Ch,AH=37h
--------c-132E-------------------------------
INT 13 u - QUICKCACHE II v4.20 - SET FLUSH COUNT
AH = 2Eh
BX = flush count
Return: AX = status (0000h successful)
Desc: specify how many dirty sectors the cache should write after each flush
interval (see AH=25h"QUICKCACHE") when buffered writes are enabled
SeeAlso: AH=21h"QUICKCACHE",AH=25h"QUICKCACHE",AH=2Ch
--------c-132F-------------------------------
INT 13 - QUICKCACHE II v4.20 - FORCE IMMEDIATE INCREMENTAL FLUSH
AH = 2Fh
Return: AX = status (0000h successful)
Desc: immediately flush up to "flushcount" dirty sectors to disk as if the
flush interval had expired
SeeAlso: AH=21h"QUICKCACHE"
--------!---Section--------------------------