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This compilation is Copyright (c) 1989,1990,1991,1992,1993,1994,1995 Ralf Brown
--------l-2E---------------------------------
INT 2E U - DOS 2+ - PASS COMMAND TO COMMAND INTERPRETER FOR EXECUTION
DS:SI -> commandline to execute (see #1371)
Return: all registers except CS:IP destroyed
AX = status (4DOS v4.0)
0000h successful
FFFFh error before processing command (not enough memory, etc)
other error number returned by command
Notes: this call allows execution of arbitrary commands (including COMMAND.COM
internal commands) without loading another copy of COMMAND.COM
if COMMAND.COM is the user's command interpreter, the primary copy
executes the command; this allows the master environment to be
modified by issuing a "SET" command, but changes in the master
environment will not become effective until all programs descended
from the primary COMMAND.COM terminate
since COMMAND.COM processes the string as if typed from the keyboard,
the transient portion needs to be present, and the calling program
must ensure that sufficient memory to load the transient portion can
be allocated by DOS if necessary
results are unpredictable if invoked by a program run from a batch file
because this call is not reentrant and COMMAND.COM uses the same
internal variables when processing a batch file
hooked but ignored by 4DOS v3.0 COMMAND.COM replacement unless SHELL2E
has been loaded
the MS-DOS 5 Programmer's Reference calls this "Reload Transient"
Format of DOS commandline:
Offset Size Description (Table 1371)
00h BYTE length of command string, not counting trailing CR
01h var command string
N BYTE 0Dh (CR)
--------O-2E---------------------------------
INT 2E UP - Windows NT - NATIVE API
EAX = function number
EDX = address of parameter block
Return: ???
--------l-2E----BXE22E-----------------------
INT 2E - 4DOS v2.x-3.03 SHELL2E.COM - UNINSTALL
BX = E22Eh
DS:SI -> zero byte
Return: if successful, SHELL2E terminates itself with INT 21/AH=4Ch
----------2F---------------------------------
INT 2F - Multiplex - NOTES
AH = identifier of program which is to handle the interrupt
00h-7Fh reserved for DOS
B8h-BFh reserved for networks
C0h-FFh reserved for applications
AL is the function code
This is a general mechanism for verifying the presence of a TSR and
communicating with it. When searching for a free identifier code for AH
using the installation check (AL=00h), the calling program should set
BX/CX/DX to 0000h and must not depend on any registers other than CS:IP
and SS:SP to be valid on return, since numerous programs now use additional
registers on input and/or output for the installation check.
Notes: Since the multiplex chain is growing so long, and beginning to
experience multiplex number collisions, I am proposing an alternate
multiplex interrupt on INT 2D. If you decide to use the alternate
multiplex, please let me know.
DOS and some other programs return values in the flags register, so
any TSR which chains by calling the previous handler rather than
jumping to it should ensure that the returned flags are preserved
and passed back to the original caller
SeeAlso: INT 2D
--------t-2F---------------------------------
INT 2F - BMB Compuscience Canada Utilities Interface - INSTALLATION CHECK
AH = xx (dynamically assigned based upon a search for a multiplex
number which doesn't answer installed)
AL = 00h installation check
ES:DI = EBEBh:BEBEh
Return: AL = 00h not installed
01h not installed, not OK to install
FFh installed; if ES:DI was EBEBh:BEBEh on entry, ES:DI will point
to a string of the form 'MMMMPPPPPPPPvNNNN' where MMMM is a
short form of the manufacturer's name, PPPPPPPP is a product
name and NNNN is the product's version number
--------t-2F---------------------------------
INT 2F - Ross Wentworth's Turbo Pascal POPUP LIBRARY
AH = programmer-selected multiplex number
AL = function
00h installation check
Return: AL = FFh if installed
01h get TSR interrupt vectors
Return: DX:AX -> vector table (see #1372)
02h get TSR code segment
Return: AX = code segment for all interrupt handlers
03h call user exit routine and release TSR's memory
04h get signature string
Return: DX:AX -> counted string containing signature
05h get TSR's INT 2F handler
Return: DX:AX -> INT 2F handler
06h enable/disable TSR
BL = new state (00h disabled, 01h enabled)
07h activate TSR (popup if not disabled)
08h get hotkeys
BL = which hotkey (00h = hotkey 1, 01h = hotkey 2)
Return: AX = hotkey (AH = keyflags, AL = scancode)
09h set hotkey
BL = which hotkey (00h = hotkey 1, 01h = hotkey 2)
CX = new hotkey (CH = keyflags, CL = scancode)
0Ah-1Fh reserved
Index: installation check;Ross Wentworth POPUP library
Index: hotkeys;Ross Wentworth POPUP library
Format of POPUP vector table entry:
Offset Size Description (Table 1372)
00h BYTE vector number (00h = end of table)
01h DWORD original vector
05h WORD offset of interrupt handler in TSR's code segment
--------t-2F---------------------------------
INT 2F - CiriSOFT Spanish University of Valladolid TSR's Interface
AH = xx (dynamically assigned based upon a search for a multiplex
number from C0h to FFh which doesn't answer installed)
AL = 00h installation check
ES:DI = 1492h:1992h
Return: AL = 00h not installed
01h not installed, not OK to install
FFh installed; and if ES:DI was 1492h:1992h on entry, ES:DI will
point to author_name_ver table (see #1373)
AH = FFh
Note: this interface permits advanced communication with TSRs: it is possible
to make a generic uninstall utility, advanced TSR relocator programs
in order to fit fragmented memory areas, etc.
See also: INT 2D"AMIS",INT 2F"Compuscience"
Index: installation check;CiriSOFT TSR interface
Index: uninstall;CiriSOFT TSR interface
Format of CiriSOFT author_name_ver table:
Offset Size Description (Table 1373)
-16 WORD segment of the start of the resident TSR code (CS in programs
with PSP, XMS upper memory segment if installed as UMB...)
-14 WORD offset of the start of the resident TSR code (frequently 100h
in *.COM programs and 0 in upper memory TSR's).
-12 WORD memory used by TSR (in paragraphs). Knowing the memory area
used by TSR is possible to determine if hooked vectors are
still pointing it (and if it is safe to uninstall).
-10 BYTE characteristics byte (see #1374)
-9 BYTE number of multiplex entry used (redefinition available). Note
that the TSR must use THIS variable in it's INT 2Fh handler.
-8 WORD offset to vector_area table (see #1375)
-6 WORD offset to extra_area table (see #1376,bit 7 in offset -10)
-4 4 BYTEs signature string "*##*"
00h var "AUTHOR:PROGRAM_NAME:VERSION",0 (variable length, this area
is used in order to determine if the TSR is already resident
and it's version code; the ':' char is used as delimiter)
Bitfields for CiriSOFT characteristics byte:
Bit(s) Description (Table 1374)
0-2 type
000 normal program (with PSP)
001 upper XMS memory block (needed HIMEM.SYS function to free memory
when uninstalling)
010 device driver (*.SYS)
011 device driver in EXE format
1xx others (reserved)
3-6 reserved
7 set if extra_table defined and supported (see #1376)
SeeAlso: #1373
Format of CiriSOFT vector_area table:
Offset Size Description (Table 1375)
-1 BYTE number of vectors intercepted by TSR
00h BYTE first vector number
01h DWORD first vector pointer before installing the TSR
05h BYTE second vector number
06h DWORD second vector pointer before installing the TSR
0Ah ... (and so on)
Note: the TSR must use these variables to invoke the previous interrupt
handler routines
SeeAlso: #1373
Format of extra_area table (needed only to improve relocation feature):
Offset Size Description (Table 1376)
00h WORD offset to external_ctrl table (see #1377)
0000h if not supported
02h WORD reserved for future use (0)
SeeAlso: #1373
Format of CiriSOFT external_ctrl table:
Offset Size Description (Table 1377)
00h BYTE bit 0: TSR is relocatable (no absolute segment references)
01h WORD offset to a variable which can activate/inhibit the TSR
---And if bit 0 in offset 00h is off:
03h DWORD pointer to ASCIZ pathname for executable file which supports
/SR parameter (silent installation & inhibit)
07h DWORD pointer to first variable to initialize on the copy reloaded
from the previous TSR still resident
0Bh DWORD pointer to last variable (all variables packed in one block)
--------c-2F00-------------------------------
INT 2F U - DOS 2.x only PRINT.COM - ???
AH = 00h
???
Return: ???
Notes: DOS 2.x PRINT.COM does not chain to previous INT 2F handler
values in AH other than 00h or 01h cause PRINT to return the number of
files in the queue in AH
SeeAlso: AH=01h
--------P-2F00-------------------------------
INT 2F U - PSPRINT - PRINT JOB CONTROL
AH = 00h
???
Return: ???
--------c-2F0080-----------------------------
INT 2F - DOS 3.1+ PRINT - GIVE PRINT A TIME SLICE
AX = 0080h
Return: after PRINT executes
Notes: PRINT returns AL=01h if AH=00h but AL is not 80h on entry
this function is not supported by the Novell DOS 7 PRINT.COM
--------N-2F00D8-----------------------------
INT 2F - Personal NetWare - VLM - ???
AX = 00D8h
???
Return: ???
Note: hooked by one of the .VLMs loaded by VLM.EXE v1.10, but apparently a
NOP
--------c-2F01-------------------------------
INT 2F U - DOS 2.x only PRINT.COM - ???
AH = 01h
???
Return: ???
Notes: DOS 2.x PRINT.COM does not chain to previous INT 2F handler
values in AH other than 00h or 01h cause PRINT to return the number of
files in the queue in AH
SeeAlso: AH=00h
--------c-2F0100-----------------------------
INT 2F - DOS 3+ PRINT - INSTALLATION CHECK
AX = 0100h
Return: AL = status
00h not installed
01h not installed, but not OK to install
FFh installed
AH = 00h (Novell DOS 7)
SeeAlso: AX=0101h
--------c-2F0100SI20D6-----------------------
INT 2F U - PrintCache 3.1 PRINT.COM - INSTALLATION CHECK
AX = 0100h
SI = 20D6h
DI = 8761h
Return: AX = 00FFh if installed
DI = 0001h if PrintCache's PRINT.COM installed and magic values match
SI = resident code segment
Program: PrintCache PRINT.COM is a DOS PRINT replacement included in
LaserTools' PrintCache memory/disk-based print spooler package
Note: if either of SI or DI differ from the indicated magic values, only AX
will be modified on return, for compatibility with DOS PRINT
SeeAlso: AX=0101h/SI=20D6h,AX=C000h"PCACHE"
--------c-2F0101-----------------------------
INT 2F - DOS 3+ PRINT - SUBMIT FILE FOR PRINTING
AX = 0101h
DS:DX -> submit packet (see #1378)
Return: CF clear if successful
AL = status
01h added to queue
9Eh now printing
CF set on error
AX = error code (see #1379,#0885 at INT 21/AH=59h)
SeeAlso: AX=0102h
Format of PRINT submit packet:
Offset Size Description (Table 1378)
00h BYTE level (must be 00h)
01h DWORD pointer to ASCIZ filename (no wildcards)
(Table 1379)
Values for PRINT error code:
0001h invalid function
0002h file not found
0003h path not found
0004h out of file handles
0005h access denied
0008h print queue full
0009h spooler busy
000Ch name too long
000Fh invalid drive
--------c-2F0101SI20D6-----------------------
INT 2F U - PrintCache v3.1 PRINT.COM - SUBMIT FILE FOR PRINTING
AX = 0101h
SI = 20D6h
DI = 8761h
DS:DX -> submit packet (see #1378)
CL = print options
bit 4: use default options
Return: CF clear if successful
AL = status
01h added to queue
9Eh now printing
CF set on error
AX = error code (see #1379)
Program: PrintCache PRINT.COM is a DOS PRINT replacement included in
LaserTools' PrintCache memory/disk-based print spooler package
Note: if either SI or DI differs from the indicated magic values on entry,
PrintCache will use the default print options for the file for
compatibility with DOS PRINT
SeeAlso: AX=0100h/SI=20D6h,AX=0101h,AX=0107h"PrintCache"
--------c-2F0102-----------------------------
INT 2F - DOS 3+ PRINT - REMOVE FILE FROM PRINT QUEUE
AX = 0102h
DS:DX -> ASCIZ filename (wildcards allowed)
Return: CF clear if successful
CF set on error
AX = error code (see #1379)
SeeAlso: AX=0101h,AX=0103h
--------c-2F0103-----------------------------
INT 2F - DOS 3+ PRINT - CANCEL ALL FILES IN PRINT QUEUE
AX = 0103h
Return: CF clear if successful
CF set on error
AX = error code (see #1379)
SeeAlso: AX=0102h
--------c-2F0104-----------------------------
INT 2F - DOS 3+ PRINT - FREEZE PRINT QUEUE TO READ JOB STATUS
AX = 0104h
Return: CF clear if successful
DX = error count since status last read
DS:SI -> print queue
CF set on error
AX = error code (see #1379)
Desc: get the list of print jobs, temporarily suspending PRINT's activities
to avoid changing the list while it is being examined
Notes: the print queue is an array of 64-byte ASCIZ filenames terminated by
an empty filename; the first name is the file currently being printed
printing is stopped until AX=0105h is called to prevent the queue
from changing while the filenames are being read
SeeAlso: AX=0101h,AX=0105h
--------c-2F0105-----------------------------
INT 2F - DOS 3+ PRINT - RESTART PRINT QUEUE AFTER STATUS READ
AX = 0105h
Return: CF clear if successful
CF set on error
AX = error code (see #1379)
Desc: restart PRINT's activities once an application finishes examining the
print queue
SeeAlso: AX=0104h
--------c-2F0106-----------------------------
INT 2F - DOS 3.3+ PRINT - GET PRINTER DEVICE
AX = 0106h
Return: CF set if files in print queue
AX = error code 0008h (queue full)
DS:SI -> device driver header
CF clear if print queue empty
AX = 0000h
Desc: determine which device, if any, PRINT is currently using for output
Notes: undocumented prior to the release of MS-DOS 5.0
this function can be used to allow a program to avoid printing to the
printer on which PRINT is currently performing output
SeeAlso: AX=0104h
--------c-2F0107-----------------------------
INT 2F U - PrintCache v3.1 PRINT.COM - SET TRAILING FORM FEEDS
AX = 0107h
CL bit 0: output form feed between print jobs
Return: AL destroyed
SeeAlso: AX=0100h/SI=20D6h,AX=0101h/SI=20D6h
--------N-2F0200-----------------------------
INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - INSTALLATION CHECK
AX = 0200h
Return: AL = FFh if installed
Desc: determine whether the PC LAN Program redirector is installed
SeeAlso: AX=0201h,AX=0203h
--------N-2F0201-----------------------------
INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - ???
AX = 0201h
Return: nothing???
Notes: this function is called by the DOS 3.3+ PRINT.COM
AX=0202h appears to be the opposite function
these functions are supposedly used to signal opening and closing of
printers
SeeAlso: AX=0202h
--------N-2F0202-----------------------------
INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - ???
AX = 0202h
???
Return: nothing???
Notes: this function is called by the DOS 3.3+ PRINT.COM
these functions are supposedly used to signal opening and closing of
printers
SeeAlso: AX=0201h
--------N-2F0203-----------------------------
INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - ???
AX = 0203h
Return: nothing???
Notes: this function is called by the DOS 3.3+ PRINT.COM
AX=0204h appears to be the opposite function
these functions are supposedly used to signal opening and closing of
printers
SeeAlso: AX=0200h,AX=0204h
--------N-2F0204-----------------------------
INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - ???
AX = 0204h
???
Return: nothing???
Notes: this function is called by the DOS 3.3+ PRINT.COM
AX=0203h appears to be the opposite function
these functions are supposedly used to signal opening and closing of
printers
SeeAlso: AX=0200h,AX=0203h
--------N-2F---------------------------------
INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - ???
AX = 02xxh
???
Return: ???
--------l-2F0500-----------------------------
INT 2F U - DOS 3+ CRITICAL ERROR HANDLER - INSTALLATION CHECK
AX = 0500h
Return: AL = 00h not installed, OK to install
01h not installed, can't install
FFh installed
Desc: determine whether a critical error message override is installed
Note: this set of functions allows a user program to partially or completely
override the default critical error handler's message in COMMAND.COM
SeeAlso: AH=05h,INT 24
--------l-2F05-------------------------------
INT 2F CU - DOS 3+ CRITICAL ERROR HANDLER - EXPAND ERROR INTO STRING
AH = 05h
---DOS 3.x---
AL = extended error code (not zero)
---DOS 4+ ---
AL = error type
01h DOS extended error code
02h parameter error
BX = error code
Return: CF clear if successful
ES:DI -> ASCIZ error message (read-only)
AL = completion state
00h message requires completion with device name, drive, etc.
01h message is complete as returned
CF set if error code can't be converted to string
AX,DI,ES destroyed
other flags corrupted
Notes: called at start of COMMAND.COM's default critical error handler if
installed by a user program, allowing partial or complete overriding
of the default error messages
subfunction 02h is called by many DOS 4 external programs
DR-DOS's COMMAND.COM appends additional info ("0 files copied") to the
returned string
SeeAlso: AX=0500h,AX=122Eh,INT 24
--------U-2F0600-----------------------------
INT 2F - DOS 3+ ASSIGN - INSTALLATION CHECK
AX = 0600h
Return: AL = status
00h not installed
01h not installed, but not OK to install
FFh installed
Notes: ASSIGN is not a TSR in DR-DOS 5.0; it is internally replaced by SUBST
(see INT 21/AH=52h)
undocumented prior to the release of DOS 5.0
SeeAlso: AX=0601h,INT 21/AH=52h
--------U-2F0601-----------------------------
INT 2F U - DOS 3+ ASSIGN - GET DRIVE ASSIGNMENT TABLE
AX = 0601h
Return: ES = segment of ASSIGN work area and assignment table
Note: under DOS 3+, the 26 bytes starting at ES:0103h specify which drive
each of A: to Z: is mapped to. Initially set to 01h 02h 03h....
SeeAlso: AX=0600h
--------D-2F0800-----------------------------
INT 2F U - DRIVER.SYS support - INSTALLATION CHECK
AX = 0800h
Return: AL = status
00h not installed, OK to install
01h not installed, not OK to install
FFh installed
Desc: determine whether the internal support code used by DRIVER.SYS is
present; it is always present in DOS 3.2+
Note: supported by DR-DOS 5.0
--------D-2F0801-----------------------------
INT 2F U - DRIVER.SYS support - ADD NEW BLOCK DEVICE
AX = 0801h
DS:DI -> drive data table (see #1386,#1387,#1388)
Return: AX,BX,SI,ES destroyed
Notes: moves down internal list of drive data tables, copying and modifying
the drive description flags word for tables referencing same physical
drive
the data table is appended to the chain of tables
supported by DR-DOS 5.0
SeeAlso: AX=0803h
--------D-2F0802-----------------------------
INT 2F U - DRIVER.SYS support - EXECUTE DEVICE DRIVER REQUEST
AX = 0802h
ES:BX -> device driver request header (see #1382)
Return: request header updated as per requested operation
Notes: supported by DR-DOS 5.0
DOS 3.2 executes this function on any AL value from 02h through F7h;
DOS 4+ executes this function on AL=02h and AL=04h-F7h
the command codes (see #1380) and structures described below apply
to all drivers which support the appropriate commands; this call is
just one of a number of ways in which a device driver request may
be invoked
this call reportedly leaves one word on the stack under MS-DOS 6.2,
so the stack pointer should be saved and restored around the call
to this function
SeeAlso: AX=0800h,AX=0801h,AX=0803h,INT 21/AH=52h,INT 21/AH=99h,INT 21/AH=9Ah
(Table 1380)
Values for device driver command code:
00h INIT
01h MEDIA CHECK (block devices)
02h BUILD BPB (block devices)
03h IOCTL INPUT
04h INPUT
05h NONDESTRUCTIVE INPUT, NO WAIT (character devices)
06h INPUT STATUS (character devices)
07h INPUT FLUSH (character devices)
08h OUTPUT
09h OUTPUT WITH VERIFY
0Ah OUTPUT STATUS (character devices)
0Bh OUTPUT FLUSH (character devices)
0Ch IOCTL OUTPUT
0Dh (DOS 3+) DEVICE OPEN
0Eh (DOS 3+) DEVICE CLOSE
0Fh (DOS 3+) REMOVABLE MEDIA (block devices)
10h (DOS 3+) OUTPUT UNTIL BUSY (character devices)
11h (European MS-DOS 4.0) STOP OUTPUT (console screen drivers only)
12h (European MS-DOS 4.0) RESTART OUTPUT (console screen drivers only)
13h (DOS 3.2+) GENERIC IOCTL
14h unused
15h (European MS-DOS 4.0) RESET UNCERTAIN MEDIA FLAG
16h unused
17h (DOS 3.2+) GET LOGICAL DEVICE
18h (DOS 3.2+) SET LOGICAL DEVICE
19h (DOS 5+) CHECK GENERIC IOCTL SUPPORT
80h (CD-ROM) READ LONG
81h (CD-ROM) reserved
82h (CD-ROM) READ LONG PREFETCH
83h (CD-ROM) SEEK
84h (CD-ROM) PLAY AUDIO
85h (CD-ROM) STOP AUDIO
86h (CD-ROM) WRITE LONG
87h (CD-ROM) WRITE LONG VERIFY
88h (CD-ROM) RESUME AUDIO
Bitfields for device request status:
Bit(s) Description (Table 1381)
15 error
14-11 reserved
10 ??? set by DOS kernel on entry to some driver calls
9 busy
8 done (may be clear on return under European MS-DOS 4.0)
7-0 error code if bit 15 set (see #1383)
Format of device driver request header:
Offset Size Description (Table 1382)
00h BYTE length of request header
01h BYTE subunit within device driver
02h BYTE command code (see #1380)
03h WORD status (filled in by device driver) (see #1381)
---DOS---
05h 4 BYTEs reserved (unused in DOS 2.x and 3.x)
09h DWORD (European MS-DOS 4.0 only) pointer to next request header in
device's request queue
(other versions) reserved (unused in DOS 2.x and 3.x)
---STARLITE architecture---
05h DWORD pointer to next request header
09h 4 BYTEs reserved
---command code 00h---
0Dh BYTE (ret) number of units
0Eh DWORD (call) pointer to DOS device helper function (see #1384)
(European MS-DOS 4.0 only)
(call) pointer past end of memory available to driver (DOS 5+)
(ret) address of first free byte following driver
12h DWORD (call) pointer to commandline arguments
(ret) pointer to BPB array (block drivers) or
0000h:0000h (character drivers)
16h BYTE (DOS 3+) drive number for first unit of block driver (0=A)
---European MS-DOS 4.0---
17h DWORD pointer to function to save registers on stack
---DOS 5+ ---
17h WORD (ret) error-message flag
0001h MS-DOS should display error msg on init failure
---command code 01h---
0Dh BYTE media descriptor
0Eh BYTE (ret) media status
00h don't know
01h media has not changed
FFh media has been changed
0Fh DWORD (return, DOS 3+) pointer to previous volume ID if OPEN/CLOSE/RM
bit in device header is set and disk changed
---command code 02h---
0Dh BYTE media descriptor
0Eh DWORD transfer address
-> scratch sector if NON-IBM FORMAT bit in device header set
-> first FAT sector otherwise
12h DWORD pointer to BPB (set by driver) (see #0875 at INT 21/AH=53h)
---command codes 03h,0Ch--- (see also INT 21/AX=4402h,INT 21/AX=4403h)
0Dh BYTE media descriptor (block devices only)
0Eh DWORD transfer address
12h WORD (call) number of bytes to read/write
(ret) actual number of bytes read or written
---command codes 04h,08h,09h (except Compaq DOS 3.31, DR-DOS 6)---
0Dh BYTE media descriptor (block devices only)
0Eh DWORD transfer address
12h WORD byte count (character devices) or sector count (block devices)
14h WORD starting sector number (block devices only)
16h DWORD (DOS 3+) pointer to volume ID if error 0Fh returned
1Ah DWORD (DOS 4+) 32-bit starting sector number (block devices with
device attribute word bit 1 set only) if starting sector
number above is FFFFh (see INT 21/AH=52h)
---command codes 04h,08h,09h (Compaq DOS 3.31, DR-DOS 6)---
0Dh BYTE media descriptor (block devices only)
0Eh DWORD transfer address
12h WORD byte count (character devices) or sector count (block devices)
14h DWORD 32-bit starting sector number (block devices only)
Note: to reliably determine which variant of the request block for
functions 04h,08h,09h has been passed to the driver, check
the length field as well as the word at offset 14h. If the
length is 1Eh and 14h=FFFFh, use the DWORD at 1Ah as the
starting sector number; if the length is 18h, use the DWORD
at 14h; otherwise, use the WORD at 14h.
---command code 05h---
0Dh BYTE byte read from device if BUSY bit clear on return
---command codes 06h,07h,0Ah,0Bh,0Dh,0Eh,0Fh---
no further fields
---command code 10h---
0Dh BYTE unused
0Eh DWORD transfer address
12h WORD (call) number of bytes to write
(ret) actual number of bytes written
---command codes 11h,12h---
0Dh BYTE reserved
---command code 15h---
no further fields
---command codes 13h,19h---
0Dh BYTE category code
00h unknown
01h COMn:
03h CON
05h LPTn:
07h mouse (European MS-DOS 4.0)
08h disk
9Eh (STARLITE) Media Access Control driver
0Eh BYTE function code
00h (STARLITE) MAC Bind request
0Fh WORD copy of DS at time of IOCTL call (apparently unused in DOS 3.3)
SI contents (European MS-DOS 4.0)
11h WORD offset of device driver header
DI contents (European MS-DOS 4.0)
13h DWORD pointer to parameter block from INT 21/AX=440Ch or AX=440Dh
---command codes 80h,82h---
0Dh BYTE addressing mode
00h HSG (default)
01h Phillips/Sony Red Book
0Eh DWORD transfer address (ignored for command 82h)
12h WORD number of sectors to read
(if 0 for command 82h, request is an advisory seek)
14h DWORD starting sector number
logical sector number in HSG mode
frame/second/minute/unused in Red Book mode
(HSG sector = minute * 4500 + second * 75 + frame - 150)
18h BYTE data read mode
00h cooked (2048 bytes per frame)
01h raw (2352 bytes per frame, including EDC/ECC)
19h BYTE interleave size (number of sectors stored consecutively)
1Ah BYTE interleave skip factor
(number of sectors between consecutive portions)
---command code 83h---
0Dh BYTE addressing mode (see above)
0Eh DWORD transfer address (ignored)
12h WORD number of sectors to read (ignored)
14h DWORD starting sector number (see also above)
---command code 84h---
0Dh BYTE addressing mode (see above)
0Eh DWORD starting sector number (see also above)
12h DWORD number of sectors to play
---command codes 85h,88h---
no further fields
---command codes 86h,87h---
0Dh BYTE addressing mode (see above)
0Eh DWORD transfer address (ignored in write mode 0)
12h WORD number of sectors to write
14h DWORD starting sector number (see also above)
18h BYTE write mode
00h mode 0 (write all zeros)
01h mode 1 (default) (2048 bytes per sector)
02h mode 2 form 1 (2048 bytes per sector)
03h mode 2 form 2 (2336 bytes per sector)
19h BYTE interleave size (number of sectors stored consecutively)
1Ah BYTE interleave skip factor
(number of sectors between consecutive portions)
(Table 1383)
Values for device driver error code:
00h write-protect violation
01h unknown unit
02h drive not ready
03h unknown command
04h CRC error
05h bad drive request structure length
06h seek error
07h unknown media
08h sector not found
09h printer out of paper
0Ah write fault
0Bh read fault
0Ch general failure
0Dh reserved
0Eh (CD-ROM) media unavailable
0Fh invalid disk change
(Table 1384)
Call European MS-DOS 4.0 device helper function with:
DL = function
00h "SchedClock" called on each timer tick
AL = tick interval in milliseconds
01h "DevDone" device I/O complete
ES:BX -> request header
Note: must update status word first; may be called from
an interrupt handler
02h "PullRequest" pull next request from queue
DS:SI -> DWORD pointer to start of device's request queue
Return: ZF clear if pending request
ES:BX -> request header
ZF set if no more requests
03h "PullParticular" remove specific request from queue
DS:SI -> DWORD pointer to start of device's request queue
ES:BX -> request header
Return: ZF set if request header not found
04h "PushRequest" push the request onto the queue
DS:SI -> DWORD pointer to start of device's request queue
ES:BX -> request header
interrupts disabled
05h "ConsInputFilter" keyboard input check
AX = character (high byte 00h if PC ASCII character)
Return: ZF set if character should be discarded
ZF clear if character should be handled normally
Note: called by keyboard interrupt handler so DOS can scan
for special input characters
06h "SortRequest" push request in sorted order by starting sector
DS:SI -> DWORD pointer to start of device's request queue
ES:BX -> request header
interrupts disabled
07h "SigEvent" send signal on keyboard event
AH = event identifier
Return: AL,FLAGS destroyed
09h "ProcBlock" block on event
AX:BX = event identifier (typically a pointer)
CX = timeout in ms or 0000h for never
DH = interruptable flag (nonzero if pause may be interrupted)
interrupts disabled
Return: after corresponding ProcRun call
CF clear if event wakeup, set if unusual wakeup
ZF set if timeout wakeup, clear if interrupted
AL = wakeup code, nonzero if unusual wakeup
interrupts enabled
BX,CX,DX destroyed
Note: block process and schedules another to run
0Ah "ProcRun" unblock process
AX:BX = event identifier (typically a pointer)
Return: AX = number of processes awakened
ZF set if no processes awakened
BX,CX,DX destroyed
0Bh "QueueInit" initialize/clear character queue
DS:BX -> character queue structure (see #1385)
Note: the queue size field must be set before calling
0Dh "QueueWrite" put a character in the queue
DS:BX -> character queue (see #1385)
AL = character to append to end of queue
Return: ZF set if queue is full
ZF clear if character stored
0Eh "QueueRead" get a character from the queue
DS:BX -> character queue (see #1385)
Return: ZF set if queue is empty
ZF clear if characters in queue
AL = first character in queue
10h "GetDOSVar" return pointer to DOS variable
AL = index of variable
03h current process ID
BX = index into variable if AL specifies an array
CX = expected length of variable
Return: CF clear if successful
DX:AX -> variable
CF set on error
AX,DX destroyed
BX,CX destroyed
Note: the variables may not be modified
14h "Yield" yield CPU if higher-priority task ready to run
Return: FLAGS destroyed
1Bh "CritEnter" begin system critical section
DS:BX -> semaphore (6 BYTEs, initialized to zero)
Return: AX,BX,CX,DX destroyed
1Ch "CritLeave" end system critical section
DS:BX -> semaphore (6 BYTEs, initialized to zero)
Return: AX,BX,CX,DX destroyed
Note: must be called in the context of the process which
called CritEnter on the semaphore
Note: the DWORD pointing at the request queue must be allocated by the driver
and initialized to 0000h:0000h. It always points at the next request
to be executed
Format of European MS-DOS 4.0 character queue:
Offset Size Description (Table 1385)
00h WORD size of queue in bytes
02h WORD index of next character out
04h WORD count of characters in the queue
06h N BYTEs queue buffer
--------D-2F0803-----------------------------
INT 2F U - DOS 4+ DRIVER.SYS support - GET DRIVE DATA TABLE LIST
AX = 0803h
Return: DS:DI -> first drive data table in list (see #1386,#1387,#1388)
Note: not available under DR-DOS 5.0
SeeAlso: AX=0801h
Format of DOS 3.30 drive data table:
Offset Size Description (Table 1386)
00h DWORD pointer to next table (offset FFFFh if last table)
04h BYTE physical unit number (for INT 13)
05h BYTE logical drive number (0=A:)
06h 19 BYTEs BIOS Parameter Block (see also INT 21/AH=53h)
Offset Size Description
00h WORD bytes per sector
02h BYTE sectors per cluster, FFh if unknown
03h WORD number of reserved sectors
05h BYTE number of FATs
06h WORD number of root dir entries
08h WORD total sectors
0Ah BYTE media descriptor, 00h if unknown
0Bh WORD sectors per FAT
0Dh WORD sectors per track
0Fh WORD number of heads
11h WORD number of hidden sectors
19h BYTE flags
bit 6: 16-bit FAT instead of 12-bit FAT
1Ah WORD number of DEVICE OPEN calls without corresponding DEVICE CLOSE
1Ch 11 BYTEs volume label or "NO NAME " if none (always "NO NAME" for
fixed media)
27h BYTE terminating null for volume label???
28h BYTE device type (see #0781 at INT 21/AX=440Dh)
29h WORD bit flags describing drive (see #1389)
2Bh WORD number of cylinders
2Dh 19 BYTEs BIOS Parameter Block for highest capacity supported
40h 3 BYTEs ???
43h 9 BYTEs filesystem type???, default = "NO NAME "
(apparently only MS-DOS 3.30 fixed media, nulls for removable
media and PC-DOS 3.30)
4Ch BYTE least-significant byte of last-accessed cylinder number
---removable media---
4Dh DWORD time of last access in clock ticks (FFFFFFFFh if never)
---fixed media---
4Dh WORD partition (FFFFh = primary, 0001h = extended)
4Fh WORD absolute cylinder number of partition's start on physical
drive (always FFFFh if primary partition)
SeeAlso: #1387,#1388
Format of COMPAQ DOS 3.31 drive data table:
Offset Size Description (Table 1387)
00h DWORD pointer to next table (offset FFFFh if last table)
04h BYTE physical unit number (for INT 13)
05h BYTE logical drive number (0=A:)
06h 25 BYTEs BIOS Parameter Block (see DOS 4.0-6.0 drive data table below)
1Fh 6 BYTEs reserved fields from BPB above???
25h BYTE flags
bit 6: 16-bit FAT instead of 12-bit FAT
bit 5: large volume???
26h WORD device-open count???
28h 11 BYTEs volume label or "NO NAME " if none (always "NO NAME" for
fixed media)
33h BYTE terminating null for volume label
34h BYTE device type (see #0781 at INT 21/AX=440Dh)
35h WORD bit flags describing drive (see #1389)
37h WORD number of cylinders
39h 25 BYTEs BIOS parameter block for highest capacity drive supports
52h 6 BYTEs ??? apparently always zeros
58h BYTE least-significant byte of last-accessed cylinder number
---removable media---
59h DWORD time of last access in clock ticks (FFFFFFFFh if never)
---fixed media---
59h WORD partition (FFFFh = primary, 0001h = extended)
5Bh WORD absolute cylinder number of partition's start on physical
drive (always FFFFh if primary partition)
SeeAlso: #1386,#1388
Format of DOS 4.0-6.0 drive data table:
Offset Size Description (Table 1388)
00h DWORD pointer to next table (offset FFFFh if last table)
04h BYTE physical unit number (for INT 13)
05h BYTE logical drive number (0=A:)
06h 25 BYTEs BIOS Parameter Block (see also INT 21/AH=53h)
Offset Size Description
00h WORD bytes per sector
02h BYTE sectors per cluster, FFh if unknown
03h WORD number of reserved sectors
05h BYTE number of FATs
06h WORD number of root dir entries
08h WORD total sectors (see offset 15h if zero)
0Ah BYTE media descriptor, 00h if unknown
0Bh WORD sectors per FAT
0Dh WORD sectors per track
0Fh WORD number of heads
11h DWORD number of hidden sectors
15h DWORD total sectors if WORD at 08h is zero
1Fh BYTE flags
bit 6: 16-bit FAT instead of 12-bit
bit 7: unsupportable disk (all accesses will return Not Ready)
20h WORD device-open count
22h BYTE device type (see #0781 at INT 21/AX=440Dh)
23h WORD bit flags describing drive (see #1389)
25h WORD number of cylinders (for partition only, if hard disk)
27h 25 BYTEs BIOS Parameter Block for default (highest) capacity supported
40h 6 BYTEs reserved (part of BPB above)
46h BYTE last track accessed
---removable media---
47h DWORD time of last access in clock ticks (FFFFFFFFh if never)
---fixed media---
47h WORD partition (FFFFh = primary, 0001h = extended)
always 0001h for DOS 5+
49h WORD absolute cylinder number of partition's start on physical drive
(FFFFh if primary partition in DOS 4.x)
------
4Bh 11 BYTEs volume label or "NO NAME " if none (apparently taken from
extended boot record rather than root directory)
56h BYTE terminating null for volume label
57h DWORD serial number
5Bh 8 BYTEs filesystem type ("FAT12 " or "FAT16 ")
63h BYTE terminating null for filesystem type
SeeAlso: #1386,#1387
Bitfields for flags describing drive:
Bit(s) Description (Table 1389)
0 fixed media
1 door lock ("changeline") supported
2 current BPB locked
3 all sectors in a track are the same size
4 physical drive has multiple logical units
5 current logical drive for shared physical drive
6 disk change detected
7 device parameters were changed (set DASD before formatting)
(see #0780 at INT 21/AX=440Dh)
8 disk reformatted (BPB of current media was changed)
9 access flag (fixed media only, disables reads and writes)
(see #0786 at INT 21/AX=440Dh)
--------f-2F1000-----------------------------
INT 2F - SHARE - INSTALLATION CHECK
AX = 1000h
Return: AL = status
00h not installed, OK to install
01h not installed, not OK to install
FFh installed
BUGS: values of AL other than 00h put DOS 3.x SHARE into an infinite loop
(08E9: OR AL,AL
08EB: JNZ 08EB) <- the buggy instruction (DOS 3.3)
values of AL other than described here put PC-DOS 4.00 into the same
loop (the buggy instructions are the same)
Notes: supported by OS/2 v1.3+ compatibility box, which always returns AL=FFh
if DOS 4.01 SHARE was automatically loaded, file sharing is in an
inactive state (due to the undocumented /NC flag used by the autoload
code) until this call is made
DOS 5+ chains to the previous handler if AL <> 00h on entry
Windows Enhanced mode hooks this call and reports that SHARE is
installed even when it is not
SeeAlso: AX=1080h,INT 21/AH=52h
--------d-2F1001-----------------------------
INT 2F U - DR-DOS 6.0 SHARE internal - SET ???
AX = 1001h
DX:BX -> ???function
Notes: this function is also supported by SuperStor, a disk-compression
program by Addstor which is bundled with DR-DOS 6.0, and the
Novell DOS 7 DELWATCH.EXE
the default handler for the pointer set by this call under DELWATCH
simply returns with CF set
SeeAlso: AX=1000h,AX=F800h
--------f-2F1040-----------------------------
INT 2F U - DOS 4 only SHARE internal - ???
AX = 1040h
???
Return: AL = FFh???
SeeAlso: AX=1000h
--------f-2F1080-----------------------------
INT 2F U - DOS 4 only SHARE internal - TURN ON FILE SHARING CHECKS
AX = 1080h
Return: AL = status
F0h successful
FFh checking was already on
Note: DOS 4.x SHARE has dual functions: FCB support for large (>32M) media
and file sharing checks. The undocumented commandline flag /NC can
be used to disable the sharing code.
SeeAlso: AX=1000h,AX=1081h
--------f-2F1081-----------------------------
INT 2F U - DOS 4 only SHARE internal - TURN OFF FILE SHARING CHECKS
AX = 1081h
Return: AL = status
F0h successful
FFh checking was already off
Note: (see AX=1080h)
SeeAlso: AX=1000h,AX=1080h
----------2F10FE-----------------------------
INT 2F U - Novell DOS 7 DELWATCH.EXE - INSTALLATION CHECK
AX = 10FEh
Return: AX = 20FFh if installed and active
DX:BX -> private entry point (see #1390)
(Table 1390)
Call DELWATCH private entry point with:
AH = function
00h NOP???
Return: AX = 0000h
CX = 0004h (unsupported function)
01h disable DELWATCH on drive
AL = drive number (00h = A:)
Return: AX = status (0000h if failed, FFFFh if successful)
02h ???
AL = drive number (00h = A:)
???
Return: ???
03h ???
AL = drive number (00h = A:)
CX = ??? (0000h/0001h)
???
Return: ???
04h ???
AL = drive number (00h = A:)
???
Return: ???
05h ???
AL = drive number (00h = A:)
???
Return: ???
06h enable DELWATCH on drive
AL = drive number with bit 7 set (80h = A:, etc.)
BX = maximum files of same name in one directory to save
CX = maximum files to save on this disk
???
Return: AX = status
0000h failed
FFFFh successful
CX = error code on failure
(0004h if AL < 80h on entry)
07h ???
08h set file extensions list
AL = sense (00h exclude named extensions, 01h only named ext.)
DS:BX -> 31-byte ASCIZ extension list (three blank-padded bytes
per extension)
Return: AX = FFFFh (successful)
09h ???
AL = drive number (00h = A:)
???
Return: ???
0Ah ???
AL = drive number (00h = A:)
???
Return: ???
0Bh reset ???
Return: AX = FFFFh (successful)
see also function 0Dh
0Ch check if drive enabled
AL = drive number with bit 7 set (80h = A:, etc.)
Return: AX = state
0000h disabled or error (check CX)
0001h drive enabled
CX = error code (0004h invalid drive number)
0Dh set ???
BX = ???
Return: AX = FFFFh (successful)
see also function 0Bh
0Eh ???
AL = drive number (00h = A:)
???
Return: ???
Return: AX = 0000h, CX = 0001h if DELWATCH busy
registers unchanged if AH >= 0Fh on entry
--------O-2F10FF-----------------------------
INT 2F U - Multiplex - DR-DOS 5.0 - ???
AX = 10FFh
ES:BX -> ???
Note: sets pointer in kernel
--------N-2F1100-----------------------------
INT 2F C - NETWORK REDIRECTOR - INSTALLATION CHECK
AX = 1100h
Return: AL = status
00h not installed, OK to install
01h not installed, not OK to install
FFh installed
AH = product identifier (ad hoc by various manufacturers)
00h if PC Tools v8 DRIVEMAP
42h ('B') for Beame&Whiteside BWNFS v3.0a
6Eh ('n') for NetWare Lite v1.1 CLIENT
Notes: this function is called by the DOS 3.1+ kernel
in DOS 4.x only, the 11xx calls are all in IFSFUNC.EXE, not in the
PC LAN Program redirector; DOS 5+ moves the calls back into the
redirector
the PC Network 1.00 redirector (renamed to PC LAN Program in 1.1-1.3)
only supports AL=00h-27h
--------d-2F1100SFDADA-----------------------
INT 2F - MSCDEX (MS CD-ROM Extensions) - INSTALLATION CHECK
AX = 1100h subfn DADAh
STACK: WORD DADAh
Return: AL = status
00h not installed, OK to install
STACK unchanged
01h not installed, not OK to install
STACK unchanged
FFh installed
STACK: WORD ADADh if MSCDEX installed
DADBh if Lotus CD/Networker installed
Note: although MSCDEX sets the stack word to ADADh on return, any value other
than DADAh is considered to mean that MSCDEX is already installed;
Lotus CD/Networker v4+ uses this feature to fool MSCDEX into
thinking it is already installed when it is in fact CD/Networker
that is installed
Index: installation check;Lotus CD/Networker
Index: Lotus CD/Networker;installation check
--------N-2F1101-----------------------------
INT 2F CU - NETWORK REDIRECTOR - REMOVE REMOTE DIRECTORY
AX = 1101h
SS = DOS DS
SDA first filename pointer -> fully-qualified directory name
SDA CDS pointer -> current directory structure for drive with dir
Return: CF set on error
AX = DOS error code (see #0885 at INT 21/AH=59h)
CF clear if successful
Note: this function is called by the DOS 3.1+ kernel
SeeAlso: AX=1103h,AX=1105h,INT 21/AH=3Ah,INT 21/AH=60h
--------N-2F1102-----------------------------
INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - REMOVE REMOTE DIRECTORY
AX = 1102h
SS = DOS DS
SDA first filename pointer -> fully-qualified directory name
SDA CDS pointer -> current directory structure for drive with dir
Return: CF set on error
AX = DOS error code (see #0885 at INT 21/AH=59h)
CF clear if successful
Note: appears to be identical to AX=1101h; MS internal documentation calls
this function "SEQ_RMDIR"
SeeAlso: AX=1101h
--------N-2F1103-----------------------------
INT 2F CU - NETWORK REDIRECTOR - MAKE REMOTE DIRECTORY
AX = 1103h
SS = DOS DS
SDA first filename pointer -> fully-qualified directory name
SDA CDS pointer -> current directory structure for drive with dir
Return: CF set on error
AX = DOS error code (see #0885 at INT 21/AH=59h)
CF clear if successful
Note: this function is called by the DOS 3.1+ kernel
SeeAlso: AX=1101h,AX=1105h,INT 21/AH=39h,INT 21/AH=60h
--------N-2F1104-----------------------------
INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - MAKE REMOTE DIRECTORY
AX = 1104h
SS = DOS DS
SDA first filename pointer -> fully-qualified directory name
SDA CDS pointer -> current directory structure for drive with dir
Return: CF set on error
AX = DOS error code (see #0885 at INT 21/AH=59h)
CF clear if successful
Note: appears to be identical to AX=1103h
SeeAlso: AX=1103h
--------N-2F1105-----------------------------
INT 2F CU - NETWORK REDIRECTOR - CHDIR
AX = 1105h
SS = DOS DS
SDA first filename pointer -> fully-qualified directory name
SDA CDS pointer -> current directory structure for drive with dir
Return: CF set on error
AX = DOS error code (see #0885 at INT 21/AH=59h)
CF clear if successful
CDS updated with new path
Notes: this function is called by the DOS 3.1+ kernel
directory string in CDS should not have a terminating backslash unless
the current directory is the root
SeeAlso: AX=1101h,AX=1103h,INT 21/AH=3Bh,INT 21/AH=60h
--------N-2F1106-----------------------------
INT 2F CU - NETWORK REDIRECTOR - CLOSE REMOTE FILE
AX = 1106h
BX = device info word from SFT
ES:DI -> SFT
SFT DPB field -> DPB of drive containing file
Return: CF set on error
AX = DOS error code (see #0885 at INT 21/AH=59h)
CF clear if successful
SFT updated (redirector must decrement open count, which may be
done with INT 2F/AX=1208h)
Note: this function is called by the DOS 3.1+ kernel
SeeAlso: AX=1116h,AX=1201h,AX=1208h,AX=1227h,INT 21/AH=3Eh
--------N-2F1107-----------------------------
INT 2F CU - NETWORK REDIRECTOR - COMMIT REMOTE FILE
AX = 1107h
ES:DI -> SFT
SFT DPB field -> DPB of drive containing file
Return: CF set on error
AX = DOS error code (see #0885 at INT 21/AH=59h)
CF clear if successful
all buffers for file flushed
directory entry updated
Note: this function is called by the DOS 3.1+ kernel
SeeAlso: INT 21/AH=68h,INT 21/AX=5D01h
--------N-2F1108-----------------------------
INT 2F CU - NETWORK REDIRECTOR - READ FROM REMOTE FILE
AX = 1108h
ES:DI -> SFT
SFT DPB field -> DPB of drive containing file
CX = number of bytes
SS = DOS DS
SDA DTA field -> user buffer
Return: CF set on error
AX = DOS error code (see #0885 at INT 21/AH=59h)
CF clear if successful
CX = number of bytes read (0000h = end of file)
SFT updated
Note: this function is called by the DOS 3.1+ kernel
SeeAlso: AX=1109h,AX=1229h,INT 21/AH=3Fh,INT 21/AX=5D06h
--------N-2F1109-----------------------------
INT 2F CU - NETWORK REDIRECTOR - WRITE TO REMOTE FILE
AX = 1109h
ES:DI -> SFT
SFT DPB field -> DPB of drive containing file
CX = number of bytes
SS = DOS DS
SDA DTA field -> user buffer
Return: CF set on error
AX = DOS error code (see #0885 at INT 21/AH=59h)
CF clear if successful
CX = number of bytes written
SFT updated
Notes: this function is called by the DOS 3.1+ kernel
PrintCache v3.1 PCACHE.EXE intercepts this function for SFTs where
the Device Driver Header field points at PCACHE, but does not
intercept any other network redirector functions
SeeAlso: AX=1107h,AX=1108h,INT 21/AH=40h,INT 21/AX=5D06h
--------N-2F110A-----------------------------
INT 2F CU - NETWORK REDIRECTOR (DOS 3.x only) - LOCK REGION OF FILE
AX = 110Ah
BX = file handle
CX:DX = starting offset
SI = high word of size
STACK: WORD low word of size
ES:DI -> SFT
SFT DPB field -> DPB of drive containing file
SS = DOS DS
Return: CF set on error
AL = DOS error code (see #0885 at INT 21/AH=59h)
STACK unchanged
Notes: this function is called by the DOS 3.10-3.31 kernel
the redirector is expected to resolve lock conflicts
SeeAlso: AX=110Bh,INT 21/AH=5Ch
--------N-2F110A-----------------------------
INT 2F CU - NETWORK REDIRECTOR (DOS 4+) - LOCK/UNLOCK REGION OF FILE
AX = 110Ah
BL = function
00h lock
01h unlock
CX = number of lock/unlock parameters (0001h for DOS 4.0-6.1)
DS:DX -> parameter block (see #1391)
ES:DI -> SFT
SFT DPB field -> DPB of drive containing file
SS = DOS DS
Return: CF set on error
AL = DOS error code (see #0885 at INT 21/AH=59h)
Notes: this function is called by the DOS 4.0+ kernel
the redirector is expected to resolve lock conflicts
SeeAlso: AX=110Bh,INT 21/AH=5Ch
Format of parameter block entry [array, but currently limited to single entry]:
Offset Size Description (Table 1391)
00h DWORD start offset
04h DWORD size of region
--------N-2F110B-----------------------------
INT 2F CU - NETWORK REDIRECTOR (DOS 3.x only) - UNLOCK REGION OF FILE
AX = 110Bh
BX = file handle
CX:DX = starting offset
SI = high word of size
STACK: WORD low word of size
ES:DI -> SFT for file
SFT DPB field -> DPB of drive containing file
Return: CF set on error
AL = DOS error code (see #0885 at INT 21/AH=59h)
STACK unchanged
Note: this function is called by the DOS 3.1-3.31 kernel; DOS 4.0+ calls AX=110Ah instead
SeeAlso: AX=110Ah,INT 21/AH=5Ch
--------N-2F110C-----------------------------
INT 2F CU - NETWORK REDIRECTOR - GET DISK INFORMATION
AX = 110Ch
ES:DI -> current directory structure for desired drive
Return: CF clear if data valid
AL = sectors per cluster
AH = media ID byte
BX = total clusters
CX = bytes per sector
DX = number of available clusters
CF set if data invalid
Note: this function is called by the DOS 3.1+ kernel
SeeAlso: INT 21/AH=36h
--------N-2F110D-----------------------------
INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - SET REMOTE FILE'S ATTRIBUTES
AX = 110Dh
SDA first filename pointer -> name of file
???
Return: ???
Note: similar to AX=110Eh
SeeAlso: AX=110Eh
--------N-2F110E-----------------------------
INT 2F CU - NETWORK REDIRECTOR - SET REMOTE FILE'S ATTRIBUTES
AX = 110Eh
SS = DOS DS
SDA first filename pointer -> fully-qualified name of file
SDA CDS pointer -> current directory structure for drive with file
STACK: WORD new file attributes
Return: CF set on error
AX = DOS error code (see #0885 at INT 21/AH=59h)
CF clear if successful
STACK unchanged
Note: this function is called by the DOS 3.1+ kernel
SeeAlso: AX=110Dh,AX=110Fh,INT 21/AX=4301h,INT 21/AH=60h
--------N-2F110F-----------------------------
INT 2F CU - NETWORK REDIRECTOR - GET REMOTE FILE'S ATTRIBUTES AND SIZE
AX = 110Fh
SS = DOS DS
SDA first filename pointer -> fully-qualified name of file
SDA CDS pointer -> current directory structure for drive with file
Return: CF set on error
AX = DOS error code (see #0885 at INT 21/AH=59h)
CF clear if successful
AX = file attributes
BX:DI = file size
Note: this function is called by the DOS 3.1+ kernel
SeeAlso: AX=110Eh,INT 21/AX=4300h,INT 21/AH=60h
--------N-2F1110-----------------------------
INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - GET REMOTE FILE'S ATTRIBUTES AND SIZE
AX = 1110h
SDA first filename pointer -> name of file
???
Return: ???
Note: appears to be similar to AX=110Fh
SeeAlso: AX=110Eh
--------N-2F1111-----------------------------
INT 2F CU - NETWORK REDIRECTOR - RENAME REMOTE FILE
AX = 1111h
SS = DS = DOS DS
SDA first filename pointer = offset of fully-qualified old name
SDA second filename pointer = offset of fully-qualified new name
SDA CDS pointer -> current directory structure for drive with file
Return: CF set on error
AX = DOS error code (see #0885 at INT 21/AH=59h)
CF clear if successful
Note: this function is called by the DOS 3.1+ kernel
SeeAlso: AX=1112h,INT 21/AH=56h,INT 21/AH=60h
--------N-2F1112-----------------------------
INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - RENAME REMOTE FILE
AX = 1112h
SS = DS = DOS DS
SDA first filename pointer -> name of file
???
Return: ???
Note: similar to AX=1111h
SeeAlso: AX=1111h
--------N-2F1113-----------------------------
INT 2F CU - NETWORK REDIRECTOR - DELETE REMOTE FILE
AX = 1113h
SS = DS = DOS DS
SDA first filename pointer -> fully-qualified filename in DOS DS
SDA CDS pointer -> current directory structure for drive with file
Return: CF set on error
AX = DOS error code (see #0885 at INT 21/AH=59h)
CF clear if successful
Notes: this function is called by the DOS 3.1+ kernel
the filespec may contain wildcards
SeeAlso: AX=1114h,INT 21/AH=41h,INT 21/AH=60h
--------N-2F1114-----------------------------
INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - DELETE REMOTE FILE
AX = 1114h
SDA first filename pointer -> name of file
???
Return: ???
Note: similar to AX=1113h
SeeAlso: AX=1113h
--------N-2F1115-----------------------------
INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - OPEN REMOTE FILE
AX = 1115h
SS = DOS DS
ES:DI -> SFT ???
???
Return: ???
Note: similar to AX=1116h
SeeAlso: AX=1116h,AX=112Eh
--------N-2F1116-----------------------------
INT 2F CU - NETWORK REDIRECTOR - OPEN EXISTING REMOTE FILE
AX = 1116h
ES:DI -> uninitialized SFT
SS = DOS DS
SDA first filename pointer -> fully-qualified name of file to open
STACK: WORD file access and sharing modes (see #0627 at INT 21/AH=3Dh)
Return: CF set on error
AX = DOS error code (see #0885 at INT 21/AH=59h)
CF clear if successful
SFT filled (except handle count, which DOS manages itself)
STACK unchanged
Note: this function is called by the DOS 3.1+ kernel
SeeAlso: AX=1106h,AX=1115h,AX=1117h,AX=1118h,AX=112Eh,INT 21/AH=3Dh
SeeAlso: INT 21/AH=60h
--------N-2F1117-----------------------------
INT 2F CU - NETWORK REDIRECTOR - CREATE/TRUNCATE REMOTE FILE
AX = 1117h
ES:DI -> uninitialized SFT
SS = DOS DS
SDA first filename pointer -> fully-qualified name of file to open
SDA CDS pointer -> current directory structure for drive with file
STACK: WORD file creation mode
low byte = file attributes (see #0626 at INT 21/AH=3Ch)
high byte = 00h normal create, 01h create new file
Return: CF set on error
AX = DOS error code (see #0885 at INT 21/AH=59h)
CF clear if successful
SFT filled (except handle count, which DOS manages itself)
STACK unchanged
Note: this function is called by the DOS 3.1+ kernel
SeeAlso: AX=1106h,AX=1116h,AX=1118h,AX=112Eh,INT 21/AH=3Ch,INT 21/AH=60h
--------N-2F1118-----------------------------
INT 2F CU - NETWORK REDIRECTOR - CREATE/TRUNCATE FILE WITHOUT CDS
AX = 1118h
ES:DI -> uninitialized SFT
SS = DOS DS
SDA first filename pointer -> fully-qualified name of file
STACK: WORD file creation mode
low byte = file attributes
high byte = 00h normal create, 01h create new file
Return: ???
STACK unchanged
Note: this function is called by the DOS 3.1+ kernel when creating a file
on a drive for which the SDA CDS pointer has offset FFFFh
SeeAlso: AX=1106h,AX=1116h,AX=1117h,AX=112Eh,INT 21/AH=60h
--------N-2F1119-----------------------------
INT 2F CU - NETWORK REDIRECTOR - FIND FIRST FILE WITHOUT CDS
AX = 1119h
SS = DS = DOS DS
[DTA] = uninitialized 21-byte findfirst search data
(see #0839 at INT 21/AH=4Eh)
SDA first filename pointer -> fully-qualified search template
SDA search attribute = attribute mask for search
Return: CF set on error
AX = DOS error code (see #0885 at INT 21/AH=59h)
CF clear if successful
[DTA] = updated findfirst search data
(bit 7 of first byte must be set)
[DTA+15h] = standard directory entry for file
Notes: this function is called by the DOS 3.1+ kernel
DOS 4.x IFSFUNC returns CF set, AX=0003h
SeeAlso: AX=111Ah,AX=111Bh
--------N-2F111A-----------------------------
INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - FIND NEXT FILE WITHOUT CDS
AX = 111Ah
???
Return: CF set
AX = error code (03h for DOS 4.01 IFSFUNC)
Note: use AX=111Ch for DOS 5+
SeeAlso: AX=1119h,AX=111Ch
--------N-2F111B-----------------------------
INT 2F CU - NETWORK REDIRECTOR - FINDFIRST
AX = 111Bh
SS = DS = DOS DS
[DTA] = uninitialized 21-byte findfirst search data
(see #0839 at INT 21/AH=4Eh)
SDA first filename pointer -> fully-qualified search template
SDA CDS pointer -> current directory structure for drive with file
SDA search attribute = attribute mask for search
Return: CF set on error
AX = DOS error code (see #0885 at INT 21/AH=59h)
CF clear if successful
[DTA] = updated findfirst search data
(bit 7 of first byte must be set)
[DTA+15h] = standard directory entry for file
Note: this function is called by the DOS 3.1+ kernel
SeeAlso: AX=1119h,AX=111Ch,INT 21/AH=4Eh,INT 21/AH=60h
--------N-2F111C-----------------------------
INT 2F CU - NETWORK REDIRECTOR - FINDNEXT
AX = 111Ch
SS = DS = DOS DS
ES:DI -> CDS
[DTA] = 21-byte findfirst search data
(see #0839 at INT 21/AH=4Eh)
Return: CF set on error
AX = DOS error code (see #0885 at INT 21/AH=59h)
CF clear if successful
[DTA] = updated findfirst search data
(bit 7 of first byte must be set)
[DTA+15h] = standard directory entry for file
Note: this function is called by the DOS 3.1+ kernel
SeeAlso: AX=1119h,AX=111Bh,INT 21/AH=4Fh
--------N-2F111D-----------------------------
INT 2F CU - NETWORK REDIRECTOR - CLOSE ALL REMOTE FILES FOR PROCESS (ABORT)
AX = 111Dh
SS = DOS DS
SDA PSP segment field = PSP of terminating process
Return: nothing
Notes: used when a process is aborted; the process being terminated is
indicated by the "sharing PSP" field in the SDA (offset 1Ah/1Ch)
this function is called by the DOS 3.1+ kernel
closes all FCBs opened by process
SeeAlso: INT 21/AX=5D04h
--------N-2F111E-----------------------------
INT 2F CU - NETWORK REDIRECTOR - DO REDIRECTION
AX = 111Eh
SS = DOS DS
STACK: WORD function to execute
5F00h get redirection mode
BL = type (03h printer, 04h disk)
Return: BH = state (00h off, 01h on)
5F01h set redirection mode
BL = type (03h printer, 04h disk)
BH = state (00h off, 01h on)
5F02h get redirection list entry
BX = redirection list index
DS:SI -> 16-byte local device name buffer
ES:DI -> 128-byte network name buffer
Return: must set user's BX to device type and CX to
stored parameter value, using AX=1218h to get
stack frame address
5F03h redirect device
BL = device type (see INT 21/AX=5F03h)
CX = stored parameter value
DS:SI -> ASCIZ source device name
ES:DI -> destination ASCIZ network path + ASCIZ passwd
5F04h cancel redirection
DS:SI -> ASCIZ device name or network path
5F05h get redirection list extended entry
BX = redirection list index
DS:SI -> buffer for ASCIZ source device name
ES:DI -> buffer for destination ASCIZ network path
Return: BH = status flag
BL = type (03h printer, 04h disk)
CX = stored parameter value
BP = NETBIOS local session number
5F06h similar to 5F05h???
Return: CF set on error
AX = error code (see #0885 at INT 21/AH=59h)
STACK unchanged
Notes: this function is called by the DOS 3.1+ kernel on INT 21/AH=5Fh
(including LAN Manager calls)
the PC Network 1.00 redirector does not support function 5F06h
SeeAlso: INT 21/AX=5F00h,INT 21/AX=5F01h,INT 21/AX=5F02h,INT 21/AX=5F03h
SeeAlso: INT 21/AX=5F04h,INT 21/AX=5F05h,INT 21/AX=5F06h
--------N-2F111F-----------------------------
INT 2F CU - NETWORK REDIRECTOR - PRINTER SETUP
AX = 111Fh
STACK: WORD function
5E02h set printer setup
5E03h get printer setup
5E04h set printer mode
5E05h get printer mode
Return: CF set on error
AX = error code (see #0885 at INT 21/AH=59h)
STACK unchanged
Note: this function is called by the DOS 3.1+ kernel
SeeAlso: INT 21/AX=5E02h,INT 21/AX=5E03h,INT 21/AX=5E04h,INT 21/AX=5E05h
--------N-2F1120-----------------------------
INT 2F CU - NETWORK REDIRECTOR - FLUSH ALL DISK BUFFERS
AX = 1120h
DS = DOS DS
???
Return: CF clear (successful)
Notes: this function is called by the DOS 3.1+ kernel
uses CDS array pointer and LASTDRIVE= entries in DOS list of lists
SeeAlso: INT 21/AH=0Dh,INT 21/AX=5D01h
--------N-2F1121-----------------------------
INT 2F CU - NETWORK REDIRECTOR - SEEK FROM END OF REMOTE FILE
AX = 1121h
CX:DX = offset (in bytes) from end
ES:DI -> SFT
SFT DPB field -> DPB of drive with file
SS = DOS DS
Return: CF set on error
AL = DOS error code (see #0885 at INT 21/AH=59h)
CF clear if successful
DX:AX = new file position
Note: this function is called by the DOS 3.1+ kernel, but only when seeking
from the end of a file opened with sharing modes set in such a
manner that another process is able to change the size of the file
while it is already open
SeeAlso: AX=1228h,INT 21/AH=42h
--------N-2F1122-----------------------------
INT 2F CU - NETWORK REDIRECTOR - PROCESS TERMINATION HOOK
AX = 1122h
SS = DOS DS
DS = PSP of process about to terminate
Return: ???
Notes: this function is called by the DOS 3.1+ kernel
after calling this function, the kernel calls INT 2F/AX=111Dh
SeeAlso: AX=111Dh,INT 21/AH=4Ch,INT 60/DI=0601h
--------N-2F1123-----------------------------
INT 2F CU - NETWORK REDIRECTOR - QUALIFY REMOTE FILENAME
AX = 1123h
DS:SI -> ASCIZ filename to canonicalize
ES:DI -> 128-byte buffer for qualified name
Return: CF set if not resolved
Notes: called by MS-DOS 3.1+ kernel, but not called by DR-DOS 5.0 unless the
filename matches the name of a character device
called first when DOS attempts to resolve a filename (unless inside an
AX=5D00h server call); if this fails, DOS resolves the name locally
SeeAlso: AX=1221h,INT 21/AH=60h
--------N-2F1124-----------------------------
INT 2F CU - NETWORK REDIRECTOR - TURN OFF REMOTE PRINTER
AX = 1124h
ES:DI -> SFT
SS = DOS DS
???
Return: CX = ???
Note: this function is called by the DOS 3.1+ kernel if AX=1126h returns CF set
SeeAlso: AX=1126h
--------N-2F1125-----------------------------
INT 2F CU - NETWORK REDIRECTOR - REDIRECTED PRINTER MODE
AX = 1125h
STACK: WORD subfunction
5D07h get print stream state
Return: DL = current state
5D08h set print stream state
DL = new state
5D09h finish print job
Return: CF set on error
AX = error code (see #0885 at INT 21/AH=59h)
STACK unchanged
Note: this function is called by the DOS 3.1+ kernel
SeeAlso: INT 21/AX=5D07h,INT 21/AX=5D08h,INT 21/AX=5D09h
--------N-2F1126-----------------------------
INT 2F CU - NETWORK REDIRECTOR - REMOTE PRINTER ECHO ON/OFF
AX = 1126h
ES:DI -> SFT for file handle 4???
SS = DOS DS???
???
Return: CF set on error
Notes: this function is called by the DOS 3.1+ kernel
called when print echoing (^P, ^PrtSc) changes state and STDPRN has
bit 11 of the device information word in the SFT set
SeeAlso: AX=1124h
--------N-2F1127-----------------------------
INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - UNUSED
AX = 1127h
Return: CF set
AX = 0001h (invalid function) (see #0885 at INT 21/AH=59h)
--------N-2F1128-----------------------------
INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - UNUSED
AX = 1128h
Return: CF set
AX = 0001h (invalid function) (see #0885 at INT 21/AH=59h)
--------N-2F1129-----------------------------
INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - UNUSED
AX = 1129h
Return: CF set
AX = 0001h (invalid function) (see #0885 at INT 21/AH=59h)
--------N-2F112A-----------------------------
INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - CLOSE ALL FILES FOR PROCESS
AX = 112Ah
DS = DOS DS
???
Return: ???
Note: does something to each IFS driver
--------N-2F112B-----------------------------
INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - GENERIC IOCTL
AX = 112Bh
SS = DOS DS
CX = function/category
DS:DX -> parameter block
STACK: WORD value of AX on entry to INT 21 (440Ch or 440Dh)
???
Return: CF set on error
AX = DOS error code (see #0885 at INT 21/AH=59h)
CF clear if successful
Note: this function is called by the DOS 4.0 kernel
--------N-2F112C-----------------------------
INT 2F CU - NETWORK REDIRECTOR (DOS 4+) - "UPDATE_CB" - ???
AX = 112Ch
SS = DOS DS
SDA current SFT pointer -> SFT for file
???
Return: CF set on error
Note: called by SHARE in DOS 5.0-6.0
--------N-2F112D-----------------------------
INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - EXTENDED ATTRIBUTES
AX = 112Dh
BL = subfunction (value of AL on INT 21)
02h get extended attributes
03h get extended attribute properties
04h set extended attributes
Return: CF clear
else ???
Return: CX = ??? (00h or 02h for DOS 4.01)
ES:DI -> SFT for file
SS = DOS DS
Return: DS = DOS DS
Note: this function is called by the DOS 4.0 kernel on INT 21/AX=5702h,
INT 21/AX=5703h, and INT 21/AX=5704h
SeeAlso: INT 21/AX=5702h,INT 21/AX=5703h,INT 21/AX=5704h,INT 21/AH=6Eh
--------N-2F112E-----------------------------
INT 2F CU - NETWORK REDIRECTOR (DOS 4+) - EXTENDED OPEN/CREATE FILE
AX = 112Eh
SS = DS = DOS DS
ES:DI -> uninitialized SFT for file
STACK: WORD file attribute for created/truncated file
low byte = file attributes
high byte = 00h normal create/open, 01h create new file
SDA first filename pointer -> fully-qualified filename
SDA extended file open action = action code
(see #0966 at INT 21/AX=6C00h)
SDA extended file open mode = open mode for file (see INT 21/AX=6C00h)
Return: CF set on error
AX = error code
CF clear if successful
CX = result code
01h file opened
02h file created
03h file replaced (truncated)
SFT initialized (except handle count, which DOS manages itself)
Note: this function is called by the DOS 4+ kernel
BUG: this function is not called correctly under some DOS versions
(at least 5.0 and 6.2):
the file attribute on the stack is not correct if the action
code is 11h,
the result code in CX is not passed back to the application.
SeeAlso: AX=1115h,AX=1116h,AX=1117h,INT 21/AX=6C00h
--------N-2F112F-----------------------------
INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - IFS IOCTL
AX = 112Fh
SS = DOS DS
STACK: WORD function in low byte
00h ???
DS:SI -> Current Directory Structure???
CL = drive (1=A:)
01h ???
DS:SI -> ???
CL = file handle???
02h ???
DS:SI -> Current Directory Structure???
DI = ???
CX = drive (1=A:)
???
Return: CF set on error
AX = DOS error code (see #0885 at INT 21/AH=59h)
CF clear if successful
Note: this function is called by the DOS 4.0 kernel
SeeAlso: INT 21/AH=6Bh
--------N-2F1130-----------------------------
INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - GET IFSFUNC SEGMENT
AX = 1130h
Return: ES = CS of resident IFSFUNC
--------N-2F1180-----------------------------
INT 2F - LAN Manager Enhanced DOS Services - ???
AX = 1180h
???
Return: ???
--------N-2F1182-----------------------------
INT 2F - LAN Manager Enhanced DOS Services - INSTALL SERVICE
AX = 1182h
???
Return: ???
--------N-2F1184-----------------------------
INT 2F - LAN Manager Enhanced DOS - ???
AX = 1184h
???
Return: ???
--------N-2F1186-----------------------------
INT 2F - LAN Manager Enhanced DOS - DosReadAsynchNmPipe
AX = 1186h
DS:SI -> stack frame (see #1392)
Return: CF clear if successful
CF set if error
AX = error code
Note: LAN Manager enhance mode adds features beyond the standard redirector
file/printer services
SeeAlso: AX=118Fh,AX=1190h,AX=1191h,INT 21/AX=5F39h
Format of LAN Manager DosReadAsynchNmPipe stack frame:
Offset Size Description (Table 1392)
00h DWORD -> number of bytes read
04h WORD size of buffer
06h DWORD -> buffer
0Ah DWORD -> return code
0Eh DWORD function to call on completion as function( char far *buffer )
12h WORD handle
--------N-2F118A-----------------------------
INT 2F - LAN Manager 2.0+ DOS Enhanced ENCRYPT.EXE - STREAM ENCRYPTION SERVICE
AX = 118Ah
BX = function (0000h or 0001h)
Return: CF clear if successful
AX = 1100h success
CF set if error
AX = 0001h, etc.
SeeAlso: AX=1186h,AH=41h,AH=42h,AH=4Bh
--------N-2F118B-----------------------------
INT 2F - LAN Manager Enhanced DOS - ???
AX = 118Bh
???
Return: ???
--------N-2F118C-----------------------------
INT 2F - LAN Manager Enhanced DOS - ???
AX = 118Ch
???
Return: ???
--------N-2F118E-----------------------------
INT 2F - LAN Manager Enhanced DOS - ???
AX = 118Eh
???
Return: ???
--------N-2F118F-----------------------------
INT 2F - LAN Manager Enhanced DOS - DosWriteAsynchNmPipe
AX = 118Fh
DS:SI -> stack frame (see #1393)
Return: CF clear if successful
CF set if error
AX = error code
SeeAlso: AX=1186h,AX=1191h,INT 21/AX=5F3Ah
Format of LAN Manager DosReadAsynchNmPipe stack frame:
Offset Size Description (Table 1393)
00h DWORD -> number of bytes read
04h WORD Size of buffer
06h DWORD -> buffer
0Ah DWORD -> return code
0Eh DWORD function to call on completion as function( char far *buffer )
12h WORD handle
--------N-2F1190-----------------------------
INT 2F - LAN Manager Enhanced DOS - DosReadAsynchNmPipe2
AX = 1190h
DS:SI -> stack frame (see #1394)
Return: CF clear if successful
CF set if error
AX = error code
SeeAlso: AX=1186h,AX=1191h
Format of LAN Manager DosReadAsynchNmPipe2 stack frame:
Offset Size Description (Table 1394)
00h DWORD -> number of bytes read
04h WORD size of buffer
06h DWORD -> buffer
0Ah DWORD -> return code
0Eh DWORD function to call on completion as function( char far *buffer )
12h WORD handle
14h DWORD ???
--------N-2F1191-----------------------------
INT 2F - LAN Manager Enhanced DOS - DosWriteAsynchNmPipe2
AX = 1191h
DS:SI -> stack frame (see #1395)
Return: CF clear if successful
CF set if error
AX = error code
SeeAlso: AX=118Fh,AX=1190h,INT 21/AX=5F3Ah
Format of LAN Manager DosReadAsynchNmPipe2 stack frame:
Offset Size Description (Table 1395)
00h DWORD -> number of bytes read
04h WORD size of buffer
06h DWORD -> buffer
0Ah DWORD -> return code
0Eh DWORD function to call on completion as function( char far *buffer )
12h WORD handle
14h DWORD ???
--------D-2F1200-----------------------------
INT 2F U - DOS 3+ internal - INSTALLATION CHECK
AX = 1200h
Return: AL = FFh (for compatibility with other INT 2F functions)
--------D-2F1201-----------------------------
INT 2F U - DOS 3+ internal - CLOSE CURRENT FILE
AX = 1201h
SS = DOS DS (must be using a DOS internal stack)
SDA current SFT pointer -> SFT of file to close
Return: CF set on error
BX???
CX new reference count of SFT
ES:DI -> SFT for file
SeeAlso: AX=1106h,AX=1227h,INT 21/AH=3Eh
--------D-2F1202-----------------------------
INT 2F U - DOS 3+ internal - GET INTERRUPT ADDRESS
AX = 1202h
STACK: WORD vector number
Return: ES:BX -> interrupt vector
STACK unchanged
--------D-2F1203-----------------------------
INT 2F U - DOS 3+ internal - GET DOS DATA SEGMENT
AX = 1203h
Return: DS = data segment of IBMDOS.COM/MSDOS.SYS
Note: for DOS prior to version 5.0, the data segment is the same as the code
segment
--------D-2F1204-----------------------------
INT 2F U - DOS 3+ internal - NORMALIZE PATH SEPARATOR
AX = 1204h
STACK: WORD character to normalize
Return: AL = normalized character (forward slash turned to backslash, all
others unchanged)
ZF set if path separator
STACK unchanged
--------D-2F1205-----------------------------
INT 2F U - DOS 3+ internal - OUTPUT CHARACTER TO STANDARD OUTPUT
AX = 1205h
STACK: WORD character to output
Return: STACK unchanged
Note: can be called only from within DOS
--------D-2F1206-----------------------------
INT 2F U - DOS 3+ internal - INVOKE CRITICAL ERROR
AX = 1206h
DI = error code
BP:SI -> device driver header
SS = DOS DS (must be using a DOS internal stack)
STACK: WORD value to be passed to INT 24 in AX
Return: AL = 0-3 for Abort, Retry, Ignore, Fail
STACK unchanged
SeeAlso: INT 24
--------D-2F1207-----------------------------
INT 2F U - DOS 3+ internal - MAKE DISK BUFFER MOST-RECENTLY USED
AX = 1207h
DS:DI -> disk buffer
Return: nothing
Desc: move the indicated buffer to the end of the disk buffer chain (least-
recently used is first); under DOS 3.3, the buffer is then moved to
the start of the disk buffer chain if it was marked unused
Notes: can be called only from within DOS
this function is nearly the same as AX=120Fh
SeeAlso: AX=120Fh
--------D-2F1208-----------------------------
INT 2F U - DOS 3+ internal - DECREMENT SFT REFERENCE COUNT
AX = 1208h
ES:DI -> SFT
Return: AX = original value of reference count
Notes: if the reference count was 1, it is set to FFFFh (since 0 indicates
that the SFT is not in use). It is the caller's responsibility to
set the reference count to zero after cleaning up.
used by network redirectors such as MSCDEX
SeeAlso: AX=1106h
--------D-2F1209-----------------------------
INT 2F U - DOS 3+ internal - FLUSH AND FREE DISK BUFFER
AX = 1209h
DS:DI -> disk buffer
Return: disk buffer marked unused, contents written to disk if buffer dirty
Note: can be called only from within DOS
SeeAlso: AX=120Eh,AX=1215h
--------D-2F120A-----------------------------
INT 2F U - DOS 3+ internal - PERFORM CRITICAL ERROR INTERRUPT
AX = 120Ah
DS = SS = DOS DS (must be using a DOS internal stack)
STACK: WORD extended error code
Return: AL = user response (0=ignore, 1=retry, 2=abort, 3=fail)
CF clear if retry, set otherwise
STACK unchanged
Notes: can only be called during a DOS function call, as it uses various
fields in the SDA to set up the registers for the INT 24
reportedly sets current DPB's first root directory sector to 1
SeeAlso: INT 24
--------D-2F120B-----------------------------
INT 2F U - DOS 3+ internal - SIGNAL SHARING VIOLATION TO USER
AX = 120Bh
ES:DI -> system file table entry for previous open of file
STACK: WORD extended error code (should be 20h--sharing violation)
Return: CF clear if operation should be retried
CF set if operation should not be retried
AX = error code (20h) (see #0885 at INT 21/AH=59h)
STACK unchanged
Notes: can only be called during a DOS function call
should only be called if an attempt was made to open an already-open
file contrary to the sharing rules
invokes INT 24 if SFT file opened via FCB or in compatibility mode with
inheritance allowed
--------D-2F120C-----------------------------
INT 2F U - DOS 3+ internal - OPEN DEVICE AND SET SFT OWNER/MODE
AX = 120Ch
SDA current SFT pointer -> SFT for file
DS = DOS DS
SS = DOS DS (must be using a DOS internal stack)
Return: ES, DI, AX destroyed
Notes: invokes "device open" call on device driver for SFT
changes owner of last-accessed SFT to calling process if it was opened
via FCB
called by network redirectors such as MSCDEX
--------D-2F120D-----------------------------
INT 2F U - DOS 3+ internal - GET DATE AND TIME
AX = 120Dh
SS = DOS DS (must be using a DOS internal stack)
Return: AX = current date in packed format (see #0877 at INT 21/AX=5700h)
DX = current time in packed format (see #0876 at INT 21/AX=5700h)
SeeAlso: INT 21/AH=2Ah,INT 21/AH=2Ch
--------D-2F120E-----------------------------
INT 2F U - DOS 3+ internal - MARK ALL DISK BUFFERS UNREFERENCED
AX = 120Eh
SS = DOS DS (must be using a DOS internal stack)
Return: DS:DI -> first disk buffer
Notes: clears "referenced" flag on all disk buffers
in DOS 5+, this has become essentially a NOP, invoking the same code
used by AX=1224h (SHARING DELAY)
SeeAlso: AX=1209h,AX=1210h,INT 21/AH=0Dh
--------D-2F120F-----------------------------
INT 2F U - DOS 3+ internal - MAKE BUFFER MOST RECENTLY USED
AX = 120Fh
DS:DI -> disk buffer
SS = DOS DS (must be using a DOS internal stack)
Return: DS:DI -> next buffer in buffer list
Desc: move the indicated buffer to the end of the disk buffer chain (least-
recently used is first); under DOS 3.3, the buffer is then moved to
the start of the disk buffer chain if it was marked unused
Note: this function is the same as AX=1207h except that it returns a
pointer to the buffer following the specified buffer in the buffer
chain
SeeAlso: AX=1207h
--------D-2F1210-----------------------------
INT 2F U - DOS 3+ internal - FIND UNREFERENCED DISK BUFFER
AX = 1210h
DS:DI -> first disk buffer to check
Return: ZF clear if found
DS:DI -> first unreferenced disk buffer
ZF set if not found
Note: in DOS 5+, this has become essentially a NOP, invoking the same code
used by AX=1224h (SHARING DELAY)
SeeAlso: AX=120Eh
--------D-2F1211-----------------------------
INT 2F U - DOS 3+ internal - NORMALIZE ASCIZ FILENAME
AX = 1211h
DS:SI -> ASCIZ filename to normalize
ES:DI -> buffer for normalized filename
Return: destination buffer filled with uppercase filename, with slashes turned
to backslashes
SeeAlso: AX=121Eh,AX=1221h
--------D-2F1212-----------------------------
INT 2F U - DOS 3+ internal - GET LENGTH OF ASCIZ STRING
AX = 1212h
ES:DI -> ASCIZ string
Return: CX = length of string
SeeAlso: AX=1225h
--------D-2F1213-----------------------------
INT 2F U - DOS 3+ internal - UPPERCASE CHARACTER
AX = 1213h
STACK: WORD character to convert to uppercase
Return: AL = uppercase character
STACK unchanged
--------D-2F1214-----------------------------
INT 2F U - DOS 3+ internal - COMPARE FAR POINTERS
AX = 1214h
DS:SI = first pointer
ES:DI = second pointer
Return: ZF set if pointers are equal, ZF clear if not equal
--------D-2F1215-----------------------------
INT 2F U - DOS 3+ internal - FLUSH BUFFER
AX = 1215h
DS:DI -> disk buffer
SS = DOS DS (must be using a DOS internal stack)
STACK: WORD drives for which to skip buffer
ignore buffer if drive same as high byte, or bytes differ and
the buffer is for a drive OTHER than that given in low byte
Return: STACK unchanged
Note: can be called only from within DOS
SeeAlso: AX=1209h
--------D-2F1216-----------------------------
INT 2F U - DOS 3+ internal - GET ADDRESS OF SYSTEM FILE TABLE ENTRY
AX = 1216h
BX = system file table entry number
Return: CF clear if successful
ES:DI -> system file table entry
CF set if BX greater than FILES=
Note: supported by DR-DOS 5+
SeeAlso: AX=1220h
--------D-2F1217-----------------------------
INT 2F U - DOS 3+ internal - GET CURRENT DIRECTORY STRUCTURE FOR DRIVE
AX = 1217h
SS = DOS DS (must be using a DOS internal stack)
STACK: WORD drive (0 = A:, 1 = B:, etc)
Return: CF set on error
(drive > LASTDRIVE)
CF clear if successful
DS:SI -> current directory structure for specified drive
STACK unchanged
SeeAlso: AX=1219h
--------D-2F1218-----------------------------
INT 2F U - DOS 3+ internal - GET CALLER'S REGISTERS
AX = 1218h
Return: DS:SI -> saved caller's AX,BX,CX,DX,SI,DI,BP,DS,ES (on stack)
Note: only valid while within DOS
--------D-2F1219-----------------------------
INT 2F U - DOS 3+ internal - SET DRIVE???
AX = 1219h
SS = DOS DS (must be using a DOS internal stack)
STACK: WORD drive (0 = default, 1 = A:, etc)
Return: ???
STACK unchanged
Notes: calls AX=1217h
builds a current directory structure if inside server call
(INT 21/AX=5D00h)
SeeAlso: AX=1217h,AX=121Fh
--------D-2F121A-----------------------------
INT 2F U - DOS 3+ internal - GET FILE'S DRIVE
AX = 121Ah
DS:SI -> filename
Return: AL = drive (0 = default, 1 = A:, etc, FFh = invalid)
DS:SI -> filename without leading X: (if present)
SeeAlso: INT 21/AH=19h,INT 21/AH=60h
--------D-2F121B-----------------------------
INT 2F U - DOS 3+ internal - SET YEAR/LENGTH OF FEBRUARY
AX = 121Bh
CL = year - 1980
Return: AL = number of days in February
Note: requires DS to be set to the DOS data segment
SeeAlso: INT 21/AH=2Bh
--------D-2F121C-----------------------------
INT 2F U - DOS 3+ internal - CHECKSUM MEMORY
AX = 121Ch
DS:SI -> start of memory to checksum
CX = number of bytes
DX = initial checksum
SS = DOS DS (must be using a DOS internal stack)
Return: AX, CX destroyed
DX = checksum
DS:SI -> first byte after checksummed range
Notes: used by DOS to determine day count since 1/1/80 given a date
supported by DR-DOS 5.0+
SeeAlso: AX=121Dh
--------D-2F121D-----------------------------
INT 2F U - DOS 3+ internal - SUM MEMORY
AX = 121Dh
DS:SI -> memory to add up
CX = 0000h
DX = limit
Return: AL = byte which exceeded limit
CX = number of bytes before limit exceeded
DX = remainder after adding first CX bytes
DS:SI -> byte beyond the one which exceeded the limit
Notes: used by DOS to determine year or month given day count since 1/1/80
supported by DR-DOS 5.0+
SeeAlso: AX=121Ch
--------D-2F121E-----------------------------
INT 2F U - DOS 3+ internal - COMPARE FILENAMES
AX = 121Eh
DS:SI -> first ASCIZ filename
ES:DI -> second ASCIZ filename
Return: ZF set if filenames equivalent, ZF clear if not
Note: supported by DR-DOS 5.0+
SeeAlso: AX=1211h,AX=1221h
--------D-2F121F-----------------------------
INT 2F U - DOS 3+ internal - BUILD CURRENT DIRECTORY STRUCTURE
AX = 121Fh
SS = DOS DS (must be using a DOS internal stack)
STACK: WORD drive letter
Return: ES:DI -> current directory structure (will be overwritten by next call)
STACK unchanged
--------D-2F1220-----------------------------
INT 2F U - DOS 3+ internal - GET JOB FILE TABLE ENTRY
AX = 1220h
BX = file handle
Return: CF set on error
AL = 6 (invalid file handle)
CF clear if successful
ES:DI -> JFT entry for file handle in current process
Notes: the byte pointed at by ES:DI contains the number of the SFT for the
file handle, or FFh if the handle is not open
supported by DR-DOS 5.0+
SeeAlso: AX=1216h,AX=1229h
--------D-2F1221-----------------------------
INT 2F U - DOS 3+ internal - CANONICALIZE FILE NAME
AX = 1221h
DS:SI -> file name to be fully qualified
ES:DI -> 128-byte buffer for resulting canonical file name
SS = DOS DS (must be using a DOS internal stack)
Return: (see INT 21/AH=60h)
Note: identical to INT 21/AH=60h
SeeAlso: AX=1123h,INT 21/AH=60h
--------D-2F1222-----------------------------
INT 2F U - DOS 3+ internal - SET EXTENDED ERROR INFO
AX = 1222h
SS = DOS data segment
SS:SI -> 4-byte records
BYTE error code, FFh = last record
BYTE error class, FFh = don't change
BYTE suggested action, FFh = don't change
BYTE error locus, FFh = don't change
SDA error code set
Return: SI destroyed
SDA error class, error locus, and suggested action fields set
Note: can be called only from within DOS
SeeAlso: AX=122Dh,INT 21/AH=59h,INT 21/AX=5D0Ah
--------D-2F1223-----------------------------
INT 2F U - DOS 3+ internal - CHECK IF CHARACTER DEVICE
AX = 1223h
DS = DOS DS
SS = DOS DS (must be using a DOS internal stack)
SDA+218h (DOS 3.10-3.30) = eight-character blank-padded name
SDA+22Bh (DOS 4.0-6.0) = eight-character blank-padded name
Return: CF set if no character device by that name found
CF clear if found
BH = low byte of device attribute word
Note: can only be called from within DOS
SeeAlso: INT 21/AX=5D06h,INT 21/AX=5D0Bh
--------D-2F1224-----------------------------
INT 2F U - DOS 3+ internal - SHARING RETRY DELAY
AX = 1224h
SS = DOS DS (must be using a DOS internal stack)
Return: after delay set by INT 21/AX=440Bh, unless in server call
(INT 21/AX=5D00h)
Note: delay is dependent on the processor speed, and is skipped entirely if
inside a server call
SeeAlso: INT 21/AX=440Bh,INT 21/AH=52h,INT 62/AX=0097h
--------D-2F1225-----------------------------
INT 2F U - DOS 3+ internal - GET LENGTH OF ASCIZ STRING
AX = 1225h
DS:SI -> ASCIZ string
Return: CX = length of string
Note: supported by DR-DOS 5.0+
SeeAlso: AX=1212h
--------D-2F1226-----------------------------
INT 2F U - DOS 3.3+ internal - OPEN FILE
AX = 1226h
CL = access mode
DS:DX -> ASCIZ filename
SS = DOS DS (must be using a DOS internal stack)
Return: CF set on error
AL = error code (see #0885 at INT 21/AH=59h)
CF clear if successful
AX = file handle
Notes: can only be called from within DOS
equivalent to INT 21/AH=3Dh
used by NLSFUNC to access COUNTRY.SYS when invoked by the DOS kernel
SeeAlso: AX=1227h,INT 21/AH=3Dh
--------D-2F1227-----------------------------
INT 2F U - DOS 3.3+ internal - CLOSE FILE
AX = 1227h
BX = file handle
SS = DOS DS (must be using a DOS internal stack)
Return: CF set on error
AL = 06h invalid file handle
CF clear if successful
Notes: can only be called from within DOS
equivalent to INT 21/AH=3Eh
used by NLSFUNC to access COUNTRY.SYS when invoked by the DOS kernel
SeeAlso: AX=1106h,AX=1201h,AX=1226h,INT 21/AH=3Eh
--------D-2F1228BP4200-----------------------
INT 2F U - DOS 3.3+ internal - MOVE FILE POINTER
AX = 1228h
BP = 4200h, 4201h, 4202h (see INT 21/AH=42h)
BX = file handle
CX:DX = offset in bytes
SS = DOS DS (must be using a DOS internal stack)
Return: as for INT 21/AH=42h
Notes: equivalent to INT 21/AH=42h, but may only be called from inside a DOS
function call
sets user stack frame pointer to dummy buffer, moves BP to AX, performs
LSEEK, and restores frame pointer
used by NLSFUNC to access COUNTRY.SYS when invoked by the DOS kernel
SeeAlso: INT 21/AH=42h
--------D-2F1229-----------------------------
INT 2F U - DOS 3.3+ internal - READ FROM FILE
AX = 1229h
BX = file handle
CX = number of bytes to read
DS:DX -> buffer
SS = DOS DS (must be using a DOS internal stack)
Return: as for INT 21/AH=3Fh
Notes: equivalent to INT 21/AH=3Fh, but may only be called when already inside
a DOS function call
used by NLSFUNC to access COUNTRY.SYS when invoked by the DOS kernel
SeeAlso: AX=1226h,INT 21/AH=3Fh
--------D-2F122A-----------------------------
INT 2F U - DOS 3.3+ internal - SET FASTOPEN ENTRY POINT
AX = 122Ah
BX = entry point to set (0001h or 0002h)
DS:SI -> FASTOPEN entry point (see #1396,#1397)
(entry point not set if SI = FFFFh for DOS 4+)
Return: CF set if specified entry point already set
Notes: entry point in BX is ignored under DOS 3.30
both entry points set to same handler by DOS 4.01
DOS 5.0 and 6.0 only set entry point 1
(Table 1396)
Values DOS 3.30+ FASTOPEN entry point is called with:
AL = 01h Lookup
CX = ??? seems to be offset
DI = ??? seems to be offset
SI = offset in DOS DS of filename
AL = 02h insert file into FASTOPEN cache
AL = 03h delete file from FASTOPEN cache
SI = offset in DOS DS of filename
AL = 04h purge FASTOPEN cache
AH = subfunction (00h,01h,02h)
ES:DI -> ???
CX = ??? (subfunctions 01h and 02h only)
Returns: CF set on error or not installed
Note: function 03h calls function 01h first
SeeAlso: #1397,#1398
(Table 1397)
Values PC-DOS 4.01 FASTOPEN is additionally called with:
AL = 04h ???
AH = 03h
???
AL = 05h ???
AL = 0Bh ???
AL = 0Ch ???
AL = 0Dh ???
AL = 0Eh ???
AL = 0Fh ???
AL = 10h ???
SeeAlso: #1396,#1398
(Table 1398)
Values MS-DOS 5.0-6.0 FASTOPEN is additionally called with:
AL = 04h purge FASTOPEN cache
AH = 03h
???
AL = 05h ???
DL = drive (00h = A:)
???
AL = 06h ???
???
SeeAlso: #1396,#1397
--------D-2F122B-----------------------------
INT 2F U - DOS 3.3+ internal - IOCTL
AX = 122Bh
BP = 44xxh
SS = DOS DS (must be using a DOS internal stack)
additional registers as appropriate for INT 21/AX=44xxh
Return: as for INT 21/AH=44h
Notes: equivalent to INT 21/AH=44h, but may only be called when already inside
a DOS function call
sets user stack frame pointer to dummy buffer, moves BP to AX, performs
IOCTL, and restores frame pointer
used by NLSFUNC in accessing COUNTRY.SYS when invoked by the DOS kernel
SeeAlso: INT 21/AH=44h
--------D-2F122C-----------------------------
INT 2F U - DOS 3.3+ internal - GET DEVICE CHAIN
AX = 122Ch
Return: BX:AX -> header of second device driver (NUL is first) in driver chain
Note: although this function exists in DR-DOS 5.0 and Novell DOS 7, it
always returns 0000h:0000h
SeeAlso: INT 21/AH=52h
--------D-2F122D-----------------------------
INT 2F U - DOS 3.3+ internal - GET EXTENDED ERROR CODE
AX = 122Dh
Return: AX = current extended error code
SeeAlso: AX=1222h,INT 21/AH=59h
--------D-2F122E-----------------------------
INT 2F U - DOS 4+ internal - GET OR SET ERROR TABLE ADDRESSES
AX = 122Eh
DL = subfunction
00h get standard DOS error table (see #1399)
Return: ES:DI -> error table
(DOS 4: errors 00h-12h,50h-5Bh)
(DOS 5: errors 00h-26h,4Fh,51h-59h)
01h set standard DOS error table
ES:DI -> error table
02h get parameter error table (errors 00h-0Ah)
Return: ES:DI -> error table
03h set parameter error table
ES:DI -> error table
04h get critical/SHARE error table (errors 13h-2Bh)
Return: ES:DI -> error table
05h set critical/SHARE error table
ES:DI -> error table
06h get ??? error table
Return: ES:DI -> error table or 0000h:0000h
07h set ??? error table
ES:DI -> error table
08h get error message retriever (see #1400)
Return: ES:DI -> FAR procedure to fetch error message
09h set ??? error table
ES:DI -> error table
Notes: if the returned segment on a "get" is 0001h, then the offset specifies
the offset of the error message table within COMMAND.COM, and the
procedure returned by DL=08h should be called
DOS 5+ COMMAND.COM does not allow setting any of the addresses (calls
with DL odd are ignored); they are always returned with segment 0001h
for DOS 5.0, the standard and critical/SHARE error tables are combined
into a single error table
SeeAlso: AX=0500h,INT 21/AH=59h
Format of DOS 4.x error table:
Offset Size Description (Table 1399)
00h BYTE FFh
01h 2 BYTEs 04h,00h (DOS version???)
03h BYTE number of error headers following
04h 2N WORDs table of all error headers for table
Offset Size Description
00h WORD error message number
02h WORD offset of error message from start of header
error messages are count byte followed by msg
Note: DOS 5 error tables consist of one word per error number; each word
contains either the offset of a counted string or 0000h
(Table 1400)
Call error retrieval function with:
AX = error number (see #1401)
DI = offset of error table
Return: ES:DI -> error message (counted string)
Notes: this function needs to access COMMAND.COM if the messages were not
loaded into memory permanently with /MSG; the caller should assume
that the returned message will be overwritten by the next call of
the function
supported by DR-DOS 5.0
(Table 1401)
Values for parameter errors:
01h Too many parameters
02h Required Parameter missing
03h Invalid switch
04h Invalid keyword
06h Parameter value not in allowed range
07h Parameter value not allowed
08h Parameter value not allowed
09h Parameter format not correct
0Ah Invalid parameter
0Bh Invalid parameter combination
--------D-2F122F-----------------------------
INT 2F U - DOS 4.x internal - SET DOS VERSION NUMBER TO RETURN
AX = 122Fh
DX = DOS version number (0000h = return true DOS version)
Note: not available under DR-DOS 5.0 or 6.0
SeeAlso: INT 21/AH=30h,INT 21/AX=3306h
--------m-2F12FFBX0006-----------------------
INT 2F U - DR-DOS 6, Novell DOS 7 - EMM386.EXE - VIDEO MEMORY SPACE CONTROL
AX = 12FFh
BX = 0006h
DX = 0000h
CX = function
0000h get status of video memory space (MEMMAX /V)
0001h map memory into video memory space (MEMMAX +V)
0002h unmap memory from video memory space (MEMMAX -V)
Return: CF clear if successful
AX = 0000h (successful)
BX = segment of reserved video RAM
CX = segment of used video RAM
DX = segment of first upper MCB
Notes: this functionality is provided by EMM386, and partially supported by
HIDOS.SYS
BL specifies which program handles the call, BH is the function number
SeeAlso: AX=D201h/BX=4849h
--------O-2F12FFBX0007-----------------------
INT 2F U - Novell DOS 7 - SCRIPT.EXE - GET ???
AX = 12FFh
BX = 0007h
CX = 0000h
Return: CF clear if installed
AX = 0000h
BX = ??? (4426h)
CX = ??? (0068h)
DX = PSP segment of resident code???
SI = ??? (4AFAh)
ES = resident code segment
--------m-2F12FFBX0106-----------------------
INT 2F U - Novell DOS 7 - EMM386.EXE - GET VERSION???
AX = 12FFh
BX = 0106h
Return: CF clear if successful
AX = 0000h (successful)
BX = EDC0h (signature)
CL = memory manager variant (02h,03h)
(02h when DPMI/VCPI disabled, 03h when DPMI/VCPI loaded)
CH = ??? (00h)
DX = version??? (0300h for v3.0)
ES = segment of EMM386 low-memory stub
Notes: BL specifies which program handles the call, BH is the function number
if the word at ES:0012h is nonzero, if contains the offset within
segment ES of the CEMM-compatible entry point (see #1402)
if no other program has hooked INT 67, an alternate installation
check is to test for the string
"NOVELL EXPANDED MEMORY MANAGER 386" at offset 14h in the INT 67
handler's segment; the word immediately preceding this string
contains the offset of the API entry point if it is nonzero
Index: entry point;Novell EMM386
(Table 1402)
Call Novell EMM386.EXE entry point with:
AH = 00h get memory manager's status???
???
AH = 01h set memory manager's status???
???
AH = 02h Weitek coprocessor support???
AL = subfunction???
more functions???
SeeAlso: #0733 at INT 21/AX=4402h/SF=02h,#2271 at INT 67/AX=FFA5h
--------m-2F12FFBL06-------------------------
INT 2F U - Novell DOS 7 - EMM386.EXE - ???
AX = 12FFh
BL = 06h
BH = function (02h-09h)
???
Return: ???
--------O-2F12FFBX0EDC-----------------------
INT 2F U - Novell DOS 7 - EMM386.EXE - CHECK IF MULTITASKING SUPPORT LOADED???
AX = 12FFh
BX = 0EDCh
Return: AX = 0000h if ??? loaded
CF clear
BX = 0000h
Notes: called by Novell DOS 7 TaskMgr
if this function returns with AX=0000h, then the code necessary to
support the API on INT 2F/AX=2780h is loaded and that API becomes
available for use
because the request is handled on the initial trap to the memory
manager caused by INT instructions, this function must be invoked
with an actual INT 2F instruction instead of some simulation such
as a far call to the address in the interrupt vector table
SeeAlso: AX=2780h/CL=01h,AX=2780h/CL=02h,AX=2780h/CL=03h,AX=2780h/CL=04h
--------D-2F13-------------------------------
INT 2F U - DOS 3.2+ - SET DISK INTERRUPT HANDLER
AH = 13h
DS:DX -> interrupt handler disk driver calls on read/write
ES:BX = address to restore INT 13 to on system halt (exit from root
shell) or warm boot (INT 19)
Return: DS:DX set by previous invocation of this function
ES:BX set by previous invocation of this function
Notes: IO.SYS hooks INT 13 and inserts one or more filters ahead of the
original INT 13 handler. The first is for disk change detection
on floppy drives, the second is for tracking formatting calls and
correcting DMA boundary errors, the third is for working around
problems in a particular version of IBM's ROM BIOS
before the first call, ES:BX points at the original BIOS INT 13; DS:DX
also points there unless IO.SYS has installed a special filter for
hard disk reads (on systems with model byte FCh and BIOS date
"01/10/84" only), in which case it points at the special filter
most DOS 3.2+ disk access is via the vector in DS:DX, although a few
functions are still invoked via an INT 13 instruction
this is a dangerous security loophole for any virus-monitoring software
which does not trap this call ("INT13", "Nomenklatura", and many
Bulgarian viruses are known to use it to get the original ROM entry
point)
SeeAlso: INT 13/AH=01h,INT 19,INT 9D"VIRUS"
--------N-2F13-------------------------------
INT 2F U - MS-NET - ???
AH = 13h
???
Return: ???
Note: supposedly used to move (or control the movement of) NCBs
--------U-2F1400-----------------------------
INT 2F C - NLSFUNC.COM - INSTALLATION CHECK
AX = 1400h
Return: AL = 00h not installed, OK to install
01h not installed, not OK
FFh installed
Notes: this function is called by the DOS v3.3+ kernel
supported by OS/2 v1.3+ compatibility box, which always returns AL=FFh
supported by DR-DOS 5.0
documented for MS-DOS 5+, but undocumented in prior versions
SeeAlso: AX=1401h"NLSFUNC",AX=1402h"NLSFUNC"
--------D-2F1400-----------------------------
INT 2F - European MS-DOS 4.0 POPUP - "CheckPu" - INSTALLATION CHECK
AX = 1400h
Return: AX = FFFFh if installed
BX = maximum memory required to save screen and keyboard info
CF clear if successful
CF set on error
AX = error code
0002h invalid function
0004h unknown error
Note: the POPUP interface is used by background programs (see INT 21/AH=80h)
to communicate with the user
SeeAlso: AX=1401h"POPUP",AX=1402h"POPUP",AX=1403h"POPUP"
--------U-2F1401-----------------------------
INT 2F CU - NLSFUNC.COM - CHANGE CODE PAGE
AX = 1401h
DS:SI -> internal code page structure (see #1403)
BX = new code page (see #0962 at INT 21/AX=6602h)
DX = country code???
Return: AL = status
00h successful
else DOS error code
Note: this function is called by the DOS v3.3+ kernel
SeeAlso: AX=1400h"NLSFUNC",AX=1402h"NLSFUNC",INT 21/AH=66h
Format of DOS 3.30 internal code page structure:
Offset Size Description (Table 1403)
00h 8 BYTEs ???
08h 64 BYTEs name of country information file
48h WORD system code page
4Ah WORD number of supported subfunctions
4Ch 5 BYTEs data to return for INT 21/AX=6502h
51h 5 BYTEs data to return for INT 21/AX=6504h
56h 5 BYTEs data to return for INT 21/AX=6505h
5Bh 5 BYTEs data to return for INT 21/AX=6506h
60h 41 BYTEs data to return for INT 21/AX=6501h
--------D-2F1401-----------------------------
INT 2F - European MS-DOS 4.0 POPUP - "PostPu" - OPEN/CLOSE POPUP SCREEN
AX = 1401h
DL = function (00h open, 01h close)
DH = wait flag
00h block until screen opens
01h return error if screen is not available
02h urgent--always open screen immediately
Return: CF clear if successful
BX = amount of memory needed to save screen and keyboard info,
0000h if default save location can be used (only if DH was 02h)
CF set on error
Note: the application using the screen is frozen until the popup screen is
closed
SeeAlso: AX=1400h"POPUP",AX=1402h"POPUP",AX=1403h"POPUP"
--------U-2F1402-----------------------------
INT 2F CU - NLSFUNC.COM - GET EXTENDED COUNTRY INFO
AX = 1402h
BP = subfunction (same as AL for INT 21/AH=65h)
BX = code page (see #0962 at INT 21/AX=6602h)
DX = country code (see #0625 at INT 21/AH=38h)
DS:SI -> internal code page structure (see #1403)
ES:DI -> user buffer
CX = size of user buffer
Return: AL = status
00h successful
else DOS error code
Notes: this function is called by the DOS v3.3+ kernel on INT 21/AH=65h
code page structure apparently only needed for COUNTRY.SYS pathname
SeeAlso: AX=1401h"NLSFUNC",AX=1403h"NLSFUNC",AX=1404h,INT 21/AH=65h
--------D-2F1402-----------------------------
INT 2F - European MS-DOS 4.0 POPUP - "SavePu" - SAVE POPUP SCREEN
AX = 1402h
ES:DI -> save buffer (0000h:0000h for default buffer in POPUP)
Return: CF clear if successful
CF set on error
AX = error code (see #1404)
SeeAlso: AX=1400h"POPUP",AX=1401h"POPUP",AX=1403h"POPUP"
(Table 1404)
Values for POPUP error code:
0001h process does not own screen
0004h unknown error
0005h invalid pointer
--------U-2F1403-----------------------------
INT 2F CU - NLSFUNC.COM - SET CODE PAGE
AX = 1403h
DS:SI -> internal code page structure (see #1403)
BX = code page (see #0962 at INT 21/AX=6602h)
DX = country code (see #0625 at INT 21/AH=38h)
Return: AL = status
???
Note: this function is called by the DOS v3.3+ kernel on INT 21/AH=38h
SeeAlso: AX=1402h"NLSFUNC",AX=1404h,INT 21/AH=38h"SET"
--------D-2F1403-----------------------------
INT 2F - European MS-DOS 4.0 POPUP - "RestorePu" - RESTORE SCREEN
AX = 1403h
ES:DI -> buffer containing saved screen
(0000h:0000h for default buffer in POPUP)
Return: CF clear if successful
CF set on error
AX = error code (see #1404)
SeeAlso: AX=1400h"POPUP",AX=1401h"POPUP",AX=1402h"POPUP"
--------U-2F1404-----------------------------
INT 2F CU - NLSFUNC.COM - GET COUNTRY INFO
AX = 1404h
BX = code page (see #0962 at INT 21/AX=6602h)
DX = country code (see #0625 at INT 21/AH=38h)
DS:SI -> internal code page structure (see #1403)
ES:DI -> user buffer
Return: AL = status
???
Notes: this function is called by the DOS v3.3+ kernel on INT 21/AH=38h
code page structure apparently only needed for COUNTRY.SYS pathname
SeeAlso: AX=1402h,AX=1403h,INT 21/AH=38h"GET"
--------U-2F14FE-----------------------------
INT 2F U - DR-DOS 5.0 NLSFUNC - GET EXTENDED COUNTRY INFORMATION
AX = 14FEh
BX = code page (FFFFh=global code page) (see #0962 at INT 21/AX=6602h)
DX = country ID (FFFFh=current country) (see #0625 at INT 21/AH=38h)
ES:DI -> country information buffer
CL = info ID
01h get general internationalization info
02h get pointer to uppercase table
04h get pointer to filename uppercase table
05h get pointer to filename terminator table
06h get pointer to collating sequence table
07h get pointer to Double-Byte Character Set table
CF set (used to return error if not installed)
Return: CF clear if successful
DS:SI -> requested information
CF set on error
Notes: DR-DOS 5.0 NLSFUNC returns CF set and AX=0001h if AL was not 00h, FEh,
or FFh on entry.
the DR-DOS kernel calls this function on INT 21/AX=6501h
the value in CL is not range-checked by the DR-DOS 5.0 NLSFUNC
SeeAlso: #1405,AX=14FFh,INT 21/AH=65h
Format of DR-DOS COUNTRY.SYS file:
Offset Size Description (Table 1405)
00h 126 BYTEs copyright notice (terminated with Ctrl-Z, padded with NULs)
7Eh WORD signature EDC1h
80h var country pointer records
Offset Size Description
00h WORD country code (0000h if end of array)
02h WORD code page
04h WORD ??? (0000h)
06h 7 WORDs offsets in file for data tables for subfunctions
01h-07h
var var country information
--------U-2F14FF-----------------------------
INT 2F U - DR-DOS 5.0 NLSFUNC - PREPARE CODE PAGE
AX = 14FFh
BX = code page
Return: AX = ???
ZF set if AX=0000h
Notes: DR-DOS 5.0 NLSFUNC returns CF set and AX=0001h if AL was not 00h, FEh,
or FFh on entry.
passes codepage preparation request to each character device supporting
the generic IOCTL call
SeeAlso: AX=14FEh,INT 21/AX=440Ch,INT 21/AX=6602h
--------U-2F1500-----------------------------
INT 2F - DOS 4.00 GRAPHICS.COM - INSTALLATION CHECK
AX = 1500h
Return: AX = FFFFh
ES:DI -> ??? (graphics data?)
Note: this installation check conflicts with the CD-ROM Extensions
installation check; moved to AX=AC00h in later versions
SeeAlso: AX=AC00h
--------d-2F1500BX0000-----------------------
INT 2F - CD-ROM - INSTALLATION CHECK
AX = 1500h
BX = 0000h
Return: BX = number of CD-ROM drive letters used
CX = starting drive letter (0=A:)
Notes: this installation check DOES NOT follow the format used by other
software
this installation check conflicts with the DOS 4.00 GRAPHICS.COM
installation check
SeeAlso: INT 2F/AX=D000h/BX=4D44h"Lotus"
--------c-2F1500CH90-------------------------
INT 2F U - CDBLITZ v2.11 - INSTALLATION CHECK
AX = 1500h
CH = 90h (function number)
BX = 1234h (magic value for CDBLITZ)
Return: CX = 1234h if installed
CF clear
DX = BCD version number (DH = major, DL = minor)
Program: CDBLITZ is a CD-ROM cache by Blitz 'n' Software, Inc.
SeeAlso: AX=1500h/CH=99h
--------c-2F1500CH91-------------------------
INT 2F U - CDBLITZ v2.11 - GET STATISTICS
AX = 1500h
CH = 91h (function number)
BX = 1234h (magic value for CDBLITZ)
Return: CF clear
ES:BX -> statistics record (see #1406)
SeeAlso: AX=1500h/CH=90h,AX=1500h/CH=97h
Format of CDBLITZ statistics record:
Offset Size Description (Table 1406)
00h WORD cache mode (see also AX=1500h/CH=94h)
0001h 'min', 0002h 'max'
02h DWORD number of read calls???
06h DWORD total number of sectors read
0Ah DWORD unused??? (zero)
0Eh DWORD number of cache hit sectors
12h WORD cache size in KB
14h WORD unused??? (zero)
16h WORD cache state (0000h disabled, 0001h enabled)
--------c-2F1500CH92-------------------------
INT 2F U - CDBLITZ v2.11 - ENABLE CACHE
AX = 1500h
CH = 92h (function number)
BX = 1234h (magic value for CDBLITZ)
Return: CF clear
SeeAlso: AX=1500h/CH=90h,AX=1500h/CH=93h,AX=1500h/CH=94h
--------c-2F1500CH93-------------------------
INT 2F U - CDBLITZ v2.11 - DISABLE CACHE
AX = 1500h
CH = 93h (function number)
BX = 1234h (magic value for CDBLITZ)
Return: CF clear
SeeAlso: AX=1500h/CH=90h,AX=1500h/CH=92h,AX=1500h/CH=95h
--------c-2F1500CH94-------------------------
INT 2F U - CDBLITZ v2.11 - SET 'MAX' MODE (CACHE BOTH DIRECTORIES AND DATA)
AX = 1500h
CH = 94h (function number)
BX = 1234h (magic value for CDBLITZ)
Return: CF clear
SeeAlso: AX=1500h/CH=90h,AX=1500h/CH=92h,AX=1500h/CH=95h
--------c-2F1500CH95-------------------------
INT 2F U - CDBLITZ v2.11 - SET 'MIN' MODE (CACHE ONLY DIRECTORY ENTRIES)
AX = 1500h
CH = 95h (function number)
BX = 1234h (magic value for CDBLITZ)
Return: CF clear
SeeAlso: AX=1500h/CH=90h,AX=1500h/CH=94h
--------c-2F1500CH96-------------------------
INT 2F U - CDBLITZ v2.11 - FLUSH CACHE
AX = 1500h
CH = 96h (function number)
BX = 1234h (magic value for CDBLITZ)
Return: CF clear
Note: this function resets the counts for number of sectors read and number
of cache hits, but no other values in the statistics record
(see #1406)
SeeAlso: AX=1500h/CH=90h
--------c-2F1500CH97-------------------------
INT 2F U - CDBLITZ v2.11 - GET CACHE STATISTICS
AX = 1500h
CH = 97h (function number)
BX = 1234h (magic value for CDBLITZ)
Return: CF clear
AL = cache mode (01h 'min', 02h 'max') (see also AX=1500h/CH=94h)
AH = cache state (00h disabled, 01h enabled)
BX = cache size in KB
DX:CX = total number of reads
DI:SI = number of cache hits
SeeAlso: AX=1500h/CH=90h,AX=1500h/CH=91h
--------c-2F1500CH99-------------------------
INT 2F U - CDBLITZ v2.11 - UNINSTALL
AX = 1500h
CH = 99h (function number)
BX = 1234h (magic value for CDBLITZ)
Return: CF clear
???
Program: CDBLITZ is a CD-ROM cache by Blitz 'n' Software, Inc.
SeeAlso: AX=1500h/CH=90h
--------d-2F1501-----------------------------
INT 2F - CD-ROM - GET DRIVE DEVICE LIST
AX = 1501h
ES:BX -> buffer to hold drive letter list (5 bytes per drive letter)
Return: buffer filled, for each drive letter
BYTE subunit number in driver
DWORD address of device driver header
--------d-2F1502-----------------------------
INT 2F - CD-ROM - GET COPYRIGHT FILE NAME
AX = 1502h
ES:BX -> 38-byte buffer for name of copyright file
CX = drive number (0=A:)
Return: CF set if drive is not a CD-ROM drive
AX = 000Fh (invalid drive)
CF clear if successful
SeeAlso: AX=1503h
--------d-2F1503-----------------------------
INT 2F - CD-ROM - GET ABSTRACT FILE NAME
AX = 1503h
ES:BX -> 38-byte buffer for name of abstract file
CX = drive number (0=A:)
Return: CF set if drive is not a CD-ROM drive
AX = 000Fh (invalid drive)
CF clear if successful
SeeAlso: AX=1502h,AX=1504h
--------d-2F1504-----------------------------
INT 2F - CD-ROM - GET BIBLIOGRAPHIC DOC FILE NAME
AX = 1504h
ES:BX -> 38-byte buffer for name of bibliographic documentation file
CX = drive number (0=A:)
Return: CF set if drive is not a CD-ROM drive
AX = 000Fh (invalid drive)
CF clear if successful
SeeAlso: AX=1502h,AX=1503h
--------d-2F1505-----------------------------
INT 2F - CD-ROM - READ VTOC
AX = 1505h
ES:BX -> 2048-byte buffer
CX = drive number (0=A:)
DX = sector index (0=first volume descriptor,1=second,...)
Return: CF set on error
AX = error code (15=invalid drive,21=not ready)
CF clear if successful
AX = volume descriptor type (1=standard,FFh=terminator,0=other)
--------d-2F1506-----------------------------
INT 2F - CD-ROM - TURN DEBUGGING ON
AX = 1506h
BX = debugging function to enable
Note: reserved for development
SeeAlso: AX=1507h
--------d-2F1507-----------------------------
INT 2F - CD-ROM - TURN DEBUGGING OFF
AX = 1507h
BX = debugging function to disable
Note: reserved for development
SeeAlso: AX=1506h
--------d-2F1508-----------------------------
INT 2F - CD-ROM - ABSOLUTE DISK READ
AX = 1508h
ES:BX -> buffer
CX = drive number (0=A:)
SI:DI = starting sector number
DX = number of sectors to read
Return: CF set on error
AL = error code (15=invalid drive,21=not ready)
CF clear if successful
SeeAlso: AX=1509h
--------d-2F1509-----------------------------
INT 2F - CD-ROM - ABSOLUTE DISK WRITE
AX = 1509h
ES:BX -> buffer
CX = drive number (0=A:)
SI:DI = starting sector number
DX = number of sectors to write
Note: corresponds to INT 26h and is currently reserved and nonfunctional
SeeAlso: AX=1508h
--------d-2F150A-----------------------------
INT 2F - CD-ROM - RESERVED
AX = 150Ah
--------d-2F150B-----------------------------
INT 2F - CD-ROM v2.00+ - DRIVE CHECK
AX = 150Bh
CX = drive number (0=A:)
Return: BX = ADADh if MSCDEX.EXE installed
AX = support status
0000h if drive not supported
nonzero if supported
SeeAlso: AX=150Dh
--------d-2F150C-----------------------------
INT 2F - CD-ROM v2.00+ - GET MSCDEX.EXE VERSION
AX = 150Ch
Return: BH = major version
BL = minor version
Note: MSCDEX.EXE versions prior to 2.00 return BX=0
--------d-2F150D-----------------------------
INT 2F - CD-ROM v2.00+ - GET CD-ROM DRIVE LETTERS
AX = 150Dh
ES:BX -> buffer for drive letter list (1 byte per drive)
Return: buffer filled with drive numbers (0=A:). Each byte corresponds
to the drive in the same position for function 1501h
SeeAlso: AX=150Bh
--------d-2F150E-----------------------------
INT 2F - CD-ROM v2.00+ - GET/SET VOLUME DESCRIPTOR PREFERENCE
AX = 150Eh
BX = subfunction
00h get preference
DX = 0000h
Return: DX = preference settings
01h set preference
DH = volume descriptor preference
01h = primary volume descriptor
02h = supplementary volume descriptor
DL = supplementary volume descriptor preference
01h = shift-Kanji
CX = drive number (0=A:)
Return: CF set on error
AX = error code (15=invalid drive,1=invalid function)
CF clear if successful
--------d-2F150F-----------------------------
INT 2F - CD-ROM v2.00+ - GET DIRECTORY ENTRY
AX = 150Fh
CL = drive number (0=A:)
CH bit 0 = copy flag
clear if direct copy
set if copy to structure which removes ISO/High Sierra diffs
ES:BX -> ASCIZ path name
SI:DI -> buffer for directory entry (see #1407,#1408)
minimum 255 bytes for direct copy
Return: CF set on error
AX = error code
CF clear if successful
AX = disk format (0=High Sierra,1=ISO 9660)
Format of CD-ROM directory entry (direct copy):
Offset Size Description (Table 1407)
00h BYTE length of directory entry
01h BYTE length of XAR in Logical Block Numbers
02h DWORD LBN of data, Intel (little-endian) format
06h DWORD LBN of data, Motorola (big-endian) format
0Ah DWORD length of file, Intel format
0Eh DWORD length of file, Motorola format
---High Sierra---
12h 6 BYTEs date and time
18h BYTE bit flags
19h BYTE reserved
---ISO 9660---
12h 7 BYTEs date and time
19h BYTE bit flags
---both formats---
1Ah BYTE interleave size
1Bh BYTE interleave skip factor
1Ch WORD volume set sequence number, Intel format
1Eh WORD volume set sequence number, Motorola format
20h BYTE length of file name
21h N BYTEs file name
BYTE (optional) padding if filename is odd length
N BYTEs system data
SeeAlso: #1408
Format of CD-ROM directory entry (canonicalized):
Offset Size Description (Table 1408)
00h BYTE length of XAR in Logical Block Numbers
01h DWORD Logical Block Number of file start
05h WORD size of disk in logical blocks
07h DWORD file length in bytes
0Bh 7 BYTEs date and time
12h BYTE bit flags
13h BYTE interleave size
14h BYTE interleave skip factor
15h WORD volume set sequence number
17h BYTE length of file name
18h 38 BYTEs ASCIZ filename
3Eh WORD file version number
40h BYTE number of bytes of system use data
41h 220 BYTEs system use data
SeeAlso: #1407
--------d-2F1510-----------------------------
INT 2F - CD-ROM v2.10+ - SEND DEVICE DRIVER REQUEST
AX = 1510h
CX = CD-ROM drive letter (0 = A, 1 = B, etc)
ES:BX -> CD-ROM device driver request header (see #1382 at AX=0802h)
--------W-2F1600-----------------------------
INT 2F - MS Windows - WINDOWS ENHANCED MODE INSTALLATION CHECK
AX = 1600h
Return: AL = status
00h neither Windows 3.x enhanced mode nor Windows/386 2.x running
01h Windows/386 2.x running
80h XMS version 1 driver installed (neither Windows 3.x enhanced
mode nor Windows/386 2.x running) (obsolete--see note)
FFh Windows/386 2.x running
AL = anything else
AL = Windows major version number >= 3
AH = Windows minor version number
Notes: INT 2F/AH=16h comprises an API for non-Windows programs (DOS device
drivers, TSRs, and applications) to cooperate with multitasking
Windows/386 2.x and Windows 3.x and higher enhanced mode.
certain calls are also supported in the Microsoft 80286 DOS extender in
Windows standard mode
this function served as the installation check and AX=1610h served to
get the driver entry point for XMS version 1, which is now obsolete.
Use AX=4300h and AX=4310h instead
SeeAlso: AX=160Ah,AX=1610h,AX=4300h,AX=4680h
Index: installation check;XMS version 1
--------W-2F1602-----------------------------
INT 2F - MS Windows/386 2.x - GET API ENTRY POINT
AX = 1602h
Return: ES:DI -> Windows/386 2.x API procedure entry point
Notes: this interface is supported in Windows 3.x only for 2.x compatibility
to get the current virtual machine (VM) ID in Windows/386 2.x:
AX = 0000h
ES:DI -> return address
JUMP to address returned from INT 2F/AX=1602h
After JUMP, at return address:
BX = current VM ID.
SeeAlso: AX=C020h
--------W-2F1603-----------------------------
INT 2F - MS Windows/386 - GET INSTANCE DATA
AX = 1603h
Return: AX = 5248h ('RH') if supported
DS:SI -> Windows/386 instance data (see #1409)
Notes: reportedly supported by RM Nimbus MS-DOS 3.3 kernel
this function is called by DOSMGR when AX=1607h/BX=0015h is not
supported, as is the case in DOS versions prior to 5.0
see Geoff Chappell's book _DOS_Internals_ for additional discussions of
this function, DOSMGR's behavior, and instancing in general
SeeAlso: AX=1607h/BX=0015h
Format of Windows/386 instance data:
Offset Size Description (Table 1409)
00h WORD segment of IO.SYS (0000h = default 0070h)
02h WORD offset in IO.SYS of STACKS data structure (DOS 3.2x)
0000h if not applicable
04h WORD number of instance data entries (max 32)
06h Array of instance data entries
Offset Size Description
00h WORD segment (0002h = DOS kernel)
02h WORD offset
04h WORD size
--------W-2F1605-----------------------------
INT 2F - MS Windows - WINDOWS ENHANCED MODE & 286 DOSX INIT BROADCAST
AX = 1605h
ES:BX = 0000h:0000h
DS:SI = 0000h:0000h
CX = 0000h
DX = flags
bit 0 = 0 if Windows enhanced-mode initialization
bit 0 = 1 if Microsoft 286 DOS extender initialization
bits 1-15 reserved (undefined)
DI = version number (major in upper byte, minor in lower)
Return: CX = 0000h if okay for Windows to load
CX = FFFFh (other registers unchanged) if Windows 3.0 in standard mode
CX <> 0 if Windows should not load
ES:BX -> startup info structure (see #1410)
DS:SI -> virtual86 mode enable/disable callback or 0000h:0000h
(see #1413)
Notes: the Windows enhanced mode loader and Microsoft 286 DOS extender will
broadcast an INT 2F/AX=1605h call when initializing. Any DOS device
driver or TSR can watch for this broadcast and return the appropriate
values. If the driver or TSR returns CX <> 0, it is also its
responsibility to display an error message.
each handler must first chain to the prior INT 2F handler with
registers unchanged before processing the call
if the handler requires local data on a per-VM basis, it must store the
returned ES:BX in the "next" field of a startup info structure and
return a pointer to that structure in ES:BX
a single TSR may set the V86 mode enable/disable callback; if DS:SI is
already nonzero, the TSR must fail the initialization by setting CX
nonzero
MSD checks for Windows 3.0 running in standard mode by testing whether
CX=FFFFh and other registers are unchanged on return
Novell DOS v7.0 (Update 8 - Update 11) TASKMGR in multitasking mode
uses this broadcast, even if TASKMGR.INI sets WinPresent= to OFF
Micrsoft's EMM386.EXE for DOS 5+ when installed with the NOEMS option
changes its driver name from EMMQXXX0 to EMMXXXX0 while Windows is
active
SeeAlso: AX=1606h,AX=1608h,AX=4B05h
Format of Windows Startup Information Structure:
Offset Size Description (Table 1410)
00h 2 BYTEs major, minor version of info structure
02h DWORD pointer to next startup info structure or 0000h:0000h
06h DWORD pointer to ASCIZ name of virtual device file or 0000h:0000h
0Ah DWORD virtual device reference data (see #1412)
(only used if above nonzero)
0Eh DWORD pointer to instance data records (see #1411) or 0000h:0000h
Format of one Instance Item in array:
Offset Size Description (Table 1411)
00h DWORD address of instance data (end of array if 0000h:0000h)
04h WORD size of instance data
Format of Virtual Device Reference Data:
Offset Size Description (Table 1412)
00h DWORD physical address of ??? or 00000000h
04h DWORD physical address of ??? table
08h DWORD "DEST_PAGE" address to which pages must be mapped
0Ch N DWORDs "SRC_PAGE" physical addresses of the pages
00000000h = end of table
Note: EMM386.EXE sets the first pointer to the start of the device driver
chain, the second pointer to a field of 40h bytes followed by a
16-bit offset to the end of the SRC_PAGE table, and DEST_PAGE to
the start segment of the UMB area
(Table 1413)
Values Windows virtual mode enable/disable procedure is called with:
AX = 0000h disable V86 mode
AX = 0001h enable V86 mode
interrupts disabled
Return: CF set on error
CF clear if successful
interrupts disabled
--------W-2F1606-----------------------------
INT 2F - MS Windows - WINDOWS ENHANCED MODE & 286 DOSX EXIT BROADCAST
AX = 1606h
DX = flags
bit 0 = 0 if Windows enhanced-mode exit
bit 0 = 1 if Microsoft 286 DOS extender exit
bits 1-15 reserved (undefined)
Notes: if the init broadcast fails (AX=1605h returned CX <> 0), then this
broadcast will be issued immediately.
this call will be issued in real mode
Novell DOS v7.0 (Update 8 - Update 10) TASKMGR in multitasking mode
uses this broadcast, even if TASKMGR.INI sets Win31Present= to OFF
SeeAlso: AX=1605h,AX=1609h
--------W-2F1607-----------------------------
INT 2F - MS Windows - VIRTUAL DEVICE CALL OUT API
AX = 1607h
BX = virtual device ID (see #1419)
CX = (usually) callout subfunction
Return: (usually) AX,BX,CX,DX,ES contain results
Notes: more of a convention than an API, this call specifies a standard
mechanism for Windows enhanced-mode virtual devices (VxD's) to talk
to DOS device drivers and TSRs
see below for details on several virtual devices
SeeAlso: AX=1605h,AX=1607h/BX=000Ch,AX=1607h/BX=0014h,AX=1607h/BX=0015h
SeeAlso: AX=1607h/BX=0018h,AX=1684h,AX=C020h
--------W-2F1607BX0006-----------------------
INT 2F - MS Windows - "V86MMGR" VIRTUAL DEVICE API
AX = 1607h
BX = 0006h (VxD identifier of "V86MMGR")
CX = 0000h
Return: AX = status
0000h if local A20 state changed
1607h if A20 unchanged
other if global A20 state changed
--------W-2F1607BX000C-----------------------
INT 2F - MS Windows - "VMD" VIRTUAL MOUSE DEVICE API
AX = 1607h
BX = 000Ch (VxD identifier of "VMD")
Return: CX = nonzero if mouse driver already virtualized
Note: VMD (Virtual Mouse Driver) calls this and then checks whether CX is
nonzero; if yes, it will not automatically virtualize the mouse
driver. This would be used if MOUSE.COM already virtualizes
itself using the Windows API.
SeeAlso: AX=1607h/BX=0014h,AX=1607h/BX=0015h
----------2F1607BX0010-----------------------
INT 2F C - MS Windows 3.1 - "BLOCKDEV" VIRTUAL HARD DISK DEVICE API
AX = 1607h
BX = 0010h (VxD identifier of "BLOCKDEV")
CX = function
0001h starting FastDisk compatibility tests
0002h ending FastDisk compatibility tests
0003h check if FastDisk installation allowed
Return: CX = 0000h if allowed
Note: this interface is called by the Windows FastDisk driver (such as
WDCTRL) when it thinks that the INT 13h handler immediately below
IO.SYS's INT 13h code is not in ROM; it should be supported by any
program which hooks itself underneath IO.SYS's INT 13h code with
INT 2F/AH=13h
SeeAlso: AX=1607h/BX=0014h,INT 2F/AH=13h
--------W-2F1607BX0014-----------------------
INT 2F - MS Windows - "VNETBIOS" VIRTUAL DEVICE API
AX = 1607h
BX = 0014h (VxD identifier of "VNETBIOS")
Return: ES:DI -> 128-byte table specifying VNETBIOS actions for each NetBIOS
command code (see #1414)
Note: VNETBIOS (Virtual NetBIOS) calls this function to determine whether
the NetBIOS has an extensions Windows should know about
SeeAlso: AX=1607h/BX=000Ch,AX=1607h/BX=0010h,AX=1607h/BX=0015h
(Table 1414)
Values for VNETBIOS action code:
00h "VN_Unknown" unknown command
04h "VN_No_Map" no memory mapping necessary
08h "VN_Map_In" input buffer is quickly used, so no global mapping needed
0Ch "VN_Map_In" output buffer is quickly used, so no global mapping needed
10h "VN_Map_In_Out" buffer is quickly used, so no global mapping needed
14h "VN_Chain_Send" the chain-send command
18h "VN_Cancel" special case for cancel command
1Ch "VN_Buffer_In" buffer is incoming
20h "VN_Buffer_Out" buffer is outgoing
24h "VN_Buffer_In_Out" buffer used for both incoming and outgoing data
--------D-2F1607BX0015-----------------------
INT 2F C - MS Windows - "DOSMGR" VIRTUAL DEVICE API
AX = 1607h
BX = 0015h (VxD identifier of "DOSMGR")
CX = function
0000h query instance processing
DX = 0000h
Return: CX = state
0000h not instanced
other instanced (DOS 5+ kernel returns 0001h)
DX = segment of DOS drivers or 0000h for
default of 0070h
ES:BX -> patch table (see #1416)
0001h set patches in DOS
DX = bit mask of patch requests (see #1415)
Return: AX = B97Ch
BX = bit mask of patches applied (see #1415)
DX = A2ABh
0002h remove patches in DOS (ignored by DOS 5.0 kernel)
DX = bit mask of patch requests (see function 0001h)
Return: CX = 0000h (DOS 5-6)
Note: return values are ignored by DOSMGR in Windows 3.1
0003h get size of DOS data structures
DX = bit mask of request (only one bit can be set)
bit 0: Current Directory Structure size
Return: if supported request:
AX = B97Ch
CX = size in bytes of requested structure
DX = A2ABh
else:
CX = 0000h
all other registers preserved
0004h determine instanced data structures
Return: AX = B97Ch if supported
DX = A2ABh if supported (DOS 5+ kernel returns 0000h)
BX = bit mask of instanced items
bit 0: CDS
bit 1: SFT
bit 2: device list
bit 3: DOS swappable data area
0005h get device driver size
ES = segment of device driver
Return: DX:AX = 0000h:0000h on error (not dev. driver segment)
DX:AX = A2ABh:B97Ch if successful
BX:CX = size of device driver in bytes
Notes: DOSMGR (DOS Manager) will check whether the OEM DOS/BIOS data has
been instanced via this API and will not perform its own default
instancing of the normal DOS/BIOS data if so; if this API is not
supported, DOSMGR will also try to access instancing data through
INT 2F/AX=1603h
these functions are supported by the DOS 5+ kernel; DOSMGR contains
tables of instancing information for earlier versions of DOS
see Geoff Chappell's book _DOS_Internals_ for additional discussions of
DOSMGR's behavior and instancing in general
SeeAlso: AX=1603h,AX=1605h,AX=1607h/BX=000Ch,AX=1607h/BX=0014h,AX=1684h
Bitfields for DOSMGR patch requests:
Bit(s) Description (Table 1415)
0 enable critical sections
1 NOP setting/checking user ID
2 turn INT 21/AH=3Fh on STDIN into polling loop
3 trap stack fault in "SYSINIT" to WIN386
4 BIOS patch to trap "Insert disk X:" to WIN386
Format of DOSMGR patch table:
Offset Size Description (Table 1416)
00h 2 BYTEs DOS version (major, minor)
02h WORD offset in DOS data segment of "SAVEDS"
04h WORD offset in DOS data segment of "SAVEBX"
06h WORD offset in DOS data segment of InDOS flag
08h WORD offset in DOS data segment of User ID word
0Ah WORD offset in DOS data segment of "CritPatch" table to enable
critical section calls (see INT 2A/AH=80h)
0Ch WORD (DOS 5+ only) offset in DOS data segment of "UMB_HEAD",
containing segment of last MCB in conventional memory
--------W-2F1607BX0018-----------------------
INT 2F C - MS Windows - "VMPoll" VIRTUAL DEVICE - IDLE CALLOUT
AX = 1607h
BX = 0018h (VMPoll VxD ID)
CX = 0000h
Return: AX = status
0000h if timeslice used
nonzero if timeslice not needed
Note: when VMPoll makes this callout, all virtual machines are idle
SeeAlso: AX=1607h
--------W-2F1607BX0021--------------------------------------
INT 2F C - MS Windows - "PageFile" VIRTUAL DEVICE - GET LOCK BYTE
AX = 1607h
BX = 0021h (PageFile VxD ID)
CX = 0000h
Return: AX = status
0000h success
ES:DI -> cache lock byte in disk cacher
other no disk cache or unsupported
Notes: PageFile issues this call on real-mode initialization in order to allow
disk caches to provide it with a byte which it can use to temporarily
lock the disk cache; VMPOLL also issues this call, so it is made
twice each time Windows starts up
if this call fails, PageFile falls back to other techniques for locking
the disk cache
SeeAlso: AX=1607h
--------E-2F1607BX22C0-----------------------
INT 2F - Rational Systems DOS/4GW - ???
AX = 1607h
BX = 22C0h
???
Return: ???
SeeAlso: INT 15/AX=BF02h,INT 15/AX=BF04h
--------W-2F1608-----------------------------
INT 2F C - MS Windows - WINDOWS ENHANCED MODE INIT COMPLETE BROADCAST
AX = 1608h
Notes: called after all installable devices have been initialized
real-mode software may be called between the Windows enhanced-mode init
call (AX=1605h) and this call; the software must detect this
situation
SeeAlso: AX=1605h,AX=1609h
--------W-2F1609-----------------------------
INT 2F C - MS Windows - WINDOWS ENHANCED MODE BEGIN EXIT BROADCAST
AX = 1609h
Note: called at the beginning of a normal exit sequence; not made in the
event of a fatal system crash
SeeAlso: AX=1606h,AX=1608h
--------W-2F160A-----------------------------
INT 2F - MS Windows 3.1 - IDENTIFY WINDOWS VERSION AND TYPE
AX = 160Ah
Return: AX = 0000h if call supported
BX = version (BH=major, BL=minor)
CX = mode (0002h = standard, 0003h = enhanced)
SeeAlso: AX=1600h,AX=4680h
--------W-2F160B-----------------------------
INT 2F - MS Windows 3.1 - IDENTIFY TSRs
AX = 160Bh
ES:DI -> communication structure (see #1417) or 0000h:0000h
Return: ES:DI -> communication structure
Desc: this call allows Windows-aware TSRs to make themselves known to
Windows.
Note: the TSR should allocate a communication structure, place the given
ES:DI pointer in the first field, and return a pointer to the new
structure
SeeAlso: AX=1605h,AX=160Ch,AX=4B01h,AX=4B05h
Format of TSR-to-Windows communication structure:
Offset Size Description (Table 1417)
00h DWORD pointer to next structure
04h WORD PSP segment
06h WORD API version ID (0100h)
08h WORD EXEC flags
bit 0: "WINEXEC"
bit 1: "LOADLIBRARY"
bit 2: "OPENDRIVER"
0Ah WORD "exec_cmd_show"
0Ch DWORD "exec_cmd"
10h 4 BYTEs reserved (0)
14h DWORD pointer to TSR ID block (see #1418)
18h DWORD pointer to TSR data block or 0000h:0000h
Format of Norton Utilities 6.0 TSR ID block:
Offset Size Description (Table 1418)
00h WORD length of name string
02h N BYTEs name of TSR's executable
--------W-2F160C-----------------------------
INT 2F - MS Windows 3.1 - DETECT ROMs
AX = 160Ch
???
Return: ???
Note: used by ROM Windows
SeeAlso: AX=160Bh
--------m-2F1610-----------------------------
INT 2F - XMS v1.x only - GET DRIVER ADDRESS
AX = 1610h
details unavailable
Note: this function and AX=1600h were only used in XMS version 1 and are now
obsolete. Use AX=4300h and AX=4310h instead
SeeAlso: AX=1600h,AX=4310h
--------W-2F1680-----------------------------
INT 2F - MS Windows, DPMI, various - RELEASE CURRENT VIRTUAL MACHINE TIME-SLICE
AX = 1680h
Return: AL = status
00h if the call is supported
80h (unchanged) if the call is not supported
Notes: programs can use this function in idle loops to enhance performance
under multitaskers; this call is supported by MS Windows 3.0, DOS 5+,
DPMI 1.0+, and in OS/2 2.0+ for multitasking DOS applications
does not block the program; it just gives up the remainder of the time
slice
should not be used by Windows-specific programs
when called very often without intermediate screen output under WIN 3+,
the VM will go into an idle-state and will not receive the next slice
before 8 seconds. This time can be changed in SYSTEM.INI through
"IdleVMWakeUpTime=
SeeAlso: INT 15/AX=1000h,INT 15/AX=5305h,INT 21/AH=89h,INT 7A/BX=000Ah
--------W-2F1681-----------------------------
INT 2F - MS Windows 3+ - BEGIN CRITICAL SECTION
AX = 1681h
Notes: used to prevent a task switch from occurring
should be followed by an INT 2F/AX=1682h call as soon as possible
nested calls are allowed, and must be followed by an appropriate number
of "end critical section" calls
not supported in Windows/386 2.x. Get INDOS flag with INT 21/AH=34h and
increment by hand.
SeeAlso: AX=1682h,INT 15/AX=101Bh,INT 21/AH=34h
--------W-2F1682-----------------------------
INT 2F - MS Windows 3+ - END CRITICAL SECTION
AX = 1682h
Notes: not supported in Windows/386 2.x. Get InDOS flag with INT 21/AH=34h
and decrement by hand, taking care not to decrement InDOS flag
through zero
SeeAlso: AX=1681h,INT 15/AX=101Ch,INT 21/AH=34h
--------W-2F1683-----------------------------
INT 2F - MS Windows 3+ - GET CURRENT VIRTUAL MACHINE ID
AX = 1683h
Return: BX = current virtual machine (VM) ID
Notes: Windows itself currently runs in VM 1, but this can't be relied upon
VM IDs are reused when VMs are destroyed
an ID of 0 will never be returned
SeeAlso: AX=1684h,AX=1685h,AX=168Bh
--------W-2F1684-----------------------------
INT 2F - MS Windows - GET DEVICE API ENTRY POINT
AX = 1684h
BX = virtual device (VxD) ID (see #1419)
ES:DI = 0000h:0000h
Return: ES:DI -> VxD API entry point, or 0:0 if the VxD does not support an API
Note: some Windows enhanced-mode virtual devices provide services that
applications can access. For example, the Virtual Display Device
(VDD) provides an API used in turn by WINOLDAP.
SeeAlso: AX=1683h
(Table 1419)
Values for MS Windows VxD ID:
Value Name CallOut V86 PM Description
0000h LPT N N N DOS386 LPT Device (Windows for Workgroups 3.11)
0000h MSODISUP N N N MS ODI Support (Windows for Workgroups 3.11)
0000h NWNBLINK N N N Netware NetBIOS (Windows for Workgroups 3.11)
0000h SERIAL N N N DOS386 Serial Device (Windows for Workgrp 3.11)
0001h VMM N N Virtual Machine Manager
0002h Debug
0003h VPICD Y Y Virtual Prog. Interrupt Controller (PIC) Device
0004h VDMAD N N Virtual Direct Memory Access (DMA) Device
0005h VTD Y Y Virtual Timer Device
0006h V86MMGR Y N N Virtual 8086 Mode Device
0007h PageSwap N N Paging Device
0008h Parity N N Parity-check trapper
0009h Reboot N Y Ctrl-Alt-Del handler
000Ah VDD N Y Virtual Display Device (GRABBER)
000Bh VSD N N Virtual Sound Device
000Ch VMD Y Y Y Virtual Mouse Device
000Dh VKD N Y Virtual Keyboard Device
000Eh VCD N Y Virtual COMM Device
000Fh VPD Virtual Printer Device
0010h VHD Virtual Hard Disk Device (Windows 3.0)
0010h BLOCKDEV N N Virtual Hard Disk Device (Windows 3.1)
0010h IOS N N N DOS386 IOS Device (Windows for Workgroups 3.11)
0010h IOS N Y (Chicago)
0011h VMCPD Y Y Virtual Math CoProcessor Device
0012h EBIOS N N Reserve EBIOS page (e.g., on PS/2)
0013h BIOSXLAT N N Map ROM BIOS API between prot & V86 mode
0014h VNETBIOS Y N N Virtual NetBIOS Device
0015h DOSMGR Y Y N DOS data instancing (see #1422)
0016h WINLOAD
0017h SHELL N Y
0018h VMPOLL N N
0019h VPROD
001Ah DOSNET N N assures network integrity across VMs
001Ah VNETWARE Y Y Novell NetWare DOSNET replacement
001Bh VFD N N Virtual Floppy Device
001Ch VDD2 Secondary display adapter
001Ch LoadHi N N Netroom LoadHi Device (RMLODHI.VXD)
001Ch LoadHi N N 386MAX LoadHi Device (386MAX.VXD)
001Ch LoadHi N N Win386 LoadHi Device (EMM386.EXE)
001Dh WINDEBUG N Y
001Dh TDDebug N Y
001Eh TSRLoad TSR instance utility
001Fh BiosHook BIOS interrupt hooker VxD
0020h Int13 N N N
0021h PageFile N Y Paging File device
0022h SCSI
0023h MCA_POS
0024h SCSIFD SCSI FastDisk device
0025h VPEND Pen device
0026h APM Advanced Power Management
0027h VXDLDR N Y Y VXDLDR (Windows for Workgroups 3.11)
0028h NDIS N Y Y Network Driver Interface Specification
(Windows for Workgroups 3.11)
002Ah VWIN32 N Y (Chicago)
002Bh VCOMM N Y Y DOS386 VCOMM Device (Windows for Workgrps 3.11)
002Dh W32S Y N Y WIN32s
0030h MACH32 N N Y ATI Mach32 video card
0031h NETBEUI N N N NETBEUI (Windows for Workgroups 3.11)
0032h SERVER N Y Y Int21 File Server (Windows for Workgroups 3.11)
0033h CONFIGMG Y Y (Chicago)
0033h EDOS N N Windows DOS Box Enhancer by Mom's Software
0034h DWCFGMG.SYS Plug-and-Play configuration manager
0036h VFBACKUP Y Y (Chicago)
0038h VCOND Y Y (Chicago)
003Ah VPMTD N N Y IFAX Scheduler Device (Windows for Workgr 3.11)
003Bh DSVXD Y N DoubleSpace VxD from MS-DOS v6.x
0051h ISAPNP N N
008Dh ESDI_506 N N (Chicago)
0090h voltrack N N
00FDh FAKEIDE N N (Chicago)
0102h CV1 N N Microsoft C/C++ 7.00+ CodeView for Windows
0200h VIPX Y Y NetWare Virtual IPX Driver
0201h VNWLSERV N N NetWare Lite 1.1 Server (SERVER.EXE)
0202h WINICE Y Y SoftICE/W
0203h VCLIENT N Y NetWare Lite 1.1+ Client
0205h VCAFT N N Novell Virtual CAFT Driver (LANalyzer for Win)
0205h BCW Y Y Nu-Mega Bounds Checker for Windows
0206h VTXRX N N Novell Virtual TXRX Driver (LANalyzer for Win)
0234h VCOMMUTE Y Y PC Tools Commute
0442h VTDAPI N Y MMSys Win386 VTAPI Device
0444h VADMAD Autoinitialize DMA (Windows 3.0)
0445h VSBD Y Y WinResKit: Sound Blaster Device
0446h VADLIBD Y Y Y MMSys Win386 AdLib Device (v3.x)
045Dh VflatD N Y dva.386, part of WIN32s
0460h UNIMODEM N Y
0480h VNetSup N Y Y Virtual Net Support (Windows for Workgrps 3.11)
0481h VRedir N N N Redirector File System Driver
(Windows for Workgroups 3.11)
0482h VBrowse Y Y Win386 Virtual Browser
0483h VSHARE N N Windows for Workgroups Virtual SHARE
0484h IFSMgr Y Y N Installable File System Manager
(Windows for Workgroups 3.11)
0486h VFAT N Y Y Win386 HPFS Driver (Windows for Workgrps 3.11)
0487h NWLINK Y Y Win386 Virtual Packet Exchange Protocol
0487h NWSUP Y N N NetWare Vnetbios shim
048Bh VCache N Y Y Virtual File Cache (Windows for Workgrps 3.11)
048Bh VCACHE Y Y
048Dh RASMAC Y Y enhanced mode Win4Workgroups RASMAC device
1021h VMB Y Y Microsoft C/C++ 7.00 WXSRVR
1022h Vpfd Y Y Microsoft C/C++ 7.00
1025h MMD Y Y Microsoft C/C++ 8.00, Visual C/C++ 1.00
2020h PIPE Y Y by Thomas W. Olson, in Windows/DOS DevJrn 5/92
21EAh VADLIBWD N Y Adlib Waveform Driver by John Ridges
2200h VFINTD Y Y Norton VFINTD (Norton Desktop)
22C0h ??? Y Rational Systems DOS/4GW ???
2402h ZMAX N N Qualitas 386MAX v7 DOSMAX handler
24A0h VNSS N Y Norton Screen Saver (Norton Desktop)
24A1h VNDWD Y Y Norton VNDWD Device (Norton Desktop)
24A2h SYMEvent Y Y Norton Utilities v8
2540h VILD Y N INTERLNK client from MS-DOS v6.x
2640h VASBID N Y WinResKit: Artisoft Sounding Board Device
2860h COMMTASK N N Y Windows 386-mode preemptive tasker by James
A. Kenemuth of Interabang Computing
28A1h PharLap Y Y Y PharLap 386|DOS-Extender DOSXNT.386
28C0h VXD N Y Y Generic VxD for real and protected mode by
Andrew Schulman in MSJ February 1993
2925h EDOS Y Y Enhanced DOS by Firefly Software
292Dh VSBPD Y Y Sound Blaster Pro
3098h VstlthD N N N for QEMM Stealth ROM mode
310Eh WPS N Y MS DevNet CD-ROM: Windows Process Status
32CBh VFRAD Y Y Dr.Franz - Simulatan's diagnotics VFRAD.386
4321h POSTMSG Y Y (see #1436)
7A5Fh SIWVID Y Y Y Soft-ICE for Windows video driver
7FE0h VSWITCHD Y N by Jeff Prosise
7FE0h VWFD N Y Y reports windowed/fullscreen state
by Neil Sandlin of Microsoft
7FE1h VWATCHD N Y Y basic driver w/ no functionality except tracing
by Keith Jin of Microsoft PSS
7FE5h VFINTD N Y Y Virtual Floppy Interrupt trapper by Neil
Sandlin of Microsoft
7FE7h VMPAGES N Y Y demonstration of exporting VxD services, by
Neil Sandlin of Microsoft
7FE8h VPOSTD Y Y PostMessage() demo by Curtis J. Palmer of MS
7FE9h VIdleD N N N demonstration of Call_When_Idle function, by
Bernie McIlroy of Microsoft
7FEBh VMIOD N N N Virtual Monitor I/O Traffic Device, by Neil
Sandlin of Microsoft
7FEDh VMIRQD N N N Virtual Monitor IRQ Traffic Device, by Neil
Sandlin of Microsoft
8888h VbillD Bill Potvin II's for reversing Compaq LTE video
EEEEh VEPSD N N Virtual Extended Paging Services for
Borland C++ v4.0
Note: The high bit of the VxD ID is reserved for future use. The
next 10 bits are the OEM number which is assigned by Microsoft. The
low 5 bits are the device number. Naturally, this scheme has not
been adhered to since there are now more than 32 different VxDs.
--------W-2F1684BX0005-----------------------
INT 2F - MS Windows - VTD - GET DEVICE API ENTRY POINT
AX = 1684h
BX = 0005h (virtual device ID for VTD device) (see #1419)
ES:DI = 0000h:0000h
Return: ES:DI -> VxD API entry point (see #1420)
0000h:0000h if the VxD does not support an API
(Table 1420)
Call VTD.386 entry point with:
AX = 0000h get VTD version number
Return: AH = major version
AL = minor version
AX = 0100h get current clock tick time
Return: EDX:EAX = clock tick time in 840ns units since Windows was
started
AX = 0101h get current system time in milliseconds
Return: EAX = time in milliseconds that Windows has been running
AX = 0102h get current virtual machine time
Return: EAX = cumulative amount of time the virtual machine has
been active, in milliseconds
Note: this entry point should only be called directly when TOOLHELP.DLL
TimerCount() cannot be called
--------W-2F1684BX0009-----------------------
INT 2F - MS Windows - REBOOT - GET DEVICE API ENTRY POINT
AX = 1684h
BX = 0009h (virtual device ID for REBOOT device) (see #1419)
ES:DI = 0000h:0000h
Return: ES:DI -> VxD API entry point (see #1421)
0000h:0000h if the VxD does not support an API
(Table 1421)
Call REBOOT protected-mode entry point with:
AX = function
0100h warm boot
Return: never
Note: broadcasts "Reboot_Processor" message, which is caught
by the VKD device
0201h set KERNEL Ctrl-Alt-Del handler
ES:DI -> new Ctrl-Alt-Del handler
DS:SI -> KERNEL reboot sanity check byte
Return: CF clear
Notes: if an application installs its own handler and then
chains to Windows' handler, Windows will no longer
be able to detect hung applications, and will always
produce an "Application not responding" dialog
DS must contain a writable, fixed selector because
the provided address is converted to a linear address
before being stored
when Ctrl-Alt-Del is pressed in the system VM, Reboot
sets the sanity check byte to zero, schedules a
750ms wait, and then tests whether the check byte is
still zero; if not, it displays a message that there
is no hung application and then exits
0202h get KERNEL Ctrl-Alt-Del handler
Return: CF clear
ES:DI -> current Ctrl-Alt-Del handler
Note: the default handler is located in KERNEL
0203h display "Application not responding" dialog box
ES:DI -> ASCIZ name of hung application
Return: never if user pressed Ctrl-Alt-Del a second time
CF clear
AX = result
0000h user pressed Esc
0001h user pressed Enter
Note: this function is used by the default Windows
Ctrl-Alt-Del handler
0204h set/reset protected-mode INT 01 handler
CX:EDX -> new protected-mode INT 01 handler
CX = 0000h restore protected-mode INT 01 handler
Return: CF clear
Notes: if CX is nonzero, the current handler address is saved
internally before the new handler is set; this saved
address is then used when CX is zero on entry
used by Windows' default Ctrl-Alt-Del handler; actual
fatal exit to DOS will be done on next INT 01
Warning: opened files are not closed and remain open as
orphaned files in DOS
Note: functions 0201h and 0203h are not useful outside the system VM
--------W-2F1684BX0015-----------------------
INT 2F - MS Windows - DOSMGR - GET DEVICE API ENTRY POINT
AX = 1684h
BX = 0015h (virtual device ID for DOSMGR device) (see #1419)
ES:DI = 0000h:0000h
Return: ES:DI -> VxD API entry point (see #1422)
0000h:0000h if the VxD does not support an API
(Table 1422)
Call DOSMGR entry point with:
AX = 0000h get DOSMGR version
Return: CF clear
AX = version (AH = major, AL = minor)
AX = 0001h set critical focus
Return: CF clear
AX = 0002h crash current virtual machine
Return: never
Note: displays message box stating that "application has been
stopped by the DOSMGR device"
AX = 0003h enter critical section
Note: this function assumes that the code for INT 2A/AX=8001h
and INT 2A/AX=8002h have been modified for Windows
AX = 0004h get VM ID byte
Return: CF clear if successful
ES:DI -> VM ID byte
CF set on error
Note: this function fails if the INT 2A modifications have not
yet been applied
AX = 0005h inform Windows of possible media change
BL = drive number (00h=A:)
Return: CF clear if successful
CF set on error
--------W-2F1684BX0017-----------------------
INT 2F U - MS Windows - SHELL - GET DEVICE API ENTRY POINT
AX = 1684h
BX = 0017h (virtual device ID for SHELL device) (see #1419)
ES:DI = 0000h:0000h
Return: ES:DI -> VxD API entry point (see #1423)
0000h:0000h if the VxD does not support an API
SeeAlso: AX=1684h/BX=0021h
(Table 1423)
Call SHELL entry point with:
EDX = function number (0000h-0016h, mostly unknown)
0000h get version number
Return: AX = version number
EBX = system VM handle
0001h "SHELL_Get_SYSVM_Info" get system VM information
Return: CF clear
AX bit 0 set if system VM executing exclusively
BX = background time slice priority
CX = foreground time slice priority
SI = minimum time slice in milliseconds
0002h "SHELL_Set_SYSVM_Info" set system VM information
AX bit 0 set if system VM should execute exclusively (ignored?)
BX = background time slice priority (1-10000)
CX = foreground time slice priority (1-10000)
SI = minimum time slice in milliseconds (1-10000)
Return: CF clear if successful
0003h "SHELL_Crt_VM" create a virtual machine
ES:EDI -> SEB structure (see #1424)
Return: CF clear if successful
EAX = VM handle
CF set on error
EDX,EAX = result from GetSetDetailedVMError()
0004h "SHELL_Destroy_VM" destroy a virtual machine
EBX = VM handle (not system VM)
Return: nothing
0005h "SHELL_Set_Focus"
EBX = VM handle
ECX = ???
Return: nothing
0006h "SHELL_Get_VM_State"
EBX = VM handle (not system VM)
ES:EDI -> ??? structure
Return: CF clear if successful
0007h "SHELL_Set_VM_State"
EBX = VM handle (not system VM)
ES:EDI -> ??? structure
0008h "SHELL_Debug_Out"
???
Return: ???
Note: dummy function in retail version of MS Windows
0009h "SHELL_VMDA_Init"
???
Return: ???
000Ah "SHELL_VMDA_Exit"
???
Return: ???
000Bh "SHELL_Get_Message_Txt"
???
Return: ???
000Ch "SHELL_Event_Complete"
???
Return: ???
000Dh "SHELL_Get_Contention_Info"
???
Return: ???
000Eh "SHELL_Get_Clip_Info"
???
Return: ???
000Fh "SHELL_Set_Paste"
???
Return: ???
0010h "SHELL_Switcher_Assist"
???
Return: ???
0011h "SHELL_Get_FileSysChng"
???
Return: ???
0012h "SHELL_Query_Destroy"
???
Return: ???
0013h "SHELL_SetFocus_Cur_VM" set input focus to current VM
???
Return: ???
0014h "SHELL_User_Busy_API"
???
Return: ???
0015h "SHELL_Chng_Hot_Key"
???
Return: ???
0016h "SHELL_Get_TermInfo"
???
Return: ???
Return: CF set if called from VM other than system VM
EAX = FFFFFFFFh
Note: except for function 0013h, this API may only be called from the system
VM
Format of Shell Execution Block (SEB):
Offset Size Description (Table 1424)
00h DWORD PIF flags (see #1425)
04h DWORD display flags (see #1426)
08h PWORD -> pathname of .EXE to run
0Eh PWORD -> argument list
14h PWORD -> working drive/directory
1Ah WORD desired number of V86 pages for virtual machine
1Ch WORD minimum number of V86 pages for VM
1Eh WORD foreground priority
20h WORD background priority
22h WORD maximum KB of EMS
24h WORD minimum KB of EMS
26h WORD maximum KB of XMS
28h WORD minimum KB of XMS
2Ah WORD ???
2Ch WORD ???
2Eh 128 BYTEs title
Note: the PWORDs at offsets 08h,0Eh, and 14h consist of a DWORD offset
followed by a WORD selector
Bitfields for 386 Enhanced Mode PIF flags:
Bit(s) Description (Table 1425)
0 exclusive use of processor when VM is fullscreen
1 VM runs in background
2 VM runs in window
3-4 ???
5 Alt-Tab reserved
6 Alt-Esc reserved
7 Alt-Space reserved
8 Alt-Enter reserved
9 Alt-PrtSc reserved
10 PrtSc reserved
11 Ctrl-Esc reserved
12 VM will release idle time slice
13 VM not allowed to use high mem
14 unknown
15 VM expanded mem not pageable
16 VM extended mem not pageable
17 Fast paste from clipboard enabled
18 VM app memory not pageable
30 Close VM when app exits
Bitfields for SHELL display options:
Bit(s) Description (Table 1426)
0 emulate text mode
1 monitor text port
2 monitor low graphics port
3 monitor high graphics port
7 Retain video memory
--------W-2F1684BX0021-----------------------
INT 2F U - MS Windows - PAGEFILE - GET DEVICE API ENTRY POINT
AX = 1684h
BX = 0021h (virtual device ID for PAGEFILE device) (see #1419)
ES:DI = 0000h:0000h
Return: ES:DI -> VxD API entry point (see #1427)
0000h:0000h if the VxD does not support an API
SeeAlso: AX=1684h/BX=0017h
(Table 1427)
Call PAGEFILE entry point with:
AX = function
0000h get version
Return: CF clear
AX = version (AH = major, AL = minor)
0001h get swap file info
DS:SI -> 128-byte buffer for swap file full pathname
DS:DI -> 128-byte buffer for SPART.PAR full pathname
Return: CF clear
AL = pager type (see #1428)
AH = flags
bit 7: swap file corrupted
ECX = maximum size of swap file
DS:SI buffer filled if paging enabled
DS:DI buffer filled if permanent swap file
0002h delete permanent swap file on exit
Return: CF clear
0003h get current temporary swap file size
Return: CF clear
DX:AX = current swap file size in bytes
0000h:0000h if permanent swap file
Note: this API is only available in protected mode, and may only be called
from the system VM
(Table 1428)
Values for MS Windows PAGEFILE pager type:
00h paging disabled
01h MSDOS
02h BIOS
03h 32-bit disk access
SeeAlso: #1427
--------W-2F1684BX0034-----------------------
INT 2F U - Intel Plug-and-Play - CONFIGURATION MANAGER - GET ENTRY POINT
AX = 1684h
BX = 0034h (ID for Configuration Manager) (see #1419)
ES:DI = 0000h:0000h
Return: ES:DI -> API entry point (see #1429)
0000h:0000h if Configuration Manager not loaded
Index: installation check;Plug-and-Play Configuration Manager
(Table 1429)
Call Configuration Manager entry point with:
AX = function
0000h "CM_GetVersion" get supported DDI version
Return: AH = major version (01h)
AL = minor version (00h)
BX = number of devices identified by configuration
Note: returns AX = 0000h if no config manager installed
0001h "CM_GetConfig" get device configuration
BX = device index
ES:DI -> buffer for configuration information (see #1430)
Return: AX = status
0000h successful
ES:DI buffer filled
other error code (0001h = index out of range)
0002h "CM_LockConfig" lock device configuration
ES:DI -> configuration information
Return: AX = status
0000h successful
ES:DI buffer filled with assigned config
0001h resources conflict
0002h invalid request or configuration info
0003h "CM_UnlockConfig" unlock device configuration
ES:DI -> configuration information
Return: AX = status
0000h successful
ES:DI buffer filled with assigned config
0001h invalid request or configuration info
Format of Configuration Information Structure:
Offset Size Description (Table 1430)
00h DWORD bus ID
04h DWORD device ID
08h DWORD serial number
0Ch DWORD logical ID
10h DWORD flags
---ISA bus---
14h BYTE Card Select Number
15h BYTE logical device number
16h WORD Read Data port
------
18h WORD number of memory windows
1Ah 9 DWORDs physical base addresses of memory windows
3Eh 9 DWORDs length of memory windows
62h 9 WORDs memory window attributes
74h WORD number of I/O ports
76h 20 WORDs I/O port base addresses
B6h 20 WORDs lengths of I/O port ranges
F6h WORD number of IRQs
F8h 7 BYTEs IRQ registers
FFh 7 BYTEs IRQ attributes
106h WORD number of DMA channels
108h 7 BYTEs DMA channels used
10Fh 7 WORDs DMA channel attributes
11Dh 3 BYTEs reserved
SeeAlso: #1429
--------W-2F1684BX0444-----------------------
INT 2F - MS Windows - VADMAD - GET DEVICE API ENTRY POINT
AX = 1684h
BX = 0444h (virtual device ID for VADMAD device) (see #1419)
ES:DI = 0000h:0000h
Return: ES:DI -> VxD API entry point (see #1431)
0000h:0000h if the VxD does not support an API
(Table 1431)
Call VADMAD entry point with:
DX = operation
0000h set VADMAD mode
AX = desired mode
0001h set VADMAD channel
AX = desired channel
Note: after setting mode/channel, start the DMA operation with an OUT to
I/O port 0Bh (channels 0-3) or D6h (channels 4-7)
--------W-2F1684BX0750-----------------------
INT 2F - MS Windows - VSWITCHD - GET DEVICE API ENTRY POINT
AX = 1684h
BX = 0750h (virtual device ID for VSWITCHD device) (see #1419)
ES:DI = 0000h:0000h
Return: ES:DI -> VxD API entry point (see #1432)
0000h:0000h if the VxD does not support an API
(Table 1432)
Call VSWITCHD entry point with:
AX = function
0000h toggle windowed mode (simulate Alt-Enter keypress)
Return: nothing
0001h get windowed mode
Return: CF clear if VM is windowed
CF set if VM is full-screen
--------W-2F1684BX2925-----------------------
INT 2F - MS Windows - EDOS - GET DEVICE API ENTRY POINT
AX = 1684h
BX = 2925h (virtual device ID for EDOS device) (see #1419)
ES:DI = 0000h:0000h
Return: ES:DI -> VxD API entry point (see #1433)
0000h:0000h if the VxD does not support an API
(Table 1433)
Call EDOS entry point with:
AX = 0000h get EDOS version number
Return: AH = major version
AL = minor version
AX = 0001h display message
CX = 0
DX:BX -> ASCIZ Message
AX = 0002h get EDOS error coded
Return: EAX = time in milliseconds that Windows has been running
AX = 0003h execute windows program
Return: EAX = cumulative amount of time the virtual machine has
been active, in milliseconds
AX = 0008h get/set priority
BX = 0000h??? foreground
0001h background
DI = 0000h get
0001h set
DX = priority setting
Return: CX = foreground priority
DX = background priority
BX:AX = flags
00000001h exclusive ON
00000010h background ON
SI = CPU percentage
--------W-2F1684BX310E-----------------------
INT 2F - MS Windows - WPS - GET DEVICE API ENTRY POINT
AX = 1684h
BX = 310Eh (virtual device ID for WPS device) (see #1419)
ES:DI = 0000h:0000h
Return: ES:DI -> VxD API entry point (see #1434)
0000h:0000h if the VxD does not support an API
(Table 1434)
Call WPS protected-mode entry point with:
DX = function
0000h get WPS.386 version
Return: CF clear
AX = version (AH = major, AL = minor)
0001h get number of installed VxDs
Return: CF clear
AX = number of installed VxDs
0002h get VxD characteristics
AX = number of VxD
ES:BX -> buffer for VxD characteristics structure (see #1435)
Return: CF clear
ES:BX buffer filled
Format of WPS.386 VxD characteristics structure:
Offset Size Description (Table 1435)
00h WORD VxD ID number
02h BYTE VxD minor version
03h BYTE VxD major version
04h BYTE DDK minor version
05h BYTE DDK major version
06h WORD flags
bit 0: V86 API supported
bit 1: PM API supported
bit 2: services supported
08h DWORD start order
0Ch 9 BYTEs ASCIZ VxD name
--------W-2F1684BX8888-----------------------
INT 2F - MS Windows - POSTMSG - GET DEVICE API ENTRY POINT
AX = 1684h
BX = 8888h (virtual device ID for POSTMSG device) (see #1419)
ES:DI = 0000h:0000h
Return: ES:DI -> VxD API entry point (see #1436,#1438)
0000h:0000h if the VxD does not support an API
(Table 1436)
Call POSTMSG protected-mode entry point with:
AX = window handle
CX:BX -> callback procedure (see #1437)
Return: nothing
Note: this call registers a WinApp with the VxD; the callback must be in a
fixed, non-discardable code segment
SeeAlso: #1438
(Table 1437)
Values POSTMSG callback routine is called with:
STACK: DWORD "lParam" parameter from DOSApp
WORD "wParam" parameter from DOSApp
WORD Windows message number (WM_USER + 100)
DWORD registered hwnd
(Table 1438)
Call POSTMSG V86-mode entry point with:
BX = wParam value to pass to protected-mode callback
DX:AX = lParam value to pass to protected-mode callback
Return: CF clear if successful
CF set on error (no WinApp registered)
SeeAlso: #1436
--------W-2F1684BX8888-----------------------
INT 2F - MS Windows - VbillD - GET DEVICE API ENTRY POINT
AX = 1684h
BX = 8888h (virtual device ID for VbillD device) (see #1419)
ES:DI = 0000h:0000h
Return: ES:DI -> VxD API entry point (see #1439)
0000h:0000h if the VxD does not support an API
(Table 1439)
Call VbillD entry point with:
AX = function
0001h set reverse video
0002h set normal video
Return: ???
--------W-2F1685-----------------------------
INT 2F - MS Windows - SWITCH VMs AND CALLBACK
AX = 1685h
BX = VM ID of virtual machine to switch to
CX = flags (see #1440)
DX:SI = priority boost (see VMM.INC)
ES:DI -> FAR procedure to callback
Return: CF set on error
AX = error code
01h invalid VM ID
02h invalid priority boost
03h invalid flags
CF clear if successful
event will be or has been called
Notes: some DOS devices, such as networks, need to call functions in a
specific VM. This call forces the appropriate VM to be installed.
the callback procedure must preserve all registers and return with IRET
SeeAlso: AX=1683h,INT 15/AX=1117h,AX=DB06h"WINGO"
Bitfields for VM switching flags:
Bit(s) Description (Table 1440)
0 wait until interrupts enabled
1 wait until critical section unowned
2-15 reserved (zero)
--------E-2F1686-----------------------------
INT 2F - DOS Protected-Mode Interface - DETECT MODE
AX = 1686h
Return: AX = 0000h if operating in protected mode under DPMI (INT 31 available)
AX nonzero if in real/V86 mode or no DPMI (INT 31 not available)
SeeAlso: AX=1687h
--------E-2F1687-----------------------------
INT 2F - DOS Protected-Mode Interface - INSTALLATION CHECK
AX = 1687h
Return: AX = 0000h if installed
BX = flags
bit 0: 32-bit programs supported
CL = processor type (02h=80286, 03h=80386, 04h=80486)
DH = DPMI major version
DL = two-digit DPMI minor version (binary)
SI = number of paragraphs of DOS extender private data
ES:DI -> DPMI mode-switch entry point (see #1441)
AX nonzero if not installed
SeeAlso: AX=1686h,AX=43E0h,AX=DE01h/BX=4450h,AX=FB42h/BX=0001h
SeeAlso: INT 31/AX=0400h,INT 31/AX=5702h,INT 38/AH=10h
(Table 1441)
Call DPMI mode switch entry point with:
AX = flags
bit 0: set if 32-bit program
ES = real mode segment of buffer for DPMI private data (ignored if
SI was zero)
Return: CF set on error
program still in real mode
AX = error code (DPMI 1.0+)
8011h unable to allocate all necessary descriptors
8021h 32-bit program specified, but 16-bit DPMI host
CF clear if successful
CS = 16-bit selector corresponding to real-mode CS
SS = selector corresponding to real-mode SS (64K limit)
DS = selector corresponding to real-mode DS (64K limit)
ES = selector to program's PSP (100h byte limit)
FS = GS = 0
high word of ESP = 0 if 32-bit program
program now in protected mode
Note: this entry point is only called for the initial switch to protected
mode
--------W-2F1688BX0BAD-----------------------
INT 2F U - MS Windows 3.0, 386MAX v6.01 - GET ALIAS SELECTOR TO LDT
AX = 1688h
BX = 0BADh
Return: AX = 0000h if supported
BX = alias selector for LDT
Note: use the LSL instruction or GetSelectorLimit() to find LDT size
this call should be considered obsolete for Windows 3.1+, as the
alias selector can be retrieved via the API entry point for
"MS-DOS" retrieved from INT 2F/AX=168Ah (see #1443)
--------W-2F1689-----------------------------
INT 2F U - MS Windows 3.0+ - KERNEL IDLE CALL
AX = 1689h
???
Return: ???
SeeAlso: AX=1680h,INT 15/AX=1000h,INT 28
--------E-2F168A-----------------------------
INT 2F - DPMI 0.9+ - GET VENDOR-SPECIFIC API ENTRY POINT
AX = 168Ah
DS:(E)SI = selector:offset of ASCIZ vendor name (see #1442)
Return: AL = status
00h successful
ES:(E)DI -> extended API entry point
8Ah unsuccessful
Notes: the vendor name is used to determine which entry point to return; it is
case-sensitive
available in protected mode only
32-bit applications use ESI and EDI, 16-bit applications use SI and DI
this call is present but not documented for DPMI 0.9
the Borland C++ 3.1 DPMILOAD does not handle requests for entry points
other than the MS-DOS one gracefully, producing an unhandled
exception report; this has been fixed in the Borland Pascal 7 version
SeeAlso: INT 31/AX=0A00h,INT 31/AH=57h
(Table 1442)
Values for DPMI vendor-specific API names:
"MS-DOS" MS Windows and 386MAX v6.00+ (see #1443)
"386MAX" 386MAX v6.00+
"HELIX_DPMI" Helix Netroom's DPMI server
"Phar Lap" Phar Lap 286|DOS-Extender RUN286 (see #1444)
(Table 1443)
Call Windows-support ("MS-DOS") entry point with:
AX = 0100h get LDT alias selector
Return: CF clear if successful
AX = alias selector
CF set on error
(Table 1444)
Call Phar Lap RUN286 entry point with:
AX = 0000h (function "load MSW")
BX = new value for MSW register (low word of CR0)
Return: ???
--------W-2F168B-----------------------------
INT 2F - MS Windows 3.1 - SET FOCUS TO SPECIFIED VIRTUAL MACHINE
AX = 168Bh
BX = virtual machine ID (see AX=1683h), 0000h for current DOS box
Return: AL = 00h if focus set to specified VM
Notes: documented on the Microsoft Developer's Network CD-ROM
if the VM is a windowed DOS box, it will be set to full screen
SeeAlso: AX=1683h
--------W-2F168C-----------------------------
INT 2F - MS Windows 3.1 - RESTART COMMAND
AX = 168Ch
???
Return: ???
Note: WIN.COM executes specified application
--------W-2F1700-----------------------------
INT 2F - MS Windows "WINOLDAP" - IDENTIFY WinOldAp VERSION
AX = 1700h
Return: AX = 1700h if this version of WINOLDAP doesn't support clipboard
AX <> 1700h
AL = WINOLDAP major version
AH = WINOLDAP minor version
Program: WinOldAp (WINOLDAP.MOD) is a Microsoft Windows extension supporting
"old" (character-mode) application access to Dynamic Data Exchange,
menus, and the Windows clipboard.
Note: this installation check DOES NOT follow the format used by other
software of returning AL=FFh
SeeAlso: AX=1701h,AX=4601h
Index: installation check;WINOLDAP
--------W-2F1701-----------------------------
INT 2F - MS Windows "WINOLDAP" - OPEN CLIPBOARD
AX = 1701h
Return: AX = status
nonzero success
0000h clipboard is already open
SeeAlso: AX=1700h,AX=1702h,AX=1703h,AX=1704h
--------W-2F1702-----------------------------
INT 2F - MS Windows "WINOLDAP" - EMPTY CLIPBOARD
AX = 1702h
Return: AX = status
nonzero clipboard has been emptied
0000h failure
SeeAlso: AX=1700h,AX=1701h,AX=1703h,AX=1704h
--------W-2F1703-----------------------------
INT 2F - MS Windows "WINOLDAP" - SET CLIPBOARD DATA
AX = 1703h
DX = clipboard format supported by WinOldAp (see #1445)
ES:BX -> data (see #1446,#1447)
SI:CX = size of data
Return: AX = status
nonzero data copied into the Clipboard
0000h failure
(Table 1445)
Values for WinOldAp clipboard format:
01h text
02h bitmap
03h metafile picture
04h SYLK
05h DIF
06h TIFF
07h OEM text
08h DIB bitmap
80h special format (used by Windows WRITE, maybe other Windows applets???)
81h DSP text
82h DSP bitmap
Format of Windows Clipboard bitmap:
Offset Size Description (Table 1446)
00h WORD type (0000h)
02h WORD width of bitmap in pixels
04h WORD height of bitmap in pixels
06h WORD bytes per line
08h BYTE number of color planes
09h BYTE number of adjacent color bits in pixel
0Ah DWORD pointer to start of data
0Eh WORD width in 0.1mm units
10h WORD height in 0.1mm units
12h N BYTEs bitmap data
Format of Windows metafile picture:
Offset Size Description (Table 1447)
00h WORD mapping mode
02h WORD X extent
04h WORD Y extent
06h WORD picture data
--------W-2F1704-----------------------------
INT 2F - MS Windows "WINOLDAP" - GET CLIPBOARD DATA SIZE
AX = 1704h
DX = clipboard format supported by WinOldAp (see #1445)
Return: DX:AX = size of data in bytes, including any headers
0000h:0000h if no data in this format in the Clipboard
Note: Windows reportedly rounds up the size of the data to a multiple of 32
bytes
--------W-2F1705-----------------------------
INT 2F - MS Windows "WINOLDAP" - GET CLIPBOARD DATA
AX = 1705h
DX = clipboard format supported by WinOldAp (see #1445)
ES:BX -> buffer
Return: AX = status
nonzero success
0000h error, or no data in this format in Clipboard
--------W-2F1708-----------------------------
INT 2F - MS Windows "WINOLDAP" - CloseClipboard
AX = 1708h
Return: AX = status
0000h failure
nonzero success
--------W-2F1709-----------------------------
INT 2F - MS Windows "WINOLDAP" - COMPACT CLIPBOARD
AX = 1709h
SI:CX = desired size in bytes
Return: DX:AX = number of bytes in largest block of free memory
Note: WinOldAp is responsible for including the size of any headers
--------W-2F170A-----------------------------
INT 2F - MS Windows "WINOLDAP" - GET DEVICE CAPABILITIES
AX = 170Ah
DX = GDI information index (see #1448)
Return: AX = integer value of the desired item
(see #1449,#1450,#1451,#1452,#1453,#1454,#1455)
Note: This function returns the device-capability bits for the given display
(Table 1448)
Values for GDI information index:
00h device driver version
02h device classification
04h width in mm
06h height in mm
08h width in pixels
0Ah height in pixels
0Ch bits per pixel
0Eh number of bit planes
10h number of brushes supported by device
12h number of pens supported by device
14h number of markers supported by device
16h number of fonts supported by device
18h number of colors
1Ah size required for device descriptor
1Ch curve capabilities
1Eh line capabilities
20h polygon capabilities
22h text capabilities
24h clipping capabilities
26h bitblt capabilities
28h X aspect
2Ah Y aspect
2Ch length of hypotenuse of aspect
58h logical pixels per inch of width
5Ah logical pixels per inch of height
SeeAlso: #1449,#1450,#1451,#1452,#1453,#1454,#1455
(Table 1449)
Values for device classification:
00h vector plotter
01h raster display
02h raster printer
03h raster camera
04h character-stream, PLP
05h Metafile, VDM
06h display-file
SeeAlso: #1448,#1450,#1451,#1452,#1453,#1454,#1455
Bitfields for curve capabilities:
Bit(s) Description (Table 1450)
0 circles
1 pie wedges
2 chord arcs
3 ellipses
4 wide lines
5 styled lines
6 wide styled lines
7 interiors
SeeAlso: #1448,#1449,#1451,#1452,#1453,#1454,#1455
Bitfields for line capabilities:
Bit(s) Description (Table 1451)
1 polylines
2 markers
3 polymarkers
4 wide lines
5 styled lines
6 wide styled lines
7 interiors
SeeAlso: #1448,#1449,#1450,#1452,#1453,#1454,#1455
Bitfields for polygon capabilities:
Bit(s) Description (Table 1452)
0 polygons
1 rectangles
2 trapezoids
3 scanlines
4 wide borders
5 styled borders
6 wide styled borders
7 interiors
SeeAlso: #1448,#1449,#1450,#1451,#1453,#1454,#1455
Bitfields for text capabilities:
Bit(s) Description (Table 1453)
0 output precision character
1 output precision stroke
2 clippping precision stroke
3 90-degree character rotation
4 arbitrary character rotation
5 independent X and Y scaling
6 double-size
7 integer scaling
8 continuous scaling
9 bold
10 italic
11 underline
12 strikeout
13 raster fonts
14 vector fonts
15 reserved
SeeAlso: #1448,#1449,#1450,#1451,#1452,#1454,#1455
(Table 1454)
Values for clipping capabilities:
00h none
01h clipping to rectangles
SeeAlso: #1448,#1449,#1450,#1451,#1452,#1453,#1455
Bitfields for raster capabilities:
Bit(s) Description (Table 1455)
0 simple bitBLT
1 device requires banding support
2 device requires scaling support
3 supports >64K bitmap
SeeAlso: #1448,#1449,#1450,#1451,#1452,#1453,#1454
----------2F18-------------------------------
INT 2F U - MS-Manager
AH = 18h
???
Return: ???
--------l-2F1900-----------------------------
INT 2F U - DOS 4.x only SHELLB.COM - INSTALLATION CHECK
AX = 1900h
Return: AL = status
00h not installed
FFh installed
--------l-2F1901-----------------------------
INT 2F U - DOS 4.x only SHELLB.COM - SHELLC.EXE INTERFACE
AX = 1901h
BL = SHELLC type
00h transient
01h resident
DS:DX -> far call entry point for resident SHELLC.EXE
Return: ES:DI -> SHELLC.EXE workspace within SHELLB.COM
Note: SHELLB.COM and SHELLC.EXE are parts of the DOS 4.x shell
--------l-2F1902-----------------------------
INT 2F U - DOS 4.x only SHELLB.COM - COMMAND.COM INTERFACE
AX = 1902h
ES:DI -> ASCIZ full filename of current batch file, with at least the
final filename element uppercased
DS:DX -> buffer for results
Return: AL = 00h failed, either
(a) final filename element quoted at ES:DI does not match
identity of shell batch file quoted as parameter of most
recent call of SHELLB command, or
(b) no more Program Start Commands available.
AL= FFh success, then:
memory at DS:[DX+1] onwards filled as:
DX+1: BYTE count of bytes of PSC
DX+2: N BYTEs Program Start Command text
BYTE 0Dh terminator
Desc: COMMAND.COM executes the result of this call in preference to
reading a command from a batch file. Thus the batch file does not
advance in execution for so long as SHELLB provides PSCs from its
workspace.
Note: The PSCs are planted in SHELLB workspace by SHELLC, the user
menu interface. The final PSC of a sequence is finished with a
GOTO COMMON, which causes a loop back in the batch file which called
SHELLC so as to execute SHELLC again. The check on batch file name
permits PSCs to CALL nested batch files while PSCs are still stacked
up for subsequent execution.
--------l-2F1903-----------------------------
INT 2F U - DOS 4.x only SHELLB.COM - COMMAND.COM interface
AX = 1903h
ES:DI -> ASCIZ batch file name as for AX=1902h
Return: AL = status
FFh quoted batch file name matches last SHELLB parameter
00h it does not
--------l-2F1904-----------------------------
INT 2F U - DOS 4.x only SHELLB.COM - SHELLB transient to TSR intrface
AX = 1904h
Return: ES:DI -> name of current shell batch file:
WORD number of bytes of name following
BYTEs (8 max) uppercase name of shell batch file
--------V-2F1A00-----------------------------
INT 2F - DOS 4+ ANSI.SYS - INSTALLATION CHECK
AX = 1A00h
Return: AL = FFh if installed
Notes: AVATAR.SYS also responds to this call
documented for DOS 5+, but undocumented for DOS 4.x
--------V-2F1A00BX414E-----------------------
INT 2F - ANSIPLUS.SYS v2.00+ - INSTALLATION CHECK
AX = 1A00h
BX = 414Eh ('AN')
CX = 5349h ('SI')
DX = 2B2Bh ('++')
Return: AL = FFh if installed
CF clear
ES:BX -> INT 29 entry point
CX = ANSIPLUS BCD version number (v3.10+, CH=major, CL=minor)
DL = capabilities (v4.00+)
00h full capability driver
01h reduced capability driver
2Bh full capability driver (before v4.00)
Program: ANSIPLUS.SYS is a CON device driver by Kristofer Sweger which
replaces the normal ANSI.SYS is a more powerful version with many
additional features
Notes: ANSIPLUS also identifies itself as ANSI.SYS if BX,CX, or DX differ
from the magic values above
an additional installation check is to test for the signature
"ANSIPLUS" 12 bytes before the INT 29 entry point; the version
number is also available as a four-character ASCII string (e.g.
"4.00") four bytes before the entry point
SeeAlso: AX=1AA5h,AX=1AA6h,AX=1AA7h,AX=1AA8h,AX=1AA9h,AX=1AAAh,AX=D44Fh
--------V-2F1A00BX4156-----------------------
INT 2F - AVATAR.SYS - INSTALLATION CHECK
AX = 1A00h
BX = 4156h ('AV')
CX = 4154h ('AT')
DX = 4152h ('AR')
Return: AL = FFh if installed
CF clear
BX = AVATAR protocol level supported
CX = driver type
0000h AVATAR.SYS
4456h DVAVATAR.COM inside DESQview window
DX = 0016h
Program: AVATAR.SYS is a CON replacement by George Adam Stanislav which
interprets AVATAR command codes in the same way that ANSI interprets
ANSI command codes
Notes: AVATAR also identifies itself as ANSI.SYS if BX, CX, or DX differ from
the magic values
SeeAlso: AX=1A21h,AX=1A3Ch,AX=1A3Fh,AX=1A52h,AX=1A72h,AX=1A7Dh,AX=1AADh"AVATAR"
--------V-2F1A01-----------------------------
INT 2F U - DOS 4+ ANSI.SYS internal - GET/SET DISPLAY INFORMATION
AX = 1A01h
CL = function
7Fh for GET
5Fh for SET
DS:DX -> parm block as for INT 21,AX=440Ch,CX=037Fh/035Fh respectively
Return: CF clear if successful
AX destroyed
CF set on error
AX = error code (many non-standard)
Note: presumably this is the DOS IOCTL interface to ANSI.SYS
SeeAlso: AX=1A02h,INT 21/AX=440Ch
--------V-2F1A02-----------------------------
INT 2F U - DOS 4+ ANSI.SYS internal - MISCELLANEOUS REQUESTS
AX = 1A02h
DS:DX -> parameter block (see #1456)
Return: CF clear if successful
CF set on error
AX = error code
Note: DOS 5+ chains to previous handler if AL > 02h on call
SeeAlso: AX=1A01h
Format of ANSI.SYS parameter block:
Offset Size Description (Table 1456)
00h BYTE subfunction
00h set/reset interlock
01h get /L flag
01h BYTE interlock state
00h=reset, 01h=set
This interlock prevents some of the ANSI.SYS post-processing
in its hook onto INT 10, AH=00h mode set
02h BYTE (returned)
00h if /L not in effect
01h if /L in effect
--------V-2F1A21-----------------------------
INT 2F - AVATAR.SYS - SET DRIVER STATE
AX = 1A21h (AL='!')
DS:SI -> command string with one or more state characters (see #1457)
CX = length of command string
Return: CF set on error (invalid subfunction)
CF clear if successful
Note: the characters in the state string are interpreted left to right, and
need not be in any particular order
SeeAlso: AX=1A00h/BX=4156h,AX=1A3Fh
(Table 1457)
Values for AVATAR.SYS state characters:
'a' activate driver
'd' disable driver
'f' use fast screen output
'g' always convert gray keys (+ and -) to function keys
'G' never convert gray keys
'l' convert gray keys only when ScrollLock active
's' use slow screen output
't' Tandy 1000 keyboard (not yet implemented)
--------V-2F1A3C-----------------------------
INT 2F U - AVATAR.SYS v0.11 - ???
AX = 1A3Ch
???
Return: CX = 0000h
SeeAlso: AX=1A00h/BX=4156h,AX=1A21h,AX=1A3Eh
--------V-2F1A3E-----------------------------
INT 2F U - AVATAR.SYS v0.11 - ???
AX = 1A3Eh
CL = ???
CH = ???
DL = ???
DH = ???
Return: CL = ???
CH = ???
DL = ???
DH = ???
SeeAlso: AX=1A3Ch,AX=1A3Fh
--------V-2F1A3F-----------------------------
INT 2F - AVATAR.SYS - QUERY DRIVER STATE
AX = 1A3Fh (AL='?')
ES:DI -> buffer
CX = length of buffer in bytes
Return: CF clear
CX = actual size of returned info
Note: the returned information consists of multiple letters whose meanings
are described under AX=1A21h
SeeAlso: AX=1A00h/BX=4156h,AX=1A21h,AX=1A44h
--------S-2F1A42BX4156-----------------------
INT 2F - AVATAR Serial Dispatcher - INSTALL IRQ3 HANDLER
AX = 1A42h
BX = 4156h ('AV')
ES:DI -> FAR handler for serial port using IRQ3
DS = data segment needed by handler
Return: AX = status/return value
0000h if no more room
1A42h if ASD not installed
else handle to use when uninstalling
Notes: the handler need not save/restore registers or signal EOI to the
interrupt controller
the handler should return AX=0000h if the interrupt was meant for it,
and either leave AX unchanged or return a non-zero value otherwise
the most recently installed handler will be called first, continuing
to earlier handlers until one returns AX=0000h
SeeAlso: AX=1A43h,AX=1A62h
--------S-2F1A43BX4156-----------------------
INT 2F - AVATAR Serial Dispatcher - INSTALL IRQ4 HANDLER
AX = 1A43h
BX = 4156h ('AV')
ES:DI -> FAR handler for serial port using IRQ4
DS = data segment needed by handler
Return: AX = status/return value
0000h if no more room
1A43h if ASD not installed
else handle to use when uninstalling
Notes: (see AX=1A42h)
SeeAlso: AX=1A42h,AX=1A63h
--------V-2F1A44BX4156-----------------------
INT 2F - AVATAR.SYS v0.11+ - GET DATA SEGMENT
AX = 1A44h
BX = 4156h ('AV')
Return: AX = 0000h
DS = data segment
CX = size of data segment
Note: AVATAR.SYS calls this function whenever it is invoked. If each
process under a multitasker hooks this function and provides a
separate data segment, AVATAR.SYS becomes fully reentrant.
SeeAlso: AX=1A21h,AX=1A3Fh,AX=1A52h
--------V-2F1A52-----------------------------
INT 2F U - AVATAR.SYS v0.11 - GET ???
AX = 1A52h
CX = size of buffer
ES:DI -> buffer
Return: ??? copied into user buffer
Note: the maximum size of the data which may be copied is returned by
AX=1A72h
SeeAlso: AX=1A53h,AX=1A72h
--------V-2F1A53-----------------------------
INT 2F U - AVATAR.SYS v0.11 - ???
AX = 1A53h
CL = ??? (00h-05h)
???
Return: ???
SeeAlso: AX=1A00h/BX=4156h,AX=1A52h,AX=1A72h
--------S-2F1A62BX4156-----------------------
INT 2F - AVATAR Serial Dispatcher - UNINSTALL IRQ3 HANDLER
AX = 1A62h
BX = 4156h ('AV')
CX = handle for IRQ routine returned by AX=1A42h
SeeAlso: AX=1A42h,AX=1A63h
--------S-2F1A63BX4156-----------------------
INT 2F - AVATAR Serial Dispatcher - UNINSTALL IRQ4 HANDLER
AX = 1A63h
BX = 4156h ('AV')
CX = handle for IRQ routine returned by AX=1A43h
SeeAlso: AX=1A43h,AX=1A62h
--------V-2F1A72-----------------------------
INT 2F U - AVATAR.SYS v0.11 - GET ??? SIZE
AX = 1A72h
Return: CX = maximum size of ???
SeeAlso: AX=1A00h/BX=4156h,AX=1A52h,AX=1A7Bh,AX=1AADh"AVATAR"
--------V-2F1A7B-----------------------------
INT 2F U - AVATAR.SYS v0.11 - ???
AX = 1A7Bh
Return: AX = 0000h
CX = 0000h
SeeAlso: AX=1A00h/BX=4156h,AX=1A72h,AX=1A7Dh
--------V-2F1A7D-----------------------------
INT 2F U - AVATAR.SYS v0.11 - ???
AX = 1A7Dh
Return: AX = ???
SeeAlso: AX=1A00h/BX=4156h,AX=1A7Bh
--------V-2F1AA5-----------------------------
INT 2F - ANSIPLUS v4.00+ - GET/SET ANSIPLUS CLIPBOARD
AX = 1AA5h
DH = subfunction
00h get clipboard information
01h get clipboard text
02h set clipboard text
03h append text to clipboard
04h clear clipboard
05h paste clipboard to keyboard
ES:BX -> data area for subfunctions 01h, 02h, and 03h
CX = size of data area (maximum size for subfunction 01h, actual size
to add to clipboard for subfunctions 02h and 03h)
Return: AL = status
00h successful
01h unsupported subfunction (reduced capability driver)
02h insufficient space
A5h unsupported function (ANSIPLUS before v4.00)
ES:BX -> ANSIPLUS local clipboard data
CX = number of bytes currently in local clipboard
DX = maximum size of local clipboard
SeeAlso: AX=1A00h/BX=414Eh,AX=1AA6h
--------V-2F1AA6-----------------------------
INT 2F - ANSIPLUS v4.00+ - ENABLE/DISABLE ANSIPLUS DRIVER
AX = 1AA6h
BH = function
00h get hooked interrupts
01h set hooked interrupts mask
BL = new interrupts mask (see #1458)
Return: BL = previous interrupts mask (see #1458)
SeeAlso: AX=1A00h/BX=414Eh,AX=1AA7h
Desc: used to temporarily disable any prior copies of ANSIPLUS when a new
copy is installed, such as in a multitasking system like DESQview
Note: only the most-recently loaded copy of ANSIPLUS on the current INT 2F
chain responds to this call
Bitfields for ANSIPLUS hooked interrupts mask:
Bit(s) Description (Table 1458)
0 INT 09 hook disabled
1 INT 10 hook disabled
2 INT 15 hook disabled
3 INT 16 hook disabled
4 INT 1C hook disabled
5 reset all bits when INT 29 called
6 INT 29 hook disabled
7 INT 33, INT 74, or other mouse event hook disabled
--------V-2F1AA7-----------------------------
INT 2F - ANSIPLUS v4.00+ - ENABLE/DISABLE ANSIPLUS FEATURES
AX = 1AA7h
BL = function
00h prevent scroll-back saves
01h enable scroll-back saves
02h disable key reprogramming and lock changes by escape sequences
03h enable key reprogramming by escape sequences
04h disable and lock key stacking changes by escape sequences
05h allow key stacking by escape sequences
Return: nothing
SeeAlso: AX=1AA6h
--------V-2F1AA8-----------------------------
INT 2F - ANSIPLUS v3.10+ - GET NEXT ANSIPLUS SCROLLBACK LINE
AX = 1AA8h
Return: AL = status
00h successful
ES:BX -> screen line (character and attribute pairs)
CX = length of line in bytes, 0000h if no more lines or
unsupported video mode
01h unsupported video mode active
02h screen currently scrolled back
03h reduced capability driver
A8h unsupported function (driver before v3.10)
SeeAlso: AX=1A00h/BX=414Eh,AX=1AA9h
--------V-2F1AA9-----------------------------
INT 2F - ANSIPLUS v3.10+ - GET ANSIPLUS SCROLLBACK INFORMATION
AX = 1AA9h
Return: AL = status
00h successful
BX = current number of lines in scrollback buffer
CX = number of bytes in one line
01h unsupported video mode active
02h screen currently scrolled back
03h reduced capability driver
A9h unsupported function (driver before v3.10)
Desc: determine how much data is in the scrollback buffer and initialize
scrollback retrieval to return the first line on the next call to
AX=1AA8h
SeeAlso: AX=1A00h/BX=414Eh,AX=1AA8h
--------V-2F1AAA-----------------------------
INT 2F - ANSIPLUS v3.01+ - GET/SET ANSIPLUS SCREEN SAVER BLANKING TIME
AX = 1AAAh
BX = function
FFFFh to get current blanking time
other to set time
CX = blanking time in clock ticks (0000h-7FFFh)
Return: BX = current blanking time
CX = blanking time when last set
SeeAlso: AX=1A00h/BX=414Eh,AX=1AABh
--------V-2F1AAB-----------------------------
INT 2F - ANSIPLUS v3.01+ - SET ANSIPLUS KEY REPEAT RATE
AX = 1AABh
BX = repeat rate in characters per second
0000h use BIOS repeat rate
Return: nothing
SeeAlso: AX=1A00h/BX=414Eh,AX=1AAAh,AX=1AACh
--------V-2F1AAC-----------------------------
INT 2F - ANSIPLUS v3.00+ - LOAD CHARACTER GENERATOR
AX = 1AACh
BH = number of bytes per character pattern
BL = VGA/EGA character table to be loaded
CX = number of characters to load
DX = starting character code (offset into Map2 block)
ES:BP -> user character table to be loaded
Return: AX = 1100h
Desc: load the EGA/VGA character generator without the BIOS function's
side effects of resetting the video mode and color palette
SeeAlso: AX=1A00h/BX=414Eh,AX=1AABh,AX=1AADh"ANSIPLUS",INT 10/AX=1100h
--------V-2F1AAD-----------------------------
INT 2F - ANSIPLUS v2.00+ - ANSIPLUS DEVICE STATUS REPORT
AX = 1AADh
BL = report request code (81h-96h for v4.00)
CX = color selector or key code, if required by request
Return: AX = first reported result
BX = second result
CX = third result, if applicable (unchanged otherwise)
DX = fourth result, if applicable (unchanged otherwise)
Desc: get device status reports equivalent to those for Esc [#n sequences
while bypassing any device redirection and avoiding the need to
parse the returned result
Note: the report request code in BL is identical to the number in the
corresponding Esc [#n sequence
SeeAlso: AX=1A00h/BX=414Eh,AX=1AACh
--------V-2F1AADDX0000-----------------------
INT 2F U - AVATAR.SYS v0.11 - ???
AX = 1AADh
DX = 0000h
CX = subfunction (00h-0Ch)
???
Return: AX = 0000h if DX was nonzero
???
SeeAlso: AX=1A00h/BX=4156h,AX=1A72h
--------V-2F1AAC-----------------------------
INT 2F - ANSIPLUS v3.00+ - LOAD CHARACTER GENERATOR
AX = 1AACh
--------m-2F1B00-----------------------------
INT 2F U - DOS 4+ XMA2EMS.SYS extension internal - INSTALLATION CHECK
AX = 1B00h
Return: AL = FFh if installed
Note: XMA2EMS.SYS extension is only installed if DOS has page frames to hide.
This extension hooks onto INT 67/AH=58h and returns from that call data
which excludes the physical pages being used by DOS.
SeeAlso: AH=1Bh"FRAME INFO"
--------m-2F1B-------------------------------
INT 2F U - DOS 4+ XMA2EMS.SYS extension internal - GET HIDDEN FRAME INFORMATION
AH = 1Bh
AL <> 00h
DI = hidden physical page number
Return: AX = FFFFh if failed (no such hidden page)
AX = 0000h if OK, then
ES = segment of page frame
DI = physical page number
Notes: this corresponds to the data edited out of the INT 67/AH=58h call
FASTOPEN makes this call with AL = FFh
SeeAlso: AX=1B00h
--------V-2F2300-----------------------------
INT 2F - DR-DOS 5.0 GRAFTABL - INSTALLATION CHECK
AX = 2300h
Return: AH = FFh
Note: this installation check does not follow the usual format
SeeAlso: AH=23h,AX=2E00h
--------V-2F23-------------------------------
INT 2F - DR-DOS 5.0 GRAFTABL - GET GRAPHICS DATA
AH = 23h
AL nonzero
Return: AH = FFh
ES:BX -> graphics data (8 bytes for each character from 80h to FFh)
SeeAlso: AX=2300h,AX=2E00h
--------T-2F2700-----------------------------
INT 2F - DR-DOS 6.0 TaskMAX - INSTALLATION CHECK
AX = 2700h
Return: AL = status
00h not installed
FFh installed
Note: the TaskMAX API is also supported by Novell DOS 7 TASKMGR in
taskswitching mode
--------T-2F2701-----------------------------
INT 2F - DR-DOS 6.0 TaskMAX - GET STATUS
AX = 2701h
Return: AX = maximum simultaneous tasks
BX = index into TASK_IDS of current foreground task
CX = currently-active tasks
DX = version number (DL = major, DH = minor)
(DR-DOS 6.0 = 0001h, Novell DOS 7 = 0002h)
ES:SI -> TASK_IDS
ES:DI -> name table (array of 8-byte names, NUL-terminated if <8 chars)
Notes: do not attempt to create a new task if CX == AX
the task's index is its position on the task menu, while its ID is the
position within the internal task name table
SeeAlso: AX=2714h,AX=2716h
--------T-2F2702-----------------------------
INT 2F - DR-DOS 6.0 TaskMAX - GET PER-TASK EMS LIMIT
AX = 2702h
Return: DX = maximum pages INT 67/AH=42h will report available
Note: TaskMAX does not limit EMS allocations other than by limiting the
amount which is reported as being available at a given time
SeeAlso: AX=2703h,INT 67/AH=42h
--------T-2F2703-----------------------------
INT 2F - DR-DOS 6.0 TaskMAX - SET PER-TASK EMS LIMIT
AX = 2703h
DX = maximum pages INT 67/AH=42h should report available
Return: DX = new maximum for reporting
Note: the TaskMAX API is also supported by Novell DOS 7 TASKMGR in
taskswitching mode
SeeAlso: AX=2702h,INT 67/AH=42h
--------T-2F2704-----------------------------
INT 2F - DR-DOS 6.0 TaskMAX - REGISTER/UNREGISTER TASK MANAGER
AX = 2704h
DL = subfunction
00h unregister task manager
01h register task manager
Return: DL = status
00h registered
01h unregistered
Notes: a task manager replaces TaskMAX's menu system with its own user
interface; while one is registered, the TaskMAX hotkeys and
Ctrl-Alt-Del invoke the manager rather than the built-in menu system
unregister the task manager before terminating it
SeeAlso: AX=2705h
Index: hotkeys;TaskMAX
--------T-2F2705-----------------------------
INT 2F - DR-DOS 6.0 TaskMAX - ENABLE/DISABLE DIRECT SWITCHING
AX = 2705h
DL = subfunction
00h disable keystrokes for switching to next/prev/specified task
01h enable
Return: nothing
Note: should only be called by a registered task manager (see AX=2704h)
SeeAlso: AX=2704h,AX=2706h
--------T-2F2706-----------------------------
INT 2F - DR-DOS 6.0 TaskMAX - SWITCH TO SPECIFIED TASK
AX = 2706h
DX = task index (see AX=2701h) of task to be activated
Return: DX = task index of previously-active task
Note: the TaskMAX API is also supported by Novell DOS 7 TASKMGR in
taskswitching mode
SeeAlso: AX=2705h,AX=2707h,AX=2715h
--------T-2F2707-----------------------------
INT 2F - DR-DOS 6.0 TaskMAX - CREATE NEW TASK
AX = 2707h
DS:DX -> ASCIZ pathname of executable
ES:BX -> parameter block (see #1459)
CX = number of ticks before automatic return to task manager
(0000h = run until termination or explicitly switched)
Return: DX = new task's task index (FFFFh if task terminated)
SeeAlso: AX=2706h,AX=2708h
Format of TaskMAX parameter block:
Offset Size Description (Table 1459)
00h WORD reserved, should be 0000h
02h DWORD pointer to command tail to be copied into child's PSP
06h DWORD pointer to first FCB to be copied into child's PSP
0Ah DWORD pointer to second FCB to be copied into child's PSP
--------T-2F2708-----------------------------
INT 2F - DR-DOS 6.0 TaskMAX - DELETE TASK
AX = 2708h
DX = task index
Return: DX = FFFFh (task deleted)
Notes: this call should only be used for abnormal task termination, after
first checking for open files with AX=270Ch; should not be used
with programs that allocate EMS or XMS memory
switches to specified task first
SeeAlso: AX=2707h
--------T-2F2709-----------------------------
INT 2F - DR-DOS 6.0 TaskMAX - NAME TASK
AX = 2709h
DX = task index
DS:SI -> 8-byte name (8 NULs = remove name)
Return: AL = task flags
00h ID unused or task terminated
01h ID in use, task name table entry valid
81h ID in use, task name fixed
BX = task ID
ES:DI -> name in task name table (see AX=2701h)
Note: the task retains the given name until it terminates or the name is
removed by specifying a name of 8 NULs.
SeeAlso: AX=2701h,AX=2707h
--------T-2F270A-----------------------------
INT 2F - DR-DOS 6.0 TaskMAX - CONVERT TASK INDEX TO TASK ID
AX = 270Ah
DX = task index
Return: DX = task ID (FFFFh if index invalid)
Note: task IDs stay constant, while indexes can change when other tasks are
deleted
SeeAlso: AX=2701h,AX=270Bh
--------T-2F270B-----------------------------
INT 2F - DR-DOS 6.0 TaskMAX - CONVERT TASK ID TO TASK INDEX
AX = 270Bh
DX = task ID
Return: DX = task index (FFFFh if task not active)
Note: the TaskMAX API is also supported by Novell DOS 7 TASKMGR in
taskswitching mode
SeeAlso: AX=270Ah
--------T-2F270C-----------------------------
INT 2F - DR-DOS 6.0 TaskMAX - CHECK OPEN FILES
AX = 270Ch
DX = task index
Return: AX = number of files currently open for specified task
SeeAlso: AX=2708h
--------T-2F270D-----------------------------
INT 2F - DR-DOS 6.0 TaskMAX - CHECK IF TASK RUNNING PRIMARY COMMAND INTERPRETER
AX = 270Dh
DX = task index
Return: DX = status
0000h if primary command interpreter (COMMAND.COM, etc.) running
0001h if not in root shell for task
Note: TaskMAX will return 0001h if the specified task has spawned another
command interpreter with AX=2707h
SeeAlso: AX=2707h,AX=270Ch
--------T-2F270E-----------------------------
INT 2F - DR-DOS 6.0 TaskMAX - GET/SET TEXT PASTE LEAD-IN
AX = 270Eh
CX = length of string (max 15 keystrokes, 0000h to get current string)
DS:SI -> pasting lead-in string (character/scan-code pairs)
Return: ES:DI -> current lead-in string
Note: the specified sequence of keystrokes is sent to the application before
every line of a text-mode spreadsheet paste
SeeAlso: AX=270Fh,AX=2710h,AX=2713h
--------T-2F270F-----------------------------
INT 2F - DR-DOS 6.0 TaskMAX - GET/SET NUMERIC PASTE LEAD-IN
AX = 270Fh
CX = length of string (max 15 keystrokes, 0000h to get current string)
DS:SI -> pasting lead-in string (character/scan-code pairs)
Return: ES:DI -> current lead-in string
Note: the specified sequence of keystrokes is sent to the application before
every number in a numeric-mode spreadsheet paste
SeeAlso: AX=270Eh,AX=2710h,AX=2711h,AX=2713h
--------T-2F2710-----------------------------
INT 2F - DR-DOS 6.0 TaskMAX - GET/SET PASTE LINE TERMINATOR STRING
AX = 2710h
CX = length of string (max 15 keystrokes, 0000h to get current string)
DS:SI -> pasting terminator string (character/scan-code pairs)
Return: ES:DI -> current terminator string
Note: the specified sequence of keystrokes is sent to the application after
every line of a spreadsheet paste operation
SeeAlso: AX=270Eh,AX=270Fh,AX=2713h
--------T-2F2711-----------------------------
INT 2F - DR-DOS 6.0 TaskMAX - GET/SET NUMERIC PASTE DECIMAL POINT
AX = 2711h
DX = ASCII code for separator (FFFFh to get current)
Return: DL = current separator character
SeeAlso: AX=270Fh
--------T-2F2712-----------------------------
INT 2F - DR-DOS 6.0 TaskMAX - INITIATE EXPORTING TASK DATA
AX = 2712h
DX = task index
--------T-2F2713-----------------------------
INT 2F - DR-DOS 6.0 TaskMAX - INITIATE PASTE OPERATION
AX = 2713h
DX = task index
CX = paste mode
0000h alphanumeric
0001h numeric
0002h text
SeeAlso: AX=270Eh,AX=270Fh,AX=2710h,AX=2711h
--------T-2F2714-----------------------------
INT 2F - DR-DOS 6.0 TaskMAX - GET SWAP SPACE INFO
AX = 2714h
Return: CX = total KB of swap space
DX = available KB of swap space
SeeAlso: AX=2701h
--------T-2F2715-----------------------------
INT 2F - DR-DOS 6.0 TaskMAX - SWITCH TO TASK MANAGER
AX = 2715h
Return: only after calling task is again selected
SeeAlso: AX=2706h
--------T-2F2716-----------------------------
INT 2F - DR-DOS 6.0 TaskMAX - GET PASTE BUFFER STATUS
AX = 2716h
Return: AX = 0000h if AX=2716h,AX=2717h,AX=2718h supported
CX = bytes in paste buffer
DX = current generation number (updated after every copy operation)
SeeAlso: AX=2701h,AX=2713h,AX=2714h,AX=2717h,AX=2718h
--------T-2F2717-----------------------------
INT 2F - DR-DOS 6.0 TaskMAX - PASTE DATA DIRECTLY TO APPLICATION BUFFER
AX = 2717h
CX = bytes in destination buffer
ES:DI -> destination buffer
Return: AX = 0000h if function supported
CX = bytes actually copied (FFFFh if buffer too small)
DX = current generation number for paste buffer
Note: the destination buffer may be too small if another task adds more data
to the paste buffer after the AX=2716h call but before this call
SeeAlso: AX=2713h,AX=2716h,AX=2718h
--------T-2F2718-----------------------------
INT 2F - DR-DOS 6.0 TaskMAX - COPY DATA DIRECTLY INTO PASTE BUFFER
AX = 2718h
CX = bytes in source buffer
DS:SI -> source buffer (plain ASCII, lines terminated with CR LF)
Return: AX = 0000h if function supported
CX = bytes actually copied
DX = current generation number for paste buffer
SeeAlso: AX=2712h,AX=2716h,AX=2717h
--------T-2F2719-----------------------------
INT 2F - Novell DOS 7 TaskMGR - NOP
AX = 2719h to 271Bh
--------T-2F271C-----------------------------
INT 2F U - Novell DOS 7 TaskMGR - ???
AX = 271Ch
DX = ???
bit 0: ???
Return: ???
---if DX bit 0 set---
AX = 0031h
CX = 0000h
BUG: if the task switcher is running, and DX bit 0 is set on call, this
function will crash because its exit code attempts to pop several
registers which are not pushed when DX bit 0 is set
--------m-2F2780CL01-------------------------
INT 2F U - Novell DOS 7 - EMM386.EXE - MULTITASKING API
AX = 2780h
CL = 01h (function number)
CH = subfunction
00h unused
Return: CX = status (0002h) (see #1460)
01h unused
Return: CX = status (0002h) (see #1460)
02h ???
BX = ??? (0005h-000Fh)
Return: CX = status (0000h,0030h) (see #1460)
03h allocate ???
DX = ???
Return: CX = status (0000h,0003h) (see #1460)
04h get ???
Return: CX = 0000h (successful)
BX = selector for EMM386 data segment
EBX high word cleared
05h ???
EDX = ???
Return: ???
06h return to real mode via triple fault
07h debugger break
Note: calls INT 03, then INT 21/AH=02h to output a question
mark
08h get ???
Return: CX = 0000h (successful)
EBX = ??? (0 or 2)
09h ???
0Ah ???
0Bh unused
Return: CX = status (0002h) (see #1460)
0Ch ??? manipulates DOS memory chain
0Dh ???
EBX = ???
EDX = ???
Return: ???
0Eh ???
Return: CX = 0000h (successful)
BL = ??? \ or BX = 0000h
BH = ??? /
0Fh get ???
Return: CX = 0000h (successful)
EBX = ???
10h get and set ???
EDX = ???
Return: CX = 0000h (successful)
EBX = old value of ???
11h get ???
Return: CX = 0000h (successful)
EBX = ??? (0100h)
12h get and set ???
DX = ???
Return: CX = 0000h (successful)
AX = old value of ???
13h ???
Return: CX = status (0000h,003Fh) (see #1460)
AX = ???
14h ???
EDX = ???
Return: CX = status (0000h,003Fh) (see #1460)
15h ???
BX = segment of ???
Return: CX = 0000h (successful)
BX = segment of ???
16h ???
17h ???
EBX = subfunction (0-2)
Return: CX = status (0002h if EBX>2) (see #1460)
???
18h unused
Return: CX = status (0002h) (see #1460)
Return: CX = status (most subfunctions)
(E)AX and/or (E)BX contain return values, depending on function
Notes: called by DPMS.EXE and EMM386.EXE
this API is only available if AX=12FFh/BX=0EDCh returns successfully;
because the request is handled on the initial trap to the memory
manager caused by INT instructions, this API must be invoked with
an actual INT 2F instruction instead of some simulation such as a
far call to the address in the interrupt vector table
SeeAlso: AX=12FF/BX=0EDCh,AX=2780h/CL=02h,AX=2780h/CL=03h,AX=2780h/CL=04h
(Table 1460)
Values for Novell DOS 7 EMM386 function status:
0000h successful
0001h invalid function???
0002h invalid subfunction
0003h ???
0004h invalid ??? index
0005h ???
0006h ???
0007h ???
0009h ???
000Ah ???
000Bh invalid ??? handle
000Ch ???
000Dh ???
000Eh ???
000Fh ???
0014h ???
0023h ???
0030h ???
003Fh ???
--------m-2F2780CL02-------------------------
INT 2F U - Novell DOS 7 - EMM386.EXE - MULTITASKING API
AX = 2780h
CL = 02h (function number)
CH = subfunction
00h ???
???
Return: CX = status (0000h,0023h, others???) (see #1460)
BX = ??? (0000h if CX=0000h, FFFFh if CX=0023h)
Note: calls func 04h/sf 03h, func 04h/sf 1Eh,func 02h/sf 43h,
func 02h/sf 0Bh, and func 04h/sf 01h
01h get and clear ???
DX = ??? handle or 0000h for default
Return: CX = status (0000h,000Bh) (see #1460)
EBX = old value of ??? if successful
EDX destroyed
02h ???
DX = index of ???
Return: CX = status (0000h,0004h,0005h) (see #1460)
EBX = 0000FFFFh on error, 00000000h if successful
03h ???
DX = index of ???
Return: CX = status (0000h,0004h,0006h) (see #1460)
BX = FFFFh on error, 0000h if successful
04h ???
Return: CX = status (0000h,0007h,000Ah) (see #1460)
05h ???
EDX -> ??? data (first 8 bytes seem to be name)
Return: CX = status (0000h,0009h,000Dh) (see #1460)
06h ???
Note: calls fn 02h/subfn 05h, then fn 02h/subfn 40h
07h ???
EDX = ???
Return: CX = status (0000h,0009h,000Eh) (see #1460)
08h ???
EDX = ???
Return: CX = status (0000h,0009h,000Eh) (see #1460)
09h ???
EDX = ???
Return: CX = status (0000h,0009h,000Fh) (see #1460)
0Ah ???
EDX = ???
Return: CX = status (0000h,0009h,000Fh) (see #1460)
0Bh ???
DX = ???
Return: CX = 0000h (successful)
0Ch ???
Return: CX = 0000h (successful)
0Dh ???
Return: CX = status (0000h,0023h) (see #1460)
BX = FFFFh on error, 0000h if successful
Note: calls fn 04h/subfn 03h, fn 04h/subfn 1Eh,
fn 02h/subfn 43h, fn 02h/subfn 0Bh, fn 04h/sub 01h
0Eh ???
???
Return: CX = status (0000h,000Ch) (see #1460)
EBX = ??? if successful
0Fh ???
BX = ???
DX = ??? handle or 0000h for default
Return: CX = status (0000h,000Bh) (see #1460)
10h get ??? handle
Return: CX = 0000h (successful)
BX = handle of default ???
EBX high word cleared
11h ???
DX = ??? handle or 0000h for default
BX = ??? (handle???)
Return: CX = status (0000h,000Bh,0014h) (see #1460)
12h ???
BX = ???
DX = ???
Return: CX = 0000h (successful)
13h ???
DX = ???
Return: CX = status (see #1460)
14h ???
BX = ???
DX = ???
Return: CX = status (0000h,0014h) (see #1460)
BX = FFFFh on error, ??? if successful
15h set ??? flags
BX = ??? (low two bits only)
DX = ??? handle or 0000h for default
Return: CX = status (0000h,000Bh) (see #1460)
BX = new value of ??? flags (entire word)
EBX high register cleared
16h clear ??? flag for default ???
Return: CX = 0000h (successful)
17h ???
18h ???
19h ???
1Ah ???
1Bh ???
1Ch ???
1Dh ???
1Eh ???
1Fh ???
20h ???
21h ???
22h ???
23h ???
24h ???
25h ???
26h ???
27h ???
28h ???
29h ???
2Ah ???
2Bh ???
2Ch ???
2Dh ???
2Eh ???
2Fh ???
30h ???
31h ???
32h ???
33h ???
34h ???
35h ???
36h ???
37h ???
38h ???
39h ???
3Ah ???
3Bh ???
3Ch ???
3Eh ???
3Fh ???
40h ???
41h ???
42h ???
43h ???
44h ???
45h ???
46h ???
47h ???
Return: CX = status (most subfunctions)
(E)AX and/or (E)BX contain return values, depending on function
Notes: called by DPMS.EXE and EMM386.EXE
this API is only available if AX=12FFh/BX=0EDCh returns successfully;
because the request is handled on the initial trap to the memory
manager caused by INT instructions, this API must be invoked with
an actual INT 2F instruction instead of some simulation such as a
far call to the address in the interrupt vector table
SeeAlso: AX=12FF/BX=0EDCh,AX=2780h/CL=01h,AX=2780h/CL=03h,AX=2780h/CL=04h
--------m-2F2780CL03-------------------------
INT 2F U - Novell DOS 7 - EMM386.EXE - MULTITASKING API
AX = 2780h
CL = 03h (function number)
CH = subfunction
00h ???
01h ???
02h ???
03h ???
04h ???
05h ???
06h ???
07h ???
08h ???
09h ???
0Ah ???
0Bh ???
0Ch ???
0Dh ???
0Eh ???
0Fh ???
10h ???
11h ???
12h ???
13h ???
14h ???
15h ???
16h ???
17h ???
18h ???
19h ???
1Ah ???
1Bh ???
1Ch ???
1Dh ???
1Eh ???
1Fh ???
20h ???
21h ???
22h ???
23h ???
24h ???
25h ???
26h ???
27h ???
28h ???
29h ???
2Ah ???
2Bh ???
2Ch ???
2Dh ???
2Eh ???
2Fh ???
30h ???
31h ???
32h ???
33h ???
34h ???
35h ???
36h ???
37h ???
Return: CX = status (most subfunctions)
(E)AX and/or (E)BX contain return values, depending on function
Notes: called by DPMS.EXE and EMM386.EXE
this API is only available if AX=12FFh/BX=0EDCh returns successfully;
because the request is handled on the initial trap to the memory
manager caused by INT instructions, this API must be invoked with
an actual INT 2F instruction instead of some simulation such as a
far call to the address in the interrupt vector table
SeeAlso: AX=12FF/BX=0EDCh,AX=2780h/CL=01h,AX=2780h/CL=02h,AX=2780h/CL=04h
--------m-2F2780CL04-------------------------
INT 2F U - Novell DOS 7 - EMM386.EXE - MULTITASKING API
AX = 2780h
CL = 04h (function number)
CH = subfunction
00h ???
01h ???
02h ???
03h ???
04h ???
05h ???
06h ???
07h ???
08h ???
09h ???
0Ah ???
0Bh ???
0Ch ???
0Dh ???
0Eh ???
0Fh ???
10h ???
11h ???
12h ???
13h ???
14h ???
15h ???
16h ???
17h ???
18h ???
19h ???
1Ah ???
1Bh ???
1Ch ???
1Dh ???
1Eh ???
1Fh ???
20h ???
21h ???
22h ???
23h ???
24h ???
25h ???
26h ???
27h ???
28h ???
29h ???
2Ah ???
2Bh ???
2Ch ???
2Dh ???
2Eh ???
2Fh ???
30h ???
31h ???
32h ???
Return: CX = status (most subfunctions)
(E)AX and/or (E)BX contain return values, depending on function
Notes: called by DPMS.EXE and EMM386.EXE
this API is only available if AX=12FFh/BX=0EDCh returns successfully;
because the request is handled on the initial trap to the memory
manager caused by INT instructions, this API must be invoked with
an actual INT 2F instruction instead of some simulation such as a
far call to the address in the interrupt vector table
SeeAlso: AX=12FF/BX=0EDCh,AX=2780h/CL=01h,AX=2780h/CL=02h,AX=2780h/CL=03h
--------m-2F2780CL05-------------------------
INT 2F U - Novell DOS 7 - EMM386.EXE - MULTITASKING API
AX = 2780h
CL = 05h
???
Return: ???
Notes: called by DPMS.EXE and EMM386.EXE
the handler for this function may be set by one of the subfunctions
of AX=2780h/CL=01h; the default handler returns AX=BX=FFFFh and
CX=0001h (see #1460)
this API is only available if AX=12FFh/BX=0EDCh returns successfully;
because the request is handled on the initial trap to the memory
manager caused by INT instructions, this API must be invoked with
an actual INT 2F instruction instead of some simulation such as a
far call to the address in the interrupt vector table
SeeAlso: AX=12FF/BX=0EDCh,AX=2780h/CL=01h,AX=2780h/CL=02h,AX=2780h/CL=03h
--------m-2F2780CL06-------------------------
INT 2F U - Novell DOS 7 - EMM386.EXE - MULTITASKING API
AX = 2780h
CL = 06h
???
Return: ???
Notes: called by DPMS.EXE and EMM386.EXE
the handler for this function may be set by one of the subfunctions
of AX=2780h/CL=01h; the default handler returns AX=BX=FFFFh and
CX=0001h (see #1460)
this API is only available if AX=12FFh/BX=0EDCh returns successfully;
because the request is handled on the initial trap to the memory
manager caused by INT instructions, this API must be invoked with
an actual INT 2F instruction instead of some simulation such as a
far call to the address in the interrupt vector table
SeeAlso: AX=12FF/BX=0EDCh,AX=2780h/CL=01h,AX=2780h/CL=02h,AX=2780h/CL=03h
--------m-2F2780-----------------------------
INT 2F U - Novell DOS 7 - EMM386.EXE - MULTITASKING API
AX = 2780h
CL = function (07h-0Fh)
???
Return: ???
Notes: called by DPMS.EXE and EMM386.EXE
the handlers for each of these functions may be set individually by
one of the subfunctions of AX=2780h/CL=01h; the default handlers
return with all registers unchanged
this API is only available if AX=12FFh/BX=0EDCh returns successfully;
because the request is handled on the initial trap to the memory
manager caused by INT instructions, this API must be invoked with
an actual INT 2F instruction instead of some simulation such as a
far call to the address in the interrupt vector table
SeeAlso: AX=12FF/BX=0EDCh,AX=2780h/CL=01h,AX=2780h/CL=02h,AX=2780h/CL=03h
--------T-2F2781-----------------------------
INT 2F U - Novell DOS 7 TaskMGR - BEGIN CRITICAL SECTION???
AX = 2781h
Return: ???
SeeAlso: AX=2782h
--------T-2F2782-----------------------------
INT 2F U - Novell DOS 7 TaskMGR - END CRITICAL SECTION???
AX = 2782h
Return: ???
SeeAlso: AX=2781h
--------m-2F2783-----------------------------
INT 2F U - Novell DOS 7 - EMM386.EXE - GET ???
AX = 2783h
Return: AX = ???
BX = ???
--------T-2F278F-----------------------------
INT 2F U - Novell DOS 7 TaskMGR - ??? API
AX = 278Fh
as for INT 2F/AX=2780h
Return: as for INT 2F/AX=2780h
Note: Novell DOS 7 TaskMGR passes this call through to INT 2F/AX=2780h
without changing any other registers
SeeAlso: AX=2780h,AX=2782h
--------F-2F2A-------------------------------
INT 2F - Gammafax DOS Dispatcher INTERFACE
AH = 2Ah
Note: details not available at this time
SeeAlso: AX=8000h"FaxBIOS",AX=C000h/BX=444Bh,AX=CB00h,AX=CBDDh,INT 66"BitFax"
--------V-2F2E00-----------------------------
INT 2F U - Novell DOS 7 - GRAFTABL - INSTALLATION CHECK
AX = 2E00h
Return: AH = FFh if installed
Note: this installation check does not follow the usual format of setting
AL to FFh
SeeAlso: AX=2300h,AH=2Eh"GRAFTABL"
--------V-2F2E-------------------------------
INT 2F U - Novell DOS 7 - GRAFTABL - GET FONT TABLE
AH = 2Eh
AL nonzero
Return: AH = FFh if installed
ES:BX -> graphics data (8 bytes per character from 80h to FFh)
SeeAlso: AX=2E00h,AH=23h"GRAFTABL"
--------t-2F3900-----------------------------
INT 2F - Kingswood TSR INTERFACE - COMPATIBILITY MODE
AX = 3900h
Return: AL = status
00h not installed
FFh one or more TSRs using this interface is installed
DX may be destroyed
Note: this function is provided to that the multiplex number will appear used
to other programs
SeeAlso: AH=39h/BL=00h
--------t-2F39--BL00-------------------------
INT 2F - Kingswood TSR INTERFACE - INSTALLATION CHECK
AH = 39h
BL = 00h
AL = TSR ID number (01h-FFh, currently only 01h-1Bh used) (see #1461)
Return: AL = status
00h not installed
FFh installed
DX = segment address of resident module
Note: All of Kingswood Software's TSRs use this interface. Usually the
resident module is installed by allocating a block of upper memory,
setting its owner ID to 000Ah (used by DOS), and filling the MCB name
field with the TSR's name.
SeeAlso: #1462,AX=3900h,AH=39h/BL=01h
(Table 1461)
Values for Kingswood TSR ID number:
01h TSR Windows
02h NOBUSY
03h CD STACK
04h DISK WATCH
05h PUSHBP
06h ALIAS
07h KEYMACRO
08h SLOWDOWN
09h ANSIGRAB
0Ah TEE
0Bh FASTMOUS
0Ch EXTWILD
0Dh BREAKOUT
0Eh STOPDISK
0Fh MEMINIT
10h JANUSEXT
11h CAPS
12h ANSI
13h TRAPPER
14h EATMEM
15h WPJOKE
16h SHOWDOS
17h LOGINTS
18h BLANKVGA
19h SWAPEXEC
1Ah SHELL
1Bh TSRGAMES
Format of Kingswood TSR modules:
Offset Size Description (Table 1462)
00h 4 BYTEs signature "FTSR"
04h WORD segment address of this module (used to check validity)
06h WORD number of words to skip (usually 0000h if no PSP present)
08h N WORDs module-defined data that must be at a fixed segment offset
(usually only a PSP if file access is required)
5N BYTEs interrupt list (see #1463)
BYTE FFh terminator
Format of Kingswood TSR interrupt list entry:
Offset Size Description (Table 1463)
00h BYTE interrupt number (00h-FEh)
01h WORD offset within segment of DWORD pointer to previous interrupt
03h WORD offset within segment of begin of interrupt handler code
--------t-2F39--BL01-------------------------
INT 2F - Kingswood TSR INTERFACE - REMOVAL CHECK
AH = 39h
BL = 01h
AL = TSR ID number (01h-FFh) (see #1461)
Return: AL = status
00h not ready to be removed
FFh resident module may be removed by deassigning the interrupts
hooked by the TSR and deallocating the TSR's memory block
AH,BX,CX,DX,ES may be destroyed
SeeAlso: AX=3900h,AH=39h/BL=00h
--------t-2F39-------------------------------
INT 2F - Kingswood TSR INTERFACE - APPLICATION-SPECIFIC FUNCTION CALLS
AH = 39h
BL = function number (02h-FFh)
AL = TSR ID number (01h-FFh) (see #1461)
CX,DX,SI,DI,DS,ES may contain parameters
BH reserved for use by the function dispatcher
Return: as appropriate for the called function
SeeAlso: AX=3900h,AH=39h/BL=00h,AX=3901h/BL=02h
--------r-2F3901BL02-------------------------
INT 2F - Kingswood TSR Windows - OPEN WINDOW
AX = 3901h
BL = 02h
Return: AX = error code (0000h if successful)
SI,DI,DS,ES preserved
Notes: opens the next TSR window on top of any others. Only three
TSR windows can be opened at any one time. The three windows
are all 40x11 characters, partly overlapping.
SeeAlso: AH=39h/BL=00h,AX=3901h/BL=03h,AX=3901h/BL=05h,AX=3901h/BL=06h
--------r-2F3901BL03-------------------------
INT 2F - Kingswood TSR Windows - HIDE WINDOWS
AX = 3901h
BL = 03h
Return: AX = error code (0000h if successful)
SI,DI,DS,ES preserved
Notes: Hide any visible TSR windows from view.
SeeAlso: AH=39h/BL=00h,AX=3901h/BL=02h,AX=3901h/BL=05h
--------r-2F3901BL04-------------------------
INT 2F - Kingswood TSR Windows - SHOW WINDOWS
AX = 3901h
BL = 04h
Return: AX = error code (0000h if successful)
SI,DI,DS,ES preserved
Notes: Re-display all TSR windows after a HIDE WINDOWS call.
SeeAlso: AH=39h/BL=00h,AX=3901h/BL=02h,AX=3901h/BL=03h
--------r-2F3901BL05-------------------------
INT 2F - Kingswood TSR Windows - CLOSE WINDOW
AX = 3901h
BL = 05h
Return: AX = error code (0000h if successful)
SI,DI,DS,ES preserved
Notes: Close the last opened TSR window.
SeeAlso: AH=39h/BL=00h,AX=3901h/BL=02h
--------r-2F3901BL06-------------------------
INT 2F - Kingswood TSR Windows - SET WINDOW TITLE
AX = 3901h
BL = 06h
DS:SI -> title string
Return: AX = error code (0000h if successful)
SI,DI,DS,ES preserved
SeeAlso: AH=39h/BL=00h,AX=3901h/BL=02h
--------r-2F3901BL07-------------------------
INT 2F - Kingswood TSR Windows - POSITION CURSOR
AX = 3901h
BL = 07h
CH = Y coordinate (0-10)
CL = X coordinate (0-39)
Return: AX = error code (0000h if successful)
SI,DI,DS,ES preserved
Note: the hardware cursor is always disabled when a TSR window is opened;
this call only sets a text position
SeeAlso: AH=39h/BL=00h,AX=3901h/BL=08h,AX=3901h/BL=09h
--------r-2F3901BL08-------------------------
INT 2F - Kingswood TSR Windows - DISPLAY STRING
AX = 3901h
BL = 08h
DS:SI -> string
Return: AX = error code (0000h if successful)
SI,DI,DS,ES preserved
Notes: The text is not clipped.
This routine understands Tab, NewLine and Carriage Return
SeeAlso: AH=39h/BL=00h,AX=3901h/BL=07h
--------r-2F3901BL09-------------------------
INT 2F - Kingswood TSR Windows - SCROLL WINDOW
AX = 3901h
BL = 09h
CL = scroll direction: 01h up, FFh down, 00h clear window
Return: AX = error code (0000h if successful)
SI,DI,DS,ES preserved
SeeAlso: AH=39h/BL=00h,AX=3901h/BL=07h
--------r-2F3901BL0A-------------------------
INT 2F - Kingswood TSR Windows - SOUND BEEPER
AX = 3901h
BL = 0Ah
DX = sound divisor, or 0 for silence.
(divide 1843200 by required frequency to get value for DX)
CL = sound length in 18.2 Hz clock ticks
Return: AX = error code (0000h if successful)
SI,DI,DS,ES preserved
SeeAlso: AH=39h/BL=00h
--------r-2F3901BL0B-------------------------
INT 2F - Kingswood TSR Windows - ADD OR REMOVE USER
AX = 3901h
BL = 0Bh
CL = number of users increment: +1 if adding a new user
-1 if removing a user
Return: AX = error code (0000h if successful)
SI,DI,DS,ES preserved
Note: the TSR windows resident module may only be removed when the internal
user count is zero
SeeAlso: AH=39h/BL=00h,AX=3901h/BL=02h
--------V-2F3912BL03-------------------------
INT 2F - Kingswood ANSI display driver - SET COMPATIBILITY MODE
AX = 3912h
BL = 03h
CL = new mode (00h fast, FFh BIOS)
Return: AL = old compatibility mode
SI,DI,DS,ES preserved
SeeAlso: AX=3900h,AX=3912h/BL=04h
--------V-2F3912BL04-------------------------
INT 2F - Kingswood ANSI display driver - SET FLAGS
AX = 3912h
BL = 04h
CL = new flags (see #1464)
Return: AL = old flags
SI,DI,DS,ES preserved
SeeAlso: AX=3900h,AX=3912h/BL=03h
Bitfields for Kingswood ANSI flags:
Bit(s) Description (Table 1464)
0 do not wrap at end of line
1 wait for beeps to end before displaying next character
2 do not use graphics cursor
--------W-2F4000-----------------------------
INT 2F - Windows 3.x (OS/2 2.x???) - GET VIRTUAL DEVICE DRIVER (VDD) CAPABLTIES
AX = 4000h
Return: AL = video virtualization (see #1465)
Note: this function is used by display drivers to find out what capabilities
exist for the VDD driver and also trigger the VDD driver to call
functions 4005h and 4006h. This function also gives the Video Driver
hardware access to the video registers.
(Table 1465)
Values for Windows video virtualization:
01h does not virtualize video access
02h virtualizes the video when in text mode
03h virtualizes the video when in text mode or single plane graphics modes
04h virtualizes the video when in text mode, single plane graphics modes,
and VGA multiplane modes
FFh virtualizes the video fully
--------O-2F4001-----------------------------
INT 2F C - OS/2 compatibility box - SWITCHING DOS TO BACKGROUND
AX = 4001h
Note: called by OS/2 when the DOS box is about to be placed in the background
and the video driver should save any necessary state
SeeAlso: AX=4002h,AX=4005h
--------O-2F4002-----------------------------
INT 2F C - OS/2 compatibility box - SWITCHING DOS TO FOREGROUND
AX = 4002h
Note: called by OS/2 when the DOS box is about to be placed in the foreground
and the video driver should restore the previously-saved state
SeeAlso: AX=4001h,AX=4006h
--------W-2F4003-----------------------------
INT 2F - Windows 3.x - ENTERING VIDEO DRIVER CRITICAL SECTION
AX = 4003h
Note: This critical section must be exited within 1 second.
SeeAlso: AX=4004h
--------W-2F4004-----------------------------
INT 2F - Windows 3.x - EXITING VIDEO DRIVER CRITICAL SECTION
AX = 4004h
SeeAlso: AX=4003h
--------W-2F4005-----------------------------
INT 2F C - Windows 3.x - SWITCHING DOS TO BACKGROUND
AX = 4005h
Note: called by Windows when the DOS box is about to be placed in the
background and the video driver should save any necessary state
information (this may be called only in Standard mode)
SeeAlso: AX=4001h,AX=4006h
--------W-2F4006-----------------------------
INT 2F C - Windows 3.x - SWITCHING DOS TO FOREGROUND
AX = 4006h
Note: called by Windows when the DOS box is about to be placed in the
foreground and the video driver should restore any necessary state
information (this may be called only in Standard mode)
SeeAlso: AX=4002h,AX=4005h
--------W-2F4007-----------------------------
INT 2F - Windows 3.x - ENABLE VDD TRAPPING OF VIDEO REGISTERS
AX = 4007h
Note: used by Windows Standard mode
--------O-2F4010-----------------------------
INT 2F - OS/2 v2.0+ - INSTALLATION CHECK / GET VERSION
AX = 4010h
Return: AX = 4010h if OS/2 not installed
AX = 0000h for OS/2 Warp 3.0
BX = OS/2 version if installed
Note: OS/2 Warp 3.0
SeeAlso: INT 21/AH=30h,INT 21/AX=3306h
--------E-2F4040-----------------------------
INT 2F - PharLap 286|DOS-Extender Lite v2.5 - ???
AX = 4040h
Return: BX:CX -> ???
--------N-2F4100-----------------------------
INT 2F - DOS Enhanced LAN Manager 2.0+ MINIPOP/NETPOPUP - INSTALLATION CHECK
AX = 4100h
Return: CF clear if successful
AL = FFh
CF set on error
AX = ???
Notes: MINIPOP and NETPOPUP provide a network message popup service
LAN Manager enhanced mode adds features beyond the standard redirector
file/printer services
SeeAlso: AX=118Ah,AX=4103h,AX=4104h,AH=42h,AH=4Bh
--------N-2F4103-----------------------------
INT 2F - DOS Enhanced LAN Manager 2.0+ MINIPOP/NETPOPUP - ???
AX = 4103h
Return: ???
SeeAlso: AX=4100h,AX=4104h
--------N-2F4104-----------------------------
INT 2F - DOS Enhanced LAN Manager 2.0+ MINIPOP/NETPOPUP - ???
AX = 4104h
Return: ???
SeeAlso: AX=4100h,AX=4103h
--------N-2F42-------------------------------
INT 2F - LAN Manager 2.0 DOS Enhanced MSRV.EXE - MESSENGER SERVICE
AH = 42h
???
Return: ???
Note: LAN Manager enhanced mode adds features beyond the standard redirector
file/printer services
SeeAlso: AX=118Ah,AX=4100h,AH=4Bh
--------m-2F4300-----------------------------
INT 2F - EXTENDED MEMORY SPECIFICATION (XMS) v2+ - INSTALLATION CHECK
AX = 4300h
Return: AL = 80h XMS driver installed
AL <> 80h no driver
Notes: XMS gives access to extended memory and noncontiguous/nonEMS memory
above 640K
this installation check DOES NOT follow the format used by other
software
SeeAlso: AX=4310h
Index: installation check;XMS version 2+
--------m-2F4308-----------------------------
INT 2F U - HIMEM.SYS v2.77+ - GET A20 HANDLER NUMBER
AX = 4308h
Return: AL = 43h if supported
BL = A20 handler number (value of /MACHINE:nn switch)
BH = AT A20 switch time (00h medium, 01h fast, 02h slow)
Note: if the A20 handler number returned in BL is 00h, an external handler
is being used (see AX=4330h)
SeeAlso: AX=4309h,AX=4330h
--------m-2F4309-----------------------------
INT 2F U - HIMEM.SYS v3.09+ - GET XMS HANDLE TABLE
AX = 4309h
Return: AL = 43h if function supported
ES:BX -> XMS handle table (see #1466)
Note: HIMEM.SYS v3.09 is part of MS-DOS 6.0.
SeeAlso: AX=4308h
Format of XMS handle table:
Offset Size Description (Table 1466)
00h BYTE ??? (01h in HIMEM.SYS v3.09)
01h BYTE size of one handle descriptor
02h WORD number of handles (default = 20h)
04h DWORD pointer to XMS handle array (see #1467)
SeeAlso: #1496
Format of XMS handle descriptor [array]:
Offset Size Description (Table 1467)
00h BYTE flag
01h=free, 02h=used, 04h=in pool but not associated with any EMB
01h BYTE lock count (00h=unlocked)
02h DWORD address of XMS block in KB (shift left by 10 for abs. address)
06h DWORD size of XMS block in KB
--------m-2F4310-----------------------------
INT 2F - EXTENDED MEMORY SPECIFICATION (XMS) v2+ - GET DRIVER ADDRESS
AX = 4310h
Return: ES:BX -> driver entry point (see #1468,#1469,#1472,#1479,#1488,#1493)
Notes: HIMEM.SYS v2.77 chains to previous handler if AH is not 00h or 10h
HIMEM.SYS requires at least 256 bytes free stack space when calling
the driver entry point
SeeAlso: AX=4300h,AX=4310h"Cloaking",AX=4310h"Netroom"
Format of XMS driver entry point:
Offset Size Description (Table 1468)
00h 5 BYTEs jump to actual handler
either short jump (EBh XXh) followed by three NOPs or
far jump (EAh XXXX:XXXX) to a program which has hooked itself
into the XMS driver chain
Note: to hook into the XMS driver chain, a program should follow the chain of
far jumps until it reaches the short jump of the driver at the end
of the chain; this short jump is to be replaced with a far jump to
the new handler's entry point, which should contain a short jump
followed by three NOPs. The new handler must return to the address
pointed at by the short jump which was overwritten. Using this
method, the new handler becomes the first to see every XMS request.
(Table 1469)
Call the XMS driver "Get XMS version number" function with:
AH = 00h
Return: AX = XMS version (in BCD, AH=major, AL=minor)
BX = internal revision number (in BCD for HIMEM.SYS)
DX = High Memory Area (HMA) state
0001h HMA (1M to 1M + 64K) exists
0000h HMA does not exist
SeeAlso: #1470,#1471,#1476,#1477,#1483
(Table 1470)
Call the XMS driver "Request High Memory Area" function with:
AH = 01h
DX = memory in bytes (for TSR or device drivers)
FFFFh if application program
Return: AX = status
0001h success
0000h failure
BL = error code (80h,81h,90h,91h,92h) (see #1494)
Note: HIMEM.SYS will fail function 01h with error code 91h if AL=40h and
DX=KB free extended memory returned by last call of function 08h
SeeAlso: #1471,#1503
(Table 1471)
Call the XMS driver "Release High Memory Area" function with:
AH = 02h
Return: AX = status
0001h success
0000h failure
BL = error code (80h,81h,90h,93h) (see #1494)
SeeAlso: #1470
(Table 1472)
Call the XMS driver "Global enable A20, for using the HMA" function with:
AH = 03h
Return: AX = status
0001h success
0000h failure
BL = error code (80h,81h,82h) (see #1494)
SeeAlso: #1473,#1474
(Table 1473)
Call the XMS driver "Global disable A20" function with:
AH = 04h
Return: AX = status
0001h success
0000h failure
BL = error code (80h,81h,82h,94h) (see #1494)
SeeAlso: #1472,#1475
(Table 1474)
Call the XMS driver "Local enable A20" function with:
AH = 05h
Return: AX = status
0001h success
0000h failure
BL = error code (80h,81h,82h) (see #1494)
Note: this function is used for direct access to extended memory
SeeAlso: #1472,#1475
(Table 1475)
Call the XMS driver "Local disable A20" function with:
AH = 06h
Return: AX = status
0001h success
0000h failure
BL = error code (80h,81h,82h,94h) (see #1494)
SeeAlso: #1473,#1474
(Table 1476)
Call the XMS driver "Query A20 state" function with:
AH = 07h
Return: AX = status
0001h enabled
0000h disabled
BL = error code (00h,80h,81h) (see #1494)
SeeAlso: #1469,#1477
(Table 1477)
Call the XMS driver "Query free extended memory" function with:
AH = 08h
BL = 00h (some implementations leave BL unchanged on success)
Return: AX = size of largest extended memory block in KB
DX = total extended memory in KB
BL = error code (00h,80h,81h,A0h) (see #1494)
Note: this function does not include the HMA in the returned memory sizes
SeeAlso: #1469,#1476,#1478,#1490
(Table 1478)
Call the XMS driver "Allocate extended memory block" function with:
AH = 09h
DX = Kbytes needed
Return: AX = status
0001h success
DX = handle for memory block
0000h failure
BL = error code (80h,81h,A0h) (see #1494)
SeeAlso: #1477,#1480,#1483,#1484,#1485,#1491
(Table 1479)
Call the XMS driver "Free extended memory block" function with:
AH = 0Ah
DX = handle of block to free
Return: AX = status
0001h success
0000h failure
BL = error code (80h,81h,A2h,ABh) (see #1494)
SeeAlso: #1478,#1491
(Table 1480)
Call the XMS driver "Move extended memory block" function with:
AH = 0Bh
DS:SI -> EMM structure (see #1495)
Return: AX = status
0001h success
0000h failure
BL = error code (80h-82h,A3h-A9h) (see #1494)
Note: if either handle in the EMM structure is 0000h, the corresponding
offset is considered to be an absolute segment:offset address in
directly addressable memory
SeeAlso: #1478,#1481
(Table 1481)
Call the XMS driver "Lock extended memory block" function with:
AH = 0Ch
DX = handle of block to lock
Return: AX = status
0001h success
DX:BX = 32-bit linear address of locked block
0000h failure
BL = error code (80h,81h,A2h,ACh,ADh) (see #1494)
Note: MS Windows 3.x rejects this function for handles allocated after
Windows started
SeeAlso: #1478,#1480,#1482
(Table 1482)
Call the XMS driver "Unlock extended memory block" function with:
AH = 0Dh
DX = handle of block to unlock
Return: AX = status
0001h success
0000h failure
BL = error code (80h,81h,A2h,AAh) (see #1494)
SeeAlso: #1481
(Table 1483)
Call the XMS driver "Get handle information" function with:
AH = 0Eh
DX = handle for which to get info
Return: AX = status
0001h success
BH = block's lock count
BL = number of free handles left
DX = block size in KB
0000h failure
BL = error code (80h,81h,A2h) (see #1494)
BUG: MS Windows 3.10 acts as though unallocated handles are in use
Note: MS Windows 3.00 has problems with this call
SeeAlso: #1469,#1478,#1492
(Table 1484)
Call the XMS driver "Reallocate extended memory block" function with:
AH = 0Fh
DX = handle of block
BX = new size of block in KB
Return: AX = status
0001h success
0000h failure
BL = error code (80h,81h,A0h-A2h,ABh) (see #1494)
SeeAlso: #1478,#1487
(Table 1485)
Call the XMS driver "Request upper memory block" function with:
AH = 10h
DX = size of block in paragraphs
Return: AX = status
0001h success
BX = segment address of UMB
DX = actual size of block
0000h failure
BL = error code (80h,B0h,B1h) (see #1494)
DX = largest available block
Notes: Upper Memory consists of non-EMS memory between 640K and 1024K
the XMS driver need not implement functions 10h through 12h to be
considered compliant with the standard
SeeAlso: #1478,#1486,#1504
(Table 1486)
Call the XMS driver "Release upper memory block" function with:
AH = 11h
DX = segment address of UMB to release
Return: AX = status
0001h success
0000h failure
BL = error code (80h,B2h) (see #1494)
Note: the XMS driver need not implement functions 10h through 12h to be
considered compliant with the standard
SeeAlso: #1479,#1485,#1487
(Table 1487)
Call the XMS v3.0+ driver "Reallocate upper memory block" function with:
AH = 12h
DX = segment address of UMB to resize
BX = new size of block in paragraphs
Return: AX = status
0001h success
0000h failure
BL = error code (80h,B0h,B2h) (see #1494)
DX = maximum available size (RM386)
Note: the XMS driver need not implement functions 10h through 12h to be
considered compliant with the standard
SeeAlso: #1484,#1485,#1486,#1502
(Table 1488)
Call the QEMM v5.11 "???" function with:
AH = 34h (QEMM 5.11 only, undocumented)
???
Return: ???
SeeAlso: #1489
(Table 1489)
Call the QEMM v5.11 "???" function with:
AH = 44h (QEMM 5.11 only, undocumented)
???
Return: ???
SeeAlso: #1488,#1502
(Table 1490)
Call the XMS v3.0 driver "Query free extended memory" function with:
AH = 88h
Return: EAX = largest block of extended memory, in KB
BL = status (00h,80h,81h,A0h) (see #1494)
ECX = physical address of highest byte of memory
(valid even on error codes 81h and A0h)
EDX = total Kbytes of extended memory (0 if status A0h)
BUG: HIMEM v3.03-3.07 crash on an 80286 machine if any of the 8Xh functions
are called
SeeAlso: #1477,#1491
(Table 1491)
Call the XMS v3.0 driver "Allocate any extended memory" function with:
AH = 89h
EDX = Kbytes needed
Return: AX = status
0001h success
DX = handle for allocated block (free with AH=0Ah) (see #1479)
0000h failure
BL = status (80h,81h,A0h,A1h,A2h) (see #1494)
SeeAlso: #1478,#1490
(Table 1492)
Call the XMS v3.0 driver "Get extended EMB handle information" function with:
AH = 8Eh
DX = handle
Return: AX = status
0001h success
BH = block's lock count
CX = number of free handles left
EDX = block size in KB
0000h failure
BL = status (80h,81h,A2h) (see #1494)
BUG: MS-DOS 6.0 HIMEM.SYS leaves CX unchanged
SeeAlso: #1483,#1491,#1493
(Table 1493)
Call the XMS v3.0 driver "Reallocate any extended memory block" function with:
AH = 8Fh
DX = unlocked memory block handle
EBX = new size in KB
Return: AX = status
0001h success
0000h failure
BL = status (80h,81h,A0h-A2h,ABh) (see #1494)
BUG: HIMEM v3.03-3.07 crash on an 80286 machine if any of the 8Xh functions
are called
SeeAlso: #1484,#1492
(Table 1494)
Values for XMS error code returned in BL:
00h successful
80h function not implemented
81h Vdisk was detected
82h an A20 error occurred
8Eh a general driver error
8Fh unrecoverable driver error
90h HMA does not exist or is not managed by XMS provider
91h HMA is already in use
92h DX is less than the /HMAMIN= parameter
93h HMA is not allocated
94h A20 line still enabled
A0h all extended memory is allocated
A1h all available extended memory handles are allocated
A2h invalid handle
A3h source handle is invalid
A4h source offset is invalid
A5h destination handle is invalid
A6h destination offset is invalid
A7h length is invalid
A8h move has an invalid overlap
A9h parity error occurred
AAh block is not locked
ABh block is locked
ACh block lock count overflowed
ADh lock failed
B0h only a smaller UMB is available
B1h no UMB's are available
B2h UMB segment number is invalid
Format of EMM structure:
Offset Size Description (Table 1495)
00h DWORD number of bytes to move (must be even)
04h WORD source handle
06h DWORD offset into source block
0Ah WORD destination handle
0Ch DWORD offset into destination block
Notes: if source and destination overlap, only forward moves (source base
less than destination base) are guaranteed to work properly
if either handle is zero, the corresponding offset is interpreted
as a real-mode address referring to memory directly addressable
by the processor
Format of XMS handle info [array]:
Offset Size Description (Table 1496)
00h BYTE handle
01h BYTE lock count
02h DWORD handle size
06h DWORD handle physical address (only valid if lock count nonzero)
SeeAlso: #1466
--------m-2F4310-----------------------------
INT 2F - Cloaking - REAL-MODE API
AX = 4310h
Return: ES:BX -> driver entry point (see #1468,#1497,#1498,#1499,#1500)
SeeAlso: AX=4310h"XMS"
(Table 1497)
Call the Cloaking v1.01 "Client Registration" function with:
AH = 7Eh
BX = subfunction
0000h get client registration count
0001h get client registration structures
ES:DI -> buffer for registration structures
Return: AX = status
0000h failed
0001h successful
---subfunction 00h---
BX = size of client structure in bytes
CX = number of clients installed
---subfunction 01h---
ES:DI buffer filled
SeeAlso: #1498,#1500,INT 2C/AX=0033h
(Table 1498)
Call the Cloaking v1.01 "Verify Cloaking Host" function with:
AH = 7Fh
Return: AX = status
0000h failed
0001h (successful) if installed
BX = version (0101h for v1.01)
CX = flags
bit 0: host is VCPI-based
DS:DX -> ASCIZ Cloaking host signature
"CLOAKING.EXE"0, followed by a far-call entry point to
uninstall host (see #1499) in Helix's CLOAKING.EXE
SeeAlso: #1497,#1500
Index: installation check;Cloaking host|installation check;CLOAKING.EXE
(Table 1499)
Call the CLOAKING.EXE "Uninstall Host" function with:
Return: AX = 4F4Bh ('OK') if successfully uninstalled protected-mode code
(Table 1500)
Call the Cloaking "Start Protected-Mode Client" function with:
AH = 82h
DX = XMS handle of locked block containing protected-mode code
CL = code size (00h 16-bit, else 32-bit)
ESI, EDI = parameters to pass to protected-mode code
Return: AX = status
nonzero success
0000h failed
BL = error code (A2h,B0h) (see #1494)
Notes: this function calls a user initialization function at offset 0 in
the XMS memory block (see #1501)
supported by Helix's RM386 v6.00 and Helix's CLOAKING.EXE
SeeAlso: #1497,#1498
(Table 1501)
Values user initialization function is called with:
EBX = physical address of block's start
ESI = user data from function 82h call
EDI = user data from function 82h call
CS = code selector for XMS block at EBX (16-bit or 32-bit)
DS = data selector for XMS block, starting at EBX
ES = selector for V86 memory access to full real-mode 1088K
GS = selector for full 4G flat address space
SS:ESP -> stack provided by host
Return: via 32-bit FAR return
Note: the initialization function may call any protected-mode Cloaking
service; it should store the values of DS, ES, and GS for future
reference
--------m-2F4310-----------------------------
INT 2F - Helix Netroom RM386 v6.00 - XMS EXTENSIONS
AX = 4310h
Return: ES:BX -> driver entry point (see #1502,#1503,#1504,#1505)
Notes: HIMEM.SYS v2.77 chains to previous handler if AH is not 00h or 10h
HIMEM.SYS requires at least 256 bytes free stack space when calling
the driver entry point
SeeAlso: AX=4300h,AX=4310h"XMS",AX=4310h"Cloaking"
(Table 1502)
Call the Netroom RM386 v6.00 "Reallocate upper memory block" function with:
AH = 80h
DX = segment address of UMB to resize
BX = new size of block in paragraphs
Return: AX = status
0001h success
0000h failure
BL = error code (80h,B0h,B2h) (see #1494)
DX = maximum available size
Note: this function is identical to function 12h
SeeAlso: #1487,#1503
(Table 1503)
Call the Netroom RM386 v6.00 "re-enable HMA allocation" function with:
AH = 81h
Return: AX = 0001h (success)
SeeAlso: #1470,#1502,#1504
(Table 1504)
Call the Netroom RM386 v6.00 "Create new UMB entry" function with:
AH = 83h
BX = segment of high-memory block
DX = first page of start of block
CX = number of consecutive pages in block
DI = start of UMB in block
Return: AX = 0001h (success)
DI = segment of first high-DOS block
Note: the new UMB is not linked into the high-memory chain
SeeAlso: #1485,#1503,#1505
(Table 1505)
Call the Netroom RM386 v6.00 "Get all XMS handles info" function with:
AH = 84h
CX = size of buffer for handle info
ES:DI -> buffer for handle info (see #1496)
Return: AX = 0001h (success)
DX = current number of allocated XMS handles
SeeAlso: #1504,#1490
--------m-2F4320-----------------------------
INT 2F U - HIMEM.SYS - Mach 20 SUPPORT
AX = 4320h
???
Return: ???
--------m-2F4330-----------------------------
INT 2F CU - HIMEM.SYS v2.77+ - GET EXTERNAL A20 HANDLER ADDRESS
AX = 4330h
Return: AL = 80h if external A20 handler provided
ES:BX -> external A20 handler (see #1506)
CL = A20 detection support
00h handler is unable to report A20 state
01h handler supports function 0002h to report A20 state
Note: HIMEM.SYS calls this function to allow an external program to provide
an A20 handler (i.e. to support a machine not supported by HIMEM
itself)
SeeAlso: AX=4308h,AX=4310h
(Table 1506)
Call parameters for external A20 handler are:
AX = function
0000h disable A20
0001h enable A20
0002h get A20 state
Return: AX = status (functions 0000h and 0001h)
0000h failure
0001h successful
AX = A20 state (function 0002h)
0000h disabled
0001h enabled
Note: HIMEM.SYS only calls function 0002h if the returned CL indicated that
the handler supports the call
--------E-2F43E0BX0000-----------------------
INT 2F - DOS Protected Mode Services (DPMS) v1.0 - INSTALLATION CHECK
AX = 43E0h
BX = 0000h
CX = 4450h ('DP')
DX = 4D53h ('MS')
Return: AX = 0000h if installed
CF clear
ES:DI -> server structure (see #1507)
ES:BX -> registration structure (pre-NWDOS 7 beta spec) (see #1509)
Note: the DPMS 1.0 server included with the original release of Novell DOS
7.0 supports both the beta and 1.0 specification, setting ES:BX even
if CX and DX are not as specified on entry (since the beta
specification did not use those registers). However, the DPMS 1.1
server included with the March 1994 update does not support the beta
specification
SeeAlso: AX=43E1h,AX=43E2h,AX=43E3h,INT 2F/AX=1687h
Index: signature strings;DPMS
Format of DPMS 1.0 server structure:
Offset Size Description (Table 1507)
00h 4 BYTEs signature string "DPMS"
04h 2 BYTEs DPMS version (major,minor)
06h 8 BYTEs blank-padded server OEM name
0Eh 2 BYTEs OEM server version (major,minor)
10h WORD DPMS flags (see #1508)
12h BYTE CPU type
(02h = 286, 03h = 386 or higher, higher values allowed)
Bitfields for DPMS flags:
Bit(s) Description (Table 1508)
0 fast processor reset available (286 only)
1 DPMS server is enabled
2 memory is remapped
3-15 reserved (undefined)
Format of beta DPMS registration structure:
Offset Size Description (Table 1509)
00h DWORD real-mode API entry point (see #1511)
04h DWORD 16-bit protected-mode API entry point (see #1511)
08h 8 BYTEs reserved (0)
10h 8 BYTEs blank-padded server OEM name
18h WORD flags
bit 0: fast processor reset available (286 only)
bits 1-15 reserved (undefined)
1Ah 2 BYTEs DPMS version (major,minor)
1Ch BYTE CPU type (02h = 286, 03h = 386 or higher)
----------2F43E1-----------------------------
INT 2F - DOS Protected Mode Services (DPMS) v1.0 - REGISTER CLIENT
AX = 43E1h
CX = required protected-mode stack size in bytes
ES:DI -> DPMS client interface structure (see #1510)
Return: AX = 0000h if supported
CF clear
ES:DI buffer filled with API entry point code from offset 0Ah
Note: the client is allowed to copy the returned API code to any location in
memory, and need not keep the three code fields together
SeeAlso: AX=43E0h,AX=43E2h,AX=43E3h
Format of DPMS client interface structure:
Offset Size Description (Table 1510)
00h WORD 0000h (structure version / flags)
02h 8 BYTEs blank-padded client name
0Ah 7 BYTEs real/virtual-86 mode API code (see #1511)
11h BYTE space for return instruction
set to C3h for near return, CBh for far return
12h 7 BYTEs 16-bit protected-mode API code (see #1511)
19h BYTE space for return instruction
set to C3h for near return, CBh for far return
1Ah 9 BYTEs 32-bit protected-mode API code (see #1511)
23h BYTE space for return instruction
set to C3h for near return, CBh for far return
Note: the DPMS server fills the return opcode bytes with zeros and DPMS
requests will thus crash the system unless the application
explicitly sets them (some early versions set them to C3h by
default, but one should not rely on that)
(Table 1511)
Call DPMS entry point with:
AX = 0000h unregister client from server
---control transfer functions---
AX = 0100h call protected-mode procedure
CX = number of words of stack to copy
ES:(E)DI -> callup/down register structure (see #1513)
Return: CF clear if successful
CF set on error
AX = error code (see #1512)
AX = 0101h call real-mode procedure (RETF return)
CX = number of words of stack to copy
ES:(E)DI -> callup/down register structure (see #1513)
Return: CF clear if successful
CF set on error
AX = error code (see #1512)
AX = 0102h call real-mode procedure (IRET return)
CX = number of words of stack to copy
ES:(E)DI -> callup/down register structure (see #1513)
Return: CF clear if successful
CF set on error
AX = error code (see #1512)
AX = 0103h call real-mode interrupt handler
BL = interrupt number
CX = number of words of stack to copy
ES:(E)DI -> callup/down register structure (see #1513)
Return: CF clear if successful
CF set on error
AX = error code (see #1512)
AX = 0104h register default protected mode procedure
ES:(E)DI -> default register structure (see #1514)
Return: CF clear if successful
CF set on error
AX = error code (see #1512)
AX = 0105h register default real-mode procedure (RETF return)
ES:(E)DI -> default register structure (see #1514)
Return: CF clear if successful
CF set on error
AX = error code (see #1512)
Note: the procedure will be called from 16-bit prot. mode
AX = 0106h register default real-mode procedure (IRET return)
ES:(E)DI -> default register structure (see #1514)
Return: CF clear if successful
CF set on error
AX = error code (see #1512)
Note: the procedure will be called from 16-bit prot. mode
AX = 0107h register default real-mode interrupt handler
BL = interrupt number
ES:(E)DI -> default register structure (see #1514)
Return: CF clear if successful
CF set on error
AX = error code (see #1512)
Note: the handler will be called from 16-bit protected mode
AX = 0108h register default real-mode procedure (RETF return)
ES:(E)DI -> default register structure (see #1514)
Return: CF clear if successful
CF set on error
AX = error code (see #1512)
Note: the procedure will be called from 32-bit prot. mode
AX = 0109h register default real-mode procedure (IRET return)
ES:(E)DI -> default register structure (see #1514)
Return: CF clear if successful
CF set on error
AX = error code (see #1512)
Note: the procedure will be called from 32-bit prot. mode
AX = 010Ah register default real-mode interrupt handler
BL = interrupt number
ES:(E)DI -> default register structure (see #1514)
Return: CF clear if successful
CF set on error
AX = error code (see #1512)
Note: the handler will be called from 32-bit protected mode
---descriptor management---
AX = 0200h allocate descriptors
CX = number of descriptors to allocate
Return: CF clear if successful
AX = selector for first descriptor allocated
CF set on error
AX = error code (see #1512)
AX = 0201h free a descriptor
BX = selector for descriptor
Return: CF clear if successful
CF set on error
AX = error code (see #1512)
AX = 0202h create alias descriptor
BX = selector for descriptor to be aliased
Return: CF clear if successful
AX = alias descriptor
CF set on error
AX = error code (see #1512)
AX = 0203h build alias to real-mode segment
BX = descriptor
CX = real-mode segment
Return: CF clear if successful
CF set on error
AX = error code (see #1512)
AX = 0204h set descriptor base
BX = descriptor
CX:DX = base address
Return: CF clear if successful
CF set on error
AX = error code (see #1512)
AX = 0205h set descriptor limit
BX = descriptor
CX = limit
Return: CF clear if successful
CF set on error
AX = error code (see #1512)
AX = 0206h set descriptor type/attribute
BX = descriptor
CL = type
CH = attribute
Return: CF clear if successful
CF set on error
AX = error code (see #1512)
AX = 0207h get descriptor base
BX = descriptor
Return: CF clear if successful
CX:DX = base address
CF set on error
AX = error code (see #1512)
---linear memory functions---
AX = 0300h get size of largest free block of memory
Return: CF clear if successful
BX:CX = size
CF set on error
AX = error code (see #1512)
AX = 0301h allocate block of extended memory
BX:CX = required size
Return: CF clear if successful
BX:CX = base address
SI:DI = handle
CF set on error
AX = error code (see #1512)
AX = 0302h free block of extended memory
SI:DI = handle
Return: CF clear if successful
CF set on error
AX = error code (see #1512)
AX = 0303h map linear memory
ES:(E)DI -> DDS (see #1515)
Return: CF clear if successful
BX:CX = base address
SI:DI = handle
CF set on error
AX = error code (see #1512)
AX = 0304h unmap linear memory
SI:DI = handle
Return: CF clear if successful
CF set on error
AX = error code (see #1512)
AX = 0305h get page table entries
ESI = linear address
(E)CX = count
ES:(E)DI -> buffer for page table entries
Return: CF clear if successful
ES:(E)DI buffer filled
CF set on error
AX = error code (see #1512)
AX = 0306h set page table entries
EBX = linear memory handle
ESI = linear address
(E)CX = count
ES:(E)DI -> buffer containing page table entries
Return: CF clear if successful
CF set on error
AX = error code (see #1512)
AX = 0307h get largest mappable block size
Return: CF clear if successful
BX:CX = size
CF set on error
AX = error code (see #1512)
---miscellaneous---
AX = 0400h relocate segment to extended memory
ES:SI = base address
CX = limit
BL = type
BH = attribute
DX = selector or 0000h
Return: CF clear if successful
AX = selector
BX:CX = new base address
SI:DI = handle
CF set on error
AX = error code (see #1512)
Note: the beta DPMS specification, which is still supported by the Novell
DOS 7.0 DPMS host, only supported functions 0100h-0103h, 0200h-0207h,
0300h-0304h, and 0400h
(Table 1512)
Values for DPMS error code:
8000h general error
8001h unsupported function
8002h unable to switch to protected mode
8004h no default stack defined
8005h unknown client
8010h resource unavailable
8011h descriptor unavailable
8012h linear memory unavailable
8013h physical memory unavailable
8021h invalid value
8022h invalid selector
8023h invalid handle
8025h invalid linear address
Format of DPMS callup/down register structure:
Offset Size Description (Table 1513)
00h DWORD EDI
04h DWORD ESI
08h DWORD EBP
0Ch 4 BYTEs reserved (0) (ESP, may be used by DPMS server)
10h DWORD EBX
14h DWORD EDX
18h DWORD ECX
20h DWORD EAX
24h DWORD EIP
28h WORD CS
2Ah 2 BYTEs reserved (0)
2Ch DWORD EFLAGS
30h DWORD ESP
34h WORD SS
36h 2 BYTEs reserved (0)
38h WORD ES
3Ah 2 BYTEs reserved (0)
3Ch WORD DS
3Eh 2 BYTEs reserved (0)
40h WORD FS
42h 2 BYTEs reserved (0)
44h WORD GS
46h 2 BYTEs reserved (0)
Format of DPMS default register structure:
Offset Size Description (Table 1514)
00h DWORD EIP
04h WORD CS
06h 2 BYTEs reserved (0)
08h WORD number of words to copy from stack to stack
0Ah BYTE (call) 00h
(ret) nonzero if call could not be made
0Bh BYTE reserved (may be used by some servers)
0Ch DWORD ESP
10h WORD SS
12h 2 BYTEs reserved (0)
14h WORD ES
16h 2 BYTEs reserved (0)
18h WORD DS
1Ah 2 BYTEs reserved (0)
1Ch WORD FS
1Eh 2 BYTEs reserved (0)
20h WORD GS
22h 2 BYTEs reserved (0)
24h 9 BYTEs API entry code (filled in by server)
Format of DPMS lock DDS:
Offset Size Description (Table 1515)
00h DWORD total size in bytes
04h DWORD offset
08h WORD segment or selector
0Ah WORD reserved
0Ch WORD maximum number of physical blocks structure has space for
0Eh WORD number of physical blocks listed
10h DWORD physical address of first block
14h DWORD size in bytes of first block
...
----------2F43E2-----------------------------
INT 2F - DOS Protected Mode Services (DPMS) v1.0 - ENABLE/DISABLE DPMS
AX = 43E2h
BX = new state (0000h disable, 0001h enable)
Return: AX = 0000h if supported
Note: this function should normally be called only by system software
SeeAlso: AX=43E0h,AX=43E1h,AX=43E3h
----------2F43E3BX0000-----------------------
INT 2F - DOS Protected Mode Services (DPMS) v1.0 - DPMS STARTUP BROADCAST
AX = 43E3h
BX = 0000h
CX = 4450h ('DP')
DX = 4D53h ('MS')
SeeAlso: AX=43E0h,AX=43E4h
----------2F43E4BX0000-----------------------
INT 2F - DOS Protected Mode Services (DPMS) v1.0 - DPMS EXIT BROADCAST
AX = 43E4h
BX = 0000h
CX = 4450h ('DP')
DX = 4D53h ('MS')
SeeAlso: AX=43E0h,AX=43E3h
--------E-2F44-------------------------------
INT 2F U - DOS Extender support???
AH = 44h
AL = function (at least 0Bh, 15h, 17h)
???
Return: ???
Note: called by Codeview for Windows
SeeAlso: AH=86h
--------G-2F4500-----------------------------
INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - INSTALLATION CHECK
AX = 4500h
Return: AL = installation status
01h if PROF.COM installed
02h if VPROD.386 installed
SeeAlso: AX=4501h,AX=4502h
--------G-2F4501-----------------------------
INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - SETUP PROFILER
AX = 4501h
BX = CSIPS buffer size in KB (first parameter for ProfSetup)
CX = output limit in KB (second parameter for ProfSetup)
Note: this call is not supported by PROF.COM
SeeAlso: AX=4502h,AX=4503h
--------G-2F4502-----------------------------
INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - SET SAMPLING RATE
AX = 4502h
BL = sampling rate for PROF.COM (0 < BL <= 13)
(01h = 8192/s, 04h = 1024/s, 08h = 32/s, 0Dh = 1/s)
CX = sampling rate for VPROD.386
Note: for PROF.COM, this programs the CMOS clock by setting BL+2 as the
low four bits of CMOS register 0Ah. The interruption rate is
1 SHL (15 - BL) per second.
SeeAlso: AX=4501h,AX=4503h
--------G-2F4503-----------------------------
INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - START PROFILING
AX = 4503h
Notes: Profiling is also turned on by the key combinations
LeftShift + RightShift + Alt and LeftShift + RightShift + Ctrl
for PROF.COM, this call programs the CMOS clock by reading register
0Ch, and setting bit 6 of register 0Bh. It then makes sure that IRQ8
is unmasked
SeeAlso: AX=4504h
--------G-2F4504-----------------------------
INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - STOP PROFILING
AX = 4504h
Notes: profiling is also turned off by the key combination
LeftShift + RightShift
for PROF.COM, this programs the CMOS clock by reading register 0Ch
and clearing bit 6 of register 0Bh. It then masks IRQ8.
SeeAlso: AX=4503h,AX=4505h,AX=4506h,AX=4507h
--------G-2F4505-----------------------------
INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - CLEAR PROFILING DATA
AX = 4505h
SeeAlso: AX=4503h,AX=4504h,AX=4506h
--------G-2F4506-----------------------------
INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - "ProfFlush"
AX = 4506h
SeeAlso: AX=4505h,AX=4507h
--------G-2F4507-----------------------------
INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - "ProfFinish"
AX = 4507h
Note: this call is essentially a "ProfStop" (AX=4504h) followed by
"ProfFlush" (AX=4506h)
SeeAlso: AX=4504h,AX=4505h,AX=4506h
--------G-2F4508-----------------------------
INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - ALTERNATE SEGDEBUG IFACE
AX = 4508h
BX = ordinal (or 0000h)
CX = segment
DX = instance (or 0000h)
SI = type (or 0000h)
ES:DI -> ASCIZ module name
Notes: this call is an alternate entry to the profiler's SEGDEBUG
interface, but only to function 0, for notifying the profiler of
each new segment loaded. The SHOWHITS utility then examines the
profiler's output files (CSIPS.DAT and SEGENTRY.DAT) in conjunction
with symbol files to provide information in a useful form.
this call does not have a corresponding Windows function
SeeAlso: AX=4500h
--------D-2F4601-----------------------------
INT 2F CU - MS Windows WINOLDAP - SWITCHING ???
AX = 4601h
Return: ???
Note: the DOS 5+ kernel intercepts this function and copies the MCB
following the caller's PSP memory block into the DOS data segment;
in conjunction with AX=4602h, this intercept is used by DOS to
avoid corruption of the Windows real-mode heap's end sentinel
SeeAlso: AX=1700h,AX=4602h
--------D-2F4602-----------------------------
INT 2F CU - MS Windows WINOLDAP - SWITCHING ???
AX = 4602h
Return: ???
Note: the DOS 5+ kernel intercepts this function and copies the
previously-saved MCB from the DOS data segment into the MCB following
the caller's PSP memory block; in conjunction with AX=4601h, this
intercept is used by DOS to avoid corruption of the Windows real-mode
heap's end sentinel
SeeAlso: AX=1700h,AX=4601h
--------E-2F46-------------------------------
INT 2F U - Windows/286 DOS Extender
AH = 46h
AL = subfunction (03h,04h)
Return: ???
Note: these two subfunctions are called by MS Windows 3.0
--------v-2F4653CX0002-----------------------
INT 2F - F-PROT v1.x only - F-LOCK.EXE - API
AX = 4653h
CX = 0002h
BX = subfunction
0000h installation check
Return: AX = FFFFh
0001h uninstall
Return: AX,BX,ES destroyed
0002h disable (v1.08 and below only)
0003h enable (v1.08 and below only)
Program: F-LOCK is part of the shareware F-PROT virus/trojan protection
package by Fridrik Skulason
SeeAlso: AX=4653h/CX=0003h,AX=CA00h,INT 21/AX=4BEEh
Index: installation check;F-LOCK|uninstall;F-LOCK
--------v-2F4653CX0003-----------------------
INT 2F - F-PROT v1.x only - F-XCHK.EXE - API
AX = 4653h
CX = 0003h
BX = subfunction
0000h installation check
Return: AX = FFFFh
0001h uninstall
Return: AX,BX,ES destroyed
Program: F-XCHK is part of the shareware F-PROT virus/trojan protection
package by Fridrik Skulason
SeeAlso: AX=4653h/CX=0002h,AX=4653h/CX=0004h,AX=CA00h
Index: installation check;F-XCHK|uninstall;F-XCHK
--------v-2F4653CX0004-----------------------
INT 2F - F-PROT v1.x only - F-POPUP.EXE - API
AX = 4653h
CX = 0004h
BX = subfunction
0000h installation check
Return: AX = FFFFh
0001h uninstall
Return: AX,BX,ES destroyed
0002h disable (v1.08 and below only)
display message (v1.14+)
other registers: ???
0003h enable (v1.08 and below only)
display message (v1.14+)
other registers: ???
Return: AX = key pressed by user
Program: F-POPUP is part of the shareware F-PROT virus/trojan protection
package by Fridrik Skulason
SeeAlso: AX=4653h/CX=0003h,AX=4653h/CX=0005h,AX=CA00h
Index: installation check;F-POPUP|uninstall;F-POPUP
--------v-2F4653CX0005-----------------------
INT 2F - F-PROT v1.x only - F-DLOCK.EXE - API
AX = 4653h
CX = 0005h
BX = subfunction
0000h installation check
Return: AX = FFFFh
0001h uninstall
Return: AX,BX,ES destroyed
Program: F-DLOCK is part of the shareware F-PROT virus/trojan protection
package by Fridrik Skulason
SeeAlso: AX=4653h/CX=0004h,AX=CA00h
Index: installation check;F-DLOCK|uninstall;F-DLOCK
--------W-2F4680-----------------------------
INT 2F U - MS Windows v3.0 - INSTALLATION CHECK
AX = 4680h
Return: AX = result
0000h MS Windows 3.0 running in real (/R) or standard (/S) mode,
or DOS 5 DOSSHELL active
nonzero no Windows, Windows prior to 3.0, or Windows3 in enhanced
mode
Note: Windows 3.1 finally provides an installation check which works in all
modes (see AX=160Ah)
SeeAlso: AX=1600h,AX=160Ah
----------2F47-------------------------------
INT 2F U - ???
AH = 47h
???
Return: ???
Note: reportedly called by Microsoft BASIC Compiler v7.0
--------K-2F4800-----------------------------
INT 2F - DOS 5+ DOSKEY - INSTALLATION CHECK
AX = 4800h
Return: AL = nonzero if installed (DOS 5.0 and 6.0 return AX=AA02h)
ES = segment of DOSKEY resident portion
Note: DOSKEY chains if AL is not 00h or 10h on entry
SeeAlso: AX=4800h"PCED",AX=4810h
--------K-2F4800-----------------------------
INT 2F - PCED v2.1 - INSTALLATION CHECK
AX = 4800h
Return: AX = AACDh if installed
ES = segment of PCED kernel (PCED has multiple code segments)
Program: PCED v2.1 is a command line editor/history/macro facility by
Cove Software. It is the commercial version of the freeware CED.
Notes: DOSKEY also responds to this call if installed, returning AX=AA02h.
unlike DOSKEY, PCED does *not* chain if AL contains an
unsupported function code. It IRETs with all registers intact.
--------K-2F4810-----------------------------
INT 2F - DOS 5+ DOSKEY, PCED v2.1 - READ INPUT LINE FROM CONSOLE
AX = 4810h
DS:DX -> line buffer (see #0573 at INT 21/AH=0Ah)
Return: AX = 0000h if successful
Notes: the first byte (length) of the buffer MUST be 80h, or DOSKEY chains to
the previous handler; PCED allows sizes other than 80h
if the user's input is a macro name, no text is placed in the buffer
even though AX=0000h on return; the program must immediately issue
this call again to retrieve the expansion of the macro. Similarly,
if the user enters a special parameter such as $*, this call must
be repeated to retrieve the expansion; on the second call, DOSKEY
overwrites the macro name on the screen with its expansion.
unlike DOSKEY, PCED expands all macros on the first call, so it is
not necessary to make two calls; since the buffer is not empty on
return, DOSKEY-aware programs will not make the second call
DOSKEY chains if AL is not 00h or 10h on entry
SeeAlso: AX=4800h,INT 21/AH=0Ah
--------K-2F48C0-----------------------------
INT 2F - PCED v2.1 - PCED API
AX = 48C0h
DX = API function code
other registers as required by the specified function
Return: CF clear if successful
CF set on error
AX = PCED error code
other registers as appropriate for API function
Program: PCED v2.1 is a command line editor/history/macro facility by
Cove Software. It is the commercial version of the freeware CED.
Note: the full API information is available from Cove Software
SeeAlso: AX=4800h"PCED",AX=48C1h,AX=48C2h,AX=48C3h
----------2F48C1BL00-------------------------
INT 2F - PCED/VSTACK - INSTALLATION CHECK
AX = 48C1h
BL = 00h
Return: AX = 0000h if installed
BX = VSTACK resident segment
Program: VSTACK is a resident backscroll utility included as part of the PCED
package by Cove Software
Note: chains if BL <> 00h on entry
SeeAlso: AX=48C0h,AX=48C2h
----------2F48C2BL00-------------------------
INT 2F - PCED/ATTRIB - INSTALLATION CHECK
AX = 48C2h
BL = 00h
Return: AX = 0000h if installed
BX = ATTRIB resident segment
Program: ATTRIB is a resident file attribute changer included as part of the
PCED package by Cove Software
Note: chains if BL <> 00h on entry
SeeAlso: AX=48C0h,AX=48C1h,AX=48C3h
--------K-2F48C3BL00-------------------------
INT 2F - PCED/KEYDEF - INSTALLATION CHECK
AX = 48C3h
BL = 00h
Return: AX = 0000h if installed
BX = KEYDEF resident segment
Program: KEYDEF is a resident keyboard redefinition utility included as part
of the PCED package by Cove Software
Note: chains if BL <> 00h on entry
SeeAlso: AX=48C0h,AX=48C2h,AX=48C4h
----------2F48C4BL00-------------------------
INT 2F - PCED/FLIST - INSTALLATION CHECK
AX = 48C4h
BL = 00h
Return: AX = 0000h if installed
BX = FLIST resident segment
Program: FLIST is a resident filelist processor included as part of the PCED
package by Cove Software
Note: chains if BL <> 00h on entry
SeeAlso: AX=48C0h,AX=48C3h,AX=48C5h
----------2F48C5BL00-------------------------
INT 2F - PCED/ASSOC - INSTALLATION CHECK
AX = 48C5h
BL = 00h
Return: AX = 0000h if installed
BX = ASSOC resident segment
Program: ASSOC is a resident utility included as part of the PCED package which
associated files with executable programs based on their extensions
Note: chains if BL > 02h on entry
SeeAlso: AX=48C0h,AX=48C4h,AX=48C5h/BL=01h,AX=48C5h/BL=02h
----------2F48C5BL01-------------------------
INT 2F - PCED/ASSOC - VERSION CHECK
AX = 48C5h
BL = 01h
Return: AX = 0000h if installed
BX = binary ASSOC version (BL = major, BH = minor)
Note: chains if BL > 02h on entry
SeeAlso: AX=48C0h,AX=48C5h/BL=00h,AX=48C5h/BL=02h
----------2F48C5BL02-------------------------
INT 2F - PCED/ASSOC - ASSOCIATION TEST
AX = 48C5h
BL = 02h
DS:SI -> ASCIZ filename
Return: AX = status
0000h if filename is unknown
0001h if there is an association defined for the file
BX destroyed
Program: ASSOC is a resident utility included as part of the PCED package which
associated files with executable programs based on their extensions
Note: chains if BL > 02h on entry
SeeAlso: AX=48C0h,AX=48C5h/BL=00h,AX=48C5h/BL=01h
----------2F49-------------------------------
INT 2F U - ???
AH = 49h
???
Return: ???
Note: reportedly called by DOS 5.0 installation
--------D-2F4A00CX0000-----------------------
INT 2F CU - DOS 5+ - FLOPPY-DISK LOGICAL DRIVE CHANGE NOTIFICATION
AX = 4A00h
CX = 0000h
DH = new drive number
DL = current drive number
Return: CX = FFFFh to skip "Insert diskette for drive X:" message
Note: called by MS-DOS 5.0+ IO.SYS just before displaying the message
"Insert diskette for drive X:" on single-floppy systems
--------D-2F4A01-----------------------------
INT 2F - DOS 5+ - QUERY FREE HMA SPACE
AX = 4A01h
Return: BX = number of bytes available in HMA (0000h if DOS not using HMA)
ES:DI -> start of available HMA area (FFFFh:FFFFh if not using HMA)
Note: called by Windows 3.1 DOSX.EXE
SeeAlso: AX=4310h,AX=4A02h
--------D-2F4A02-----------------------------
INT 2F - DOS 5+ - ALLOCATE HMA SPACE
AX = 4A02h
BX = number of bytes
Return: ES:DI -> start of allocated HMA block or FFFFh:FFFFh
BX = number of bytes actually allocated (rounded up to next paragraph
for DOS 5.0 and 6.0)
Notes: this call is not valid unless DOS is loaded in the HMA (DOS=HIGH)
called by Windows 3.1 DOSX.EXE
SeeAlso: AX=4A01h
--------T-2F4A05-----------------------------
INT 2F U - DOS 5+ DOSSHELL - TASK SWITCHING API???
AX = 4A05h
SI = function
0000h reset???
0001h ???
ES:BP -> 80-byte buffer containing ???
0002h ???
0003h ???
0004h ???
BL = ???
0005h ???
0006h get ???
Return: ES:SI -> ???
0007h get ???
Return: AX = ???
0008h get ???
Return: DX:AX -> ??? (internal control data of some kind)
0009h get ???
Return: ES:SI -> ??? (apparently identical to function 0006h)
000Ah ???
BL = length of buffer
ES:BP -> buffer containing ???
000Bh get ???
Return: AX = ???
000Ch ???
BL = ???
Return: if BL nonzero on entry
DX:AX -> ???
if BL = 00h on entry
ES:SI -> ???
Notes: DOSSHELL chains to the previous handler if SI is not one of the values
listed above
the DOSSWAP.EXE module calls functions 03h,04h,05h,07h,08h,09h,0Ch
the Windows 3.1 DSWAP.EXE and WSWAP.EXE task switchers use these calls
SeeAlso: AX=4B01h
--------D-2F4A06-----------------------------
INT 2F CU - DOS 5+ - DOS SUPERVISOR "REBOOT PANEL" - ADJUST MEMORY SIZE
AX = 4A06h
DX = segment following last byte of conventional memory
Return: DX = segment following last byte of memory available for use by DOS
Desc: used to override the default memory size when booting diskless
workstations
Notes: called by MS-DOS 5+ IO.SYS startup code if the signature "RPL" is
present three bytes beyond the INT 2F handler; this call overrides
the value returned by INT 12
hooked by RPL code at the top of memory to protect itself from being
overwritten; DOS builds a memory block with owner = 0008h and name
"RPL" which must be freed by the RPL code when it is done
SeeAlso: INT 12,INT 18
--------N-2F4A07-----------------------------
INT 2F U - RESERVED FOR PROTMAN SUPPORT
AX = 4A07h
???
Return: ???
--------c-2F4A10BX0000-----------------------
INT 2F - SMARTDRV v4.00+ - INSTALLATION CHECK AND HIT RATIOS
AX = 4A10h
BX = 0000h
CX = EBABh (v4.1+; see Note)
Return: AX = BABEh if installed
DX:BX = cache hits
DI:SI = cache misses
CX = number of dirty cache elements
BP = version in BCD (4.10 = 0410h)
Notes: most of the SMARTDRV API, including this call, is supported by
PC-Cache v8.0 and recent versions of the Norton Caches
if DBLSPACE.BIN is installed but SMARTDRV has not yet been installed,
then calls of this function with CX<>EBABh on entry cause
DBLSPACE.BIN to display the error message
"Cannot run SMARTDrive 4.0 with DoubleSpace" and abort the caller
with INT 21/AX=4C00h
SMARTDRV v3.x had a completely different API using IOCTL calls, which
was also supported by the Norton Caches
SeeAlso: AX=4A10h/BX=0001h,AX=4A10h/BX=0004h,AX=4A10h/BX=0005h
SeeAlso: AX=4A10h/BX=0007h,AX=4A10h/BX=1234h,AX=4A11h/BX=0000h
SeeAlso: INT 21/AX=4402h"SMARTDRV",INT 21/AX=4403h"SMARTDRV"
----------2F4A10BX0000-----------------------
INT 2F U - Novell NWCACHE - ???
AX = 4A10h
BX = 0000h
CX = 0EDCh
Return: ???
SeeAlso: AX=4A10h/BX=0001h"NWCACHE"
--------c-2F4A10BX0001-----------------------
INT 2F - SMARTDRV v4.00+ - FLUSH BUFFERS (COMMIT CACHE)
AX = 4A10h
BX = 0001h
Note: this function is also supported by PC-Cache v8.0.
SeeAlso: AX=4A10h/BX=0000h,AX=4A10h/BX=0002h
----------2F4A10BX0001-----------------------
INT 2F U - Novell NWCACHE - ???
AX = 4A10h
BX = 0001h
CX = 0EDCh
Return: ???
SeeAlso: AX=4A10h/BX=0000h"NWCACHE"
--------c-2F4A10BX0002-----------------------
INT 2F - SMARTDRV v4.00+ - RESET CACHE
AX = 4A10h
BX = 0002h
Note: this function is also supported by PC-Cache v8.0.
SeeAlso: AX=4A10h/BX=0000h,AX=4A10h/BX=0001h
--------c-2F4A10BX0003-----------------------
INT 2F - SMARTDRV v4.00+ - STATUS
AX = 4A10h
BX = 0003h
BP = drive number (0=A, 1=B, etc.)
DL = subfunction
00h only get information
01h turn on read cache
02h turn off read cache
03h turn on write cache
04h turn off write cache
Return: AX = BABEh if OK
DL = status (see #1516)
DL = FFh if drive does not exist
Notes: If the read cache is off, reads will not be cached, but writes will
continue to be cached if the write-cache is enabled.
this function is also supported by PC-Cache v8.0.
SeeAlso: AX=4A10h/BX=0000h
Bitfields for SMARTDRV status:
Bit(s) Description (Table 1516)
7 not cached
6 write-through (not write-cached)
0-5 real drive number (0=A, 1=B...)
--------c-2F4A10BX0004-----------------------
INT 2F - SMARTDRV v4.00+ - GET CACHE SIZE
AX = 4A10h
BX = 0004h
Return: AX = size in elements of full-sized cache
BX = current size in elements
CX = size of one element in bytes
DX = number of elements under Windows
Note: this function is also supported by PC-Cache v8.0.
SeeAlso: AX=4A10h/BX=0000h,AX=4A10h/BX=0003h,AX=4A10h/BX=0005h
--------c-2F4A10BX0005-----------------------
INT 2F - SMARTDRV v4.00+ - GET DOUBLE-BUFFER STATUS
AX = 4A10h
BX = 0005h
BP = drive number (0=A, 1=B...)
Return: AX = BABEh if double-buffered
ES:DI -> 16-byte array of status bytes for fixed disks (see #1517)
SeeAlso: AX=4A10h/BX=0000h,AX=4A10h/BX=0003h,AX=4A10h/BX=0006h
(Table 1517)
Values for SMARTDRV status byte:
00h state unknown
FFh drive double-buffered
else not double-buffered
--------c-2F4A10BX0006-----------------------
INT 2F CU - SMARTDRV v4.00+ - CHECK IF DRIVE CACHEABLE
AX = 4A10h
BX = 0006h
CL = drive number (01h = A:)
Return: AX = 0006h if drive should not be cached by SMARTDRV
Note: called by SMARTDRV at startup to determine whether it should cache
a particular drive
SeeAlso: AX=4A10h/BX=0000h
--------c-2F4A10BX0007-----------------------
INT 2F - SMARTDRV v4.00+ - GET DEVICE DRIVER FOR DRIVE
AX = 4A10h
BX = 0007h
BP = drive number (00h=A:)
Return: DL = unit number within device driver
ES:DI -> device driver header for drive
Note: this function is also supported by PC-Cache v8.0.
this call is reported to always return the driver header of the
standard block driver (A:-C:+) for SmartDrive v5.00 from MS-DOS 6.2
SeeAlso: AX=4A10h/BX=0000h,AX=4A11h/BX=0003h,AX=4A11h/BX=0004h
--------c-2F4A10BX0008-----------------------
INT 2F - SMARTDRV v4.20+ - GET/SET FLUSH BEFORE PROMPT, CD-ROM SUPPORT
AX = 4A10h
BX = 0008h
DL = subfunction
00h set
DH = new states
bit 0: flush before prompt
bits 1-7 reserved (0)
01h get
Return: DH = status flags
bit 0: (v4.2+) flush before prompt
bit 1: (v5.0+) CD-ROM caching support installed
Note: v4.2 was an interim release to fix problems in the SMARTDRV included
with MS-DOS 6.00; v5.00 is included with MS-DOS 6.2
--------c-2F4A10BX000A-----------------------
INT 2F - SMARTDRV v4.00+ - GET ELEMENT STATUS TABLE
AX = 4A10h
BX = 000Ah
Return: ES:BX -> information pointer table (see #1518)
Note: this function is also supported by PC-Cache v8.0.
SeeAlso: AX=4A10h/BX=0000h
Format of SMARTDRV information pointer table:
Offset Size Description (Table 1518)
00h WORD offset of ??? byte/word array (byte if elements < 2000h bytes)
02h WORD offset of dirty flag byte/word array (byte if elts < 2000h)
each byte/word is a bit string of the dirty sectors in element
04h WORD offset of word array containing low halves of unique
identifiers for the corresponding element's contents
06h WORD offset of word array containing high halves of unique
identifiers for the corresponding element's contents
08h WORD offset of WORD containing current number of elements in cache
--------c-2F4A10BX1234-----------------------
INT 2F - SMARTDRV v4.00+ - SIGNAL SERIOUS ERROR
AX = 4A10h
BX = 1234h
Desc: this function pops up a message box saying that a serious error
occurred and to hit R to retry, then waits for the keypress
Note: this function is also supported by PC-Cache v8.0.
SeeAlso: AX=4A10h/BX=0000h
--------k-2F4A11BX0000-----------------------
INT 2F - DBLSPACE.BIN - "GetVersion" - INSTALLATION CHECK
AX = 4A11h
BX = 0000h
Return: AX = 0000h (successful)
BX = 444Dh ("DM")
CL = first drive letter used by DBLSPACE (41h ['A'] = A:)
CH = number of drive letters used by DBLSPACE
DX = internal DBLSPACE.BIN version number (bits 14-0)
bit 15 set if DBLSPACE.BIN has not yet been relocated to final
position in memory (i.e. DBLSPACE.SYS /MOVE)
Program: DBLSPACE.BIN is the resident driver for DoubleSpace, the
disk-compression software bundled with MS-DOS 6.0 and 6.20
Notes: this function is also supported by the version of SuperStor bundled
with IBM DOS 6.x and "preloading" versions of Stacker
the complete DBLSPACE.BIN API is still supported by MS-DOS 6.22's
DRVSPACE.BIN
SeeAlso: AX=4A11h/BX=0001h,AX=4A11h/BX=0002h,AX=4A11h/BX=0003h
SeeAlso: AX=4A11h/BX=0005h,AX=4A11h/BX=0007h,AX=4A11h/BX=FFFFh
SeeAlso: INT 21/AX=4404h"DBLSPACE"
--------k-2F4A11BX0001-----------------------
INT 2F - DBLSPACE.BIN - "GetDriveMapping" - GET DRIVE MAPPING
AX = 4A11h
BX = 0001h
DL = drive number (0=A:)
Return: AX = status (see also #1519)
0000h successful
if DL was compressed drive,
BL = host drive (bit 7 set if drive is compressed)
else if DL was host drive,
BL = compressed drive
else
BL = specified drive (if available for DoubleSpace)
BH = DoubleSpace sequence number
other error code (0101h) (see #1519)
apparently never returned for the MS-DOS 6.2 DoubleSpace
Note: the compressed volume file for the specified compressed drive is
host:\DBLSPACE.sequence
SeeAlso: AX=4A11h/BX=0000h
(Table 1519)
Values for DBLSPACE function status:
0000h successful
0100h bad function
0101h invalid drive
0102h not a compressed drive
0103h drive already swapped
0104h drive not swapped
--------k-2F4A11BX0002-----------------------
INT 2F - DBLSPACE.BIN - "Swap Drive" - SWAP DRIVE LETTERS OF CVF AND HOST DRIVE
AX = 4A11h
BX = 0002h
DL = drive number (0=A:) of compressed drive to swap with its host
Return: AX = status (0000h,0101h,0102h,0103h) (see #1519)
Note: this function is intended for use by DBLSPACE.EXE only
SeeAlso: AX=4A11h/BX=0000h
--------k-2F4A11BX0003-----------------------
INT 2F - DBLSPACE.BIN - "DSGetEntryPoints" - GET DEVICE DRIVER ENTRY POINTS
AX = 4A11h
BX = 0003h
CL = drive number (0=A:) of compressed drive
Return: CL = FFh on error (not compressed drive)
CL <> FFh driver unit number of host drive
ES:SI -> device driver's strategy routine
ES:DI -> device driver's interrupt routine
BX destroyed
Note: in conjunction with subfunction 0004h, this call allows disk caches
like SMARTDRV to apply a device driver wrapper to DoubleSpaced
drives just like SMARTDRV applies to regular block devices
SeeAlso: AX=4A10h/BX=0007h,AX=4A11h/BX=0000h,AX=4A11h/BX=0004h
--------k-2F4A11BX0004-----------------------
INT 2F - DBLSPACE.BIN - "DSSetEntryPoints" - SET DEVICE DRIVER ENTRY POINTS
AX = 4A11h
BX = 0004h
CL = drive number (0=A:) of compressed drive
DL = unit number for new driver entry points
DH = 00h
ES:SI -> device driver strategy routine to call for drive
ES:DI -> device driver interrupt routine to call for drive
Return: CL = FFh on error (not a compressed drive)
BX destroyed
Program: DBLSPACE.BIN is the resident driver for DoubleSpace, the
disk-compression software bundled with MS-DOS 6.0
Note: in conjunction with subfunction 0003h, this call allows disk caches
like SMARTDRV to apply a device driver wrapper to DoubleSpaced
drives just like SMARTDRV applies to regular block devices
SeeAlso: AX=4A10h/BX=0007h,AX=4A11h/BX=0000h,AX=4A11h/BX=0003h
--------k-2F4A11BX0005-----------------------
INT 2F - DBLSPACE.BIN - "ActivateDrive" - MOUNT COMPRESSED DRIVE
AX = 4A11h
BX = 0005h
DL = drive number (0=A:) to assign to new drive
ES:SI -> activation record (see #1520)
Return: status returned in activation record (see #1521)
SeeAlso: AX=4A11h/BX=0000h,AX=4A11h/BX=0006h
Format of DBLSPACE activation record:
Offset Size Description (Table 1520)
00h 2 BYTEs signature "MD" (4Dh 44h)
02h BYTE 4Dh ('M') mount command
03h BYTE error code (set to FFh before calling) (see #1521)
04h BYTE host drive number (0=A:)
05h ??? DISK_UNIT structure (not documented)
(Table 1521)
Values for DBLSPACE Mount error code:
00h successful
01h drive letter not available for DoubleSpace
02h drive letter already in use
03h no more disk units (increase MaxRemovableDrives in .INI)
09h CVF too fragmented
--------k-2F4A11BX0006-----------------------
INT 2F - DBLSPACE.BIN - "DeactivateDrive" - UNMOUNT COMPRESSED DRIVE
AX = 4A11h
BX = 0006h
DL = drive number (0=A:) to unmount
Return: AX = status (0000h,0102h) (see #1519)
SeeAlso: AX=4A11h/BX=0000h,AX=4A11h/BX=0005h
--------k-2F4A11BX0007-----------------------
INT 2F - DBLSPACE.BIN - "GetDriveSpace" - GET SPACE AVAIL ON COMPRESSED DRIVE
AX = 4A11h
BX = 0007h
DL = compressed drive number (0=A:)
Return: AX = status (0000h,0102h) (see also #1519)
0000h successful
DS:SI -> free space record (see #1522)
Program: DBLSPACE.BIN is the resident driver for DoubleSpace, the
disk-compression software bundled with MS-DOS 6.0
SeeAlso: AX=4A11h/BX=0000h,AX=4A11h/BX=0008h
Format of DBLSPACE free space record:
Offset Size Description (Table 1522)
00h DWORD total number of sectors in drive's sector heap
04h DWORD number of free sectors in drive's sector heap
--------k-2F4A11BX0008-----------------------
INT 2F - DBLSPACE.BIN - "GetFileFragmentSpace" - GET SIZE OF FRAGMENT HEAP
AX = 4A11h
BX = 0008h
DL = compressed drive number (0=A:)
Return: AX = status (0000h,0102h) (see also #1519)
0000h successful
BX = maximum entries in File Fragment heap
CX = available entries in File Fragment heap
SeeAlso: AX=4A11h/BX=0000h,AX=4A11h/BX=0007h,AX=4A11h/BX=0009h
--------k-2F4A11BX0009-----------------------
INT 2F - DBLSPACE.BIN - "GetExtraInfo" - DETERMINE NUMBER OF DISK_UNIT STRUCTS
AX = 4A11h
BX = 0009h
DL = compressed drive number (0=A:)
Return: AX = status (see also #1519)
0000h successful
CL = number of DISK_UNIT structures allocated
(see AX=4A11h/BX=0005h)
CH = DoubleGuard enabled-checks bitflags in bits 6-0 (DOS 6.2)
Note: the DoubleGuard checks are enabled or disabled as a block by the
DoubleGuard= line in DBLSPACE.INI; they may be individually set with
the CheckSum= line.
SeeAlso: AX=4A11h/BX=0000h,AX=4A11h/BX=0008h
--------k-2F4A11BX000A-----------------------
INT 2F - DBLSPACE.BIN v6.2 - SET AUTOMOUNT DRIVES
AX = 4A11h
BX = 000Ah
CX:DX = bitmask of drives on which to enable AutoMount
(DX bit 0 = A:, CX bit 0 = P:, etc.)
Return: AX = 0000h if supported
CX:DX = old mask or 0000h:0000h on error
BX destroyed
SeeAlso: AX=4A11h/BX=000Bh
--------k-2F4A11BX000B-----------------------
INT 2F - DBLSPACE.BIN v6.2 - GET AUTOMOUNT DRIVES
AX = 4A11h
BX = 000Bh
Return: AX = 0000h if supported
CX:DX = mask of drives with AutoMount enabled
0000h:0000h on error
BX destroyed
SeeAlso: AX=4A11h/BX=000Ah
--------k-2F4A11BXFFFE-----------------------
INT 2F U - DBLSPACE.BIN - RELOCATE
AX = 4A11h
BX = FFFEh
ES = segment to which to relocate DBLSPACE.BIN
Return: ???
Notes: called by DBLSPACE.SYS to relocate DBLSPACE.BIN to its final position
in memory
this function also unhooks and discards the code providing this
function and AX=4A11h/BX=FFFFh
this function is also supported by the version of SuperStor bundled
with IBM DOS 6.x and "preloading" versions of Stacker
SeeAlso: AX=4A11h/BX=FFFFh
--------k-2F4A11BXFFFF-----------------------
INT 2F U - DBLSPACE.BIN - GET RELOCATION SIZE
AX = 4A11h
BX = FFFFh
Return: AX = number of paragraphs needed by DBLSPACE.BIN
Note: used by DBLSPACE.SYS to relocate the DBLSPACE driver to its final
position in memory
this function is also supported by the version of SuperStor bundled
with IBM DOS 6.x and "preloading" versions of Stacker
SeeAlso: AX=4A11h/BX=0000h,AX=4A11h/BX=FFFEh
--------k-2F4A12CX4D52-----------------------
INT 2F - Microsoft Realtime Compression Interface (MRCI) - RAM-BASED SERVER
AX = 4A12h
CX = 4D52h ("MR")
DX = 4349h ("CI")
Return: CX = 4943h ("IC") if installed
DX = 524Dh ("RM") if installed
ES:DI -> MRCINFO structure (see #0544 at INT 1A/AX=B001h)
Note: this call is functionally identical to INT 1A/AX=B001h, but should be
called first, as the latter call is used for the first, ROM-based
MRCI server, while this call is used for RAM-based servers which
may be partially or entirely replacing a prior server
SeeAlso: AX=4A12h/CX=5354h,INT 1A/AX=B001h
--------k-2F4A12CX5354-----------------------
INT 2F - Stacker 4 LZS Compression Interface (LZSAPI)
AX = 4A12h
CX = 5354h ("ST")
DX = 4143h ("AC")
Return: AX = 4F4Bh ("OK") if installed
CX = 7374h ("st") if installed
DX = 6163h ("ac") if installed
ES:DI -> entry point in LZSAPI server (usually, driver
STACKER.COM) containing far address of an actual
LZSINFO structure (see #1523)
SeeAlso: AX=4A12h/CX=4D52h,INT 25/AX=CDCDh
Format of LZSINFO structure:
Offset Size Description (Table 1523)
00h 6 BYTEs signature "LZSAPI"
06h WORD server version (200 (0C8h) for Stacker 4 and Stacker Anywhere)
08h 4 BYTEs vendor signature
"STAC" = Stac Electronics, Inc.
0Ch 6 BYTEs ???
12h WORD bit flags: server status/capabilities (see #1524)
14h DWORD -> Stacker 3.X-compatible compression procedure
18h DWORD -> Stacker 3.X-compatible decompression procedure
1Ch 4 BYTEs reserved (always set to 0)
20h DWORD -> incremental Stacker 3.x-compatible compression procedure
(see #1525)
24h 4 BYTEs ???
28h DWORD -> incremental Stacker 3.x-compatible decompression procedure
(see #1526)
2Ch 4 BYTES ???
30h DWORD -> new (Stacker 4) compression procedure
34h 4 BYTEs ???
38h DWORD -> new (Stacker 4) decompression procedure
Notes: Stacker 4 usally keeps two different data-compression algorithms in
memory (preferably in XMA):
1) new (Stacker 4) data compression algorithm (4K LZ77 with hashing
and static Huffman encoding), and
2) old (Stacker 3.x-compatible) one (2K LZ77 with hashing), which
is used to work with STACVOL files created under older
versions of Stacker.
Bitfields for LZSAPI capabilities:
Bit(s) Description (Table 1524)
0 ???
1 busy/error flag
2-10 ???
11 maximum compressor/decompressor presented
(Table 1525)
Call Stacker 3.x-style non-incremental functions with:
STACK: DWORD return address for compress/decompress procedure
WORD compression algorithm parameters (see #1527)
WORD size of destination buffer (in bytes)
DWORD address of destination buffer
WORD size of source buffer (in bytes)
DWORD address of source buffer
Return: (compression/decompression procedure)
AX = size of resulting data in destination buffer
0000h if error (either destination buffer too small or error in
compressed data)
(Table 1526)
Call Stacker 4-style incremental procedures with:
STACK: DWORD return address for compr./decompr. procedure
DWORD address of LZSSWAP structure (see #1528)
if 0000:0000, procedure uses non-incremental technique
WORD compression algorithm parameters (see #1527)
WORD size of destination buffer (in bytes)
DWORD address of destination buffer
WORD size of source buffer (in bytes)
DWORD address of source buffer
(Table 1527)
Values for Compression algorithm parameters:
Value Compression level (/P=xx parameter)
07F9h 1
0621h 2
0625h 3
0665h 4
0669h 5
06E9h 6
06EDh 7
07D1h 8
07D9h 9
Format of LZSSWAP structure:
Offset Size Description (Table 1528)
00h 2 BYTEs signature "CS"
02h 6 BYTEs reserved
08h DWORD address of destination buffer swapping procedure
0Ch DWORD address of stack swapping procedure
--------k-2F4A13-----------------------------
INT 2F U - DBLSPACE.BIN - GET ??? ENTRY POINTS
AX = 4A13h
Return: AX = 134Ah if supported
ES:BX -> entry point record (see #1529)
SeeAlso: AX=4A11h/BX=0000h
Format of DBLSPACE entry point record:
Offset Size Description (Table 1529)
00h DWORD pointer to FAR function for ???
04h 5 BYTEs FAR JUMP instruction to ???
--------N-2F4B-------------------------------
INT 2F - LAN Manager 2.0 DOS Enh NETWKSTA.EXE - NETWORK WORKSTATION REDIRECTOR
AH = 4Bh
???
Return: ???
Note: LAN Manager enhanced mode adds features beyond the standard redirector
file/printer services
SeeAlso: AX=118Ah,AX=4100h,AH=42h
--------T-2F4B01-----------------------------
INT 2F C - DOS 5+ TASK SWITCHER - BUILD CALLOUT CHAIN
AX = 4B01h
CX:DX -> task switcher entry point (see #1532)
ES:BX = 0000h:0000h
Return: ES:BX -> callback info structure (see #1530) or 0000h:0000h
Notes: called by the task switcher
this function is hooked by clients which require notification of task
switcher activities; the call must first be passed on to the prior
handler with registers unchanged using a simulated interrupt. On
return, the client must build a callback info structure and store
the returned ES:BX in the "next" field, then return the address of
its own callback info structure.
a client program must add itself to the notification chain if it
provides services to other programs; before terminating, it must
remove itself from the chain by calling the task switcher's entry
point with AX=0005h (see #1532)
the task switcher entry point should not be saved, as it is subject to
change and will be provided on any notification call
the Windows 3.1 Standard Mode supports this API
SeeAlso: AX=160Bh,AX=4B02h
Format of task switcher callback info structure:
Offset Size Description (Table 1530)
00h DWORD pointer to next callback info structure
04h DWORD pointer to notification function (see #1531)
08h DWORD reserved
0Ch DWORD address of zero-terminated list of API info structures
(see #1534)
(Table 1531)
Values task switcher notification function is called with:
AX = function
0000h switcher initialization
Return: AX = status
0000h if OK to load
nonzero to abort task switcher
0001h query suspend
BX = session ID
Return: AX = status
0000h if OK to switch session
0001h if not
0002h suspend session
BX = session ID
interrupts disabled
Return: AX = 0000h if OK to switch session
= 0001h if not
0003h activate session
BX = session ID
CX = session status flags
bit 0: set if first activation of session
bits 1-15: reserved (0)
interrupts disabled
Return: AX = 0000h
0004h session active
BX = session ID
CX = session status flags
bit 0: set if first activation of session
bits 1-15: reserved (0)
Return: AX = 0000h
0005h create session
BX = session ID
Return: AX = 0000h if OK to create session
= 0001h if not
0006h destroy session
BX = session ID
Return: AX = 0000h
0007h switcher termination
BX = flags
bit 0: set if calling switcher is only switcher loaded
bits 1-15: reserved (0)
Return: AX = 0000h
ES:DI -> task switcher entry point (see #1532)
Notes: function 0000h is generally called by the program which controls or
invokes the task switcher, rather than by the task switcher itself;
the entry point supplied to this function is not necessarily the
entry point to the task switcher itself, and may be 0000h:0000h. If
any client indicates that loading is not possible, all clients will
be called with function 0007h; thus it is possible for a client to
receive a termination notice without a corresponding initialization
notice.
except for functions 0002h and 0003h, the notification handler is
called with interrupts enabled and may make any INT 21h function
call; interrupts must not be enabled in functions 0002h and 0003h
function 0007h may be called with ES:DI = 0000h:0000h if the entry
point is no longer valid
--------T-2F4B02BX0000-----------------------
INT 2F - DOS 5+ TASK SWITCHER - INSTALLATION CHECK
AX = 4B02h
BX = 0000h
ES:DI = 0000h:0000h
Return: ES:DI = 0000h:0000h if task switcher not loaded
ES:DI -> task switcher entry point (see #1532) if loaded
AX = 0000h
Notes: the returned entry point is that for the most-recently loaded task
switcher; the entry points for prior task switchers may be determined
with the "get version" call (see #1532)
this function is supported by PC Tools v8+ CPTASK
SeeAlso: AX=4A05h,AX=4B03h
(Table 1532)
Call task switcher entry point with:
AX = 0000h get version
Return: CF clear if successful
AX = 0000h
ES:BX -> task switcher version struct (see #1533)
CF set if unsupported function
AX = 0001h test memory region
ES:DI -> first byte to be tested
CX = size of region to test
Return: CF clear if successful
AX = memory type of tested region
0000h global
0001h global and local
0002h local (replaced on session switch)
CF set if unsupported function
AX = 0002h suspend switcher
ES:DI -> new task switcher's entry point
Return: CF clear if successful
AX = state
0000h switcher has been suspended
0001h switcher not suspended, new switcher must
abort
0002h switcher not suspended, but new switcher
may run anyway
CF set if unsupported function
AX = 0003h resume switcher
ES:DI -> new task switcher's entry point
Return: CF clear if successful
AX = 0000h
CF set if unsupported function
AX = 0004h hook notification chain
ES:DI -> callback info structure to be added to chain
(see #1530)
Return: CF clear if successful
AX = 0000h
CF set if unsupported function
AX = 0005h unhook notification chain
ES:DI -> callback info structure to be removed from chain
(see #1530)
Return: CF clear if successful
AX = 0000h
CF set if unsupported function
AX = 0006h query API support
BX = asynchronous API identifier
Return: CF clear if successful
AX = 0000h
ES:BX -> API info structure (see #1534) for the
client which provides the highest
level of API support
CF set if unsupported function
Format of task switcher version structure:
Offset Size Description (Table 1533)
00h WORD major version of supported protocol (current protocol is 1.0)
02h WORD minor version of supported protocol
04h WORD major version of task switcher
06h WORD minor version of task switcher
08h WORD task switcher ID (see AX=4B03h)
0Ah WORD operation flags
bit 0: set if task switcher disabled
bits 1-15: reserved (0)
0Ch DWORD pointer to ASCIZ task switcher name
("MS-DOS Shell Task Switcher" for DOSSHELL task switcher)
10h DWORD pointer to previous task switcher's entry point or 0000h:0000h
Format of API info structure:
Offset Size Description (Table 1534)
00h WORD size of structure in bytes (000Ah)
02h WORD API identifier
0001h NetBIOS
0002h 802.2
0003h TCP/IP
0004h LAN Manager named pipes
0005h Novell NetWare IPX
04h WORD major version \ of highest version of API for which the support
06h WORD minor version / level specified in the next field is provided
08h WORD support level
0001h minimal support
0002h API-level support
0003h switcher compatibility
0004h seamless compatibility
--------T-2F4B03-----------------------------
INT 2F - DOS 5+ TASK SWITCHER - ALLOCATE SWITCHER ID
AX = 4B03h
ES:DI -> task switcher entry point (see #1532)
Return: AX = 0000h
BX = switcher ID (0001h-000Fh), or 0000h if no more available
Notes: if a task switcher has determined that it is the first to be loaded, it
must allocate an identifier for itself and provide this function to
all subsequent task switchers; if it is not the first to be loaded,
it must call this function to allocate an ID. The switcher ID is
used as the high four bits of all session identifiers to ensure
unique session IDs.
if no more switcher IDs are available, the new task switcher making the
call must terminate or disable itself
the task switcher providing the identifiers may call the new task
switcher's entry point as needed
this call is available from within DOSSHELL even if the task switcher
is not installed
this function is supported by PC Tools v8+ CPTASK, but appears to
always return an ID of 0000h
SeeAlso: AX=4B02h,AX=4B04h
--------T-2F4B04-----------------------------
INT 2F - DOS 5+ TASK SWITCHER - FREE SWITCHER ID
AX = 4B04h
BX = switcher ID
ES:DI -> task switcher entry point (see #1532)
Return: AX = 0000h
BX = status
0000h successful
other error (invalid ID or ID not allocated)
Notes: called by a task switcher when it exits, unless it was the first loaded
and is providing the support for AX=4B03h and AX=4B04h
the task switcher providing the identifiers may call the terminating
task switcher's entry point as needed
this call is available from within DOSSHELL even if the task switcher
is not installed
this call is supported by PC Tools v8+ CPTASK, but appears to return
sucessfully no matter which ID is given
SeeAlso: AX=4B02h,AX=4B03h
--------T-2F4B05-----------------------------
INT 2F C - DOS 5+ TASK SWITCHER - IDENTIFY INSTANCE DATA
AX = 4B05h
ES:BX = 0000h:0000h
CX:DX -> task switcher entry point (see #1532)
Return: ES:BX -> startup info structure (see #1535) or 0000h:0000h
Notes: called by task switcher
clients with instance data should hook this call, pass it through to
the previous handler with unchanged registers using a simulated
interrupt. On return, the client should create a startup info
structure (see #1535), store the returned ES:BX in the "next"
field, and return the address of the created structure in ES:BX
all MS-DOS function calls are available from within this call
SeeAlso: AX=1605h,AX=160Bh,AX=4B02h
Format of task switcher startup info structure:
Offset Size Description (Table 1535)
00h 2 BYTEs major, minor version of info structure (03h,00h)
02h DWORD pointer to next startup info structure or 0000h:0000h
06h DWORD 0000h:0000h (ignored)
0Ah DWORD ignored
0Eh DWORD pointer to instance data records (see #1536)
Format of one instance data record in array:
Offset Size Description (Table 1536)
00h DWORD address of instance data (end of array if 0000h:0000h)
04h WORD size of instance data
--------W-2F4B06-----------------------------
INT 2F - MS Windows - WIN.COM - GET ??? POINTER TO WIN.COM
AX = 4B06h
Return: AX = 0000h
ES:BX -> ??? function in WIN.COM
Note: the entry point is called with
AX = 0001h or 0003h
BX = ???
SeeAlso: AX=4B80h
--------W-2F4B20-----------------------------
INT 2F - MS Windows 3 - WIN.COM - SET PROGRAM TO EXECUTE ON EXIT
AX = 4B20h
Return: AX = 0000h if successful
DX:CX -> 256-byte buffer for pathname and commandline (see #1537)
Note: when the Windows function ExitWindows is called with an exit code of
44h, WIN.COM executes the program specified in the returned buffer
and then restarts Windows
Format of WIN.COM buffer:
Offset Size Description (Table 1537)
00h 128 BYTEs ASCIZ pathname of program to execute
80h 128 BYTEs commandline for program
--------W-2F4B80-----------------------------
INT 2F - MS Windows - WSWAP.EXE - RESET INTERNAL VARIABLES
AX = 4B80h
Return: nothing
Note: called by WINOLDAP.MOD
SeeAlso: AX=4B06h
--------p-2F4C-------------------------------
INT 2F U - Advanced Power Management
AH = 4Ch
AL = function
00h version check
01h suspend system requested
FFh suspend/resume battery notification
???
Return: ???
----------2F4D-------------------------------
INT 2F U - ???
AH = 4Dh
???
Return: ???
Note: reportedly called by Kana Kanji Converter and MSKK
--------N-2F4E53BL00-------------------------
INT 2F - SilverNET v2+ - INSTALLATION CHECK
AX = 4E53h ("NS")
BL = 00h (function "installation check")
BH = module ID (see #1538)
Return: AX = 0000h if specified module installed
BX = 4E53h if installed
Program: SilverNET is an SMB-compatible peer-to-peer NOS for DOS or
Windows systems, by Net-Source, Inc. of Santa Clara, CA.
SeeAlso: AX=4E53h/BL=01h,AX=4E53h/BL=02h,AX=B800h,AX=B809h
(Table 1538)
Values for SilverNET module ID:
01h SilverCACHE
02h Workstation
03h NetBIOS
04h Peer
20h NS Share
80h NetWare help TSR
--------N-2F4E53BL01-------------------------
INT 2F - SilverNET - GET RUNTIME PARAMETER
AX = 4E53h ("NS")
BL = 01h (function "get runtime parameter")
BH = module ID (see #1538)
CX = parameter index (see #1539,#1541,#1542)
Return: AX = WORD value at specified index (see #1540)
Desc: retrieve a word of data from the specified SilverNET module
(Table 1539)
Values for SilverNET Peer parameter index (* = read-only):
00h * maximum outstanding SMB buffers
02h * maximum logged-in nodes
04h * number of shareable resources
06h * number of characters to print per time slice
08h * number of printers that can be shared
0Ah * number of nodes logged in
0Ch * number of files to allow opened
0Eh how fast to despool (/PSLICE)
10h audit flag
24h * far pointer to resource table (each resource is 96 bytes in length)
32h * far pointer to SFT (internal if SilverNET files > CONFIG.SYS files,
else DOS SFT)
36h spool flags (see #1540)
Bitfields for spool flags:
Bit(s) Description (Table 1540)
0 LPT1 needs despooling
1 LPT2 needs despooling
2 LPT2 needs despooling
4 COM1 needs despooling
5 COM2 needs despooling
6 COM3 needs despooling
(Table 1541)
Values for NS Share parameter index (* = read-only):
00h version number (high byte = minor, low byte = major)
10h * segment of first lock record (other records in consecutive paragraphs)
(if PSP field = 0000h, lock record is free)
12h * maximum possible number of lock records
14h * starting segment of sharing buffer
(NS Share's sharing records are identical to DOS SHARE except that
fields which are normally offsets into SHARE are segment numbers)
18h * size of sharing buffer in paragraphs
1Ah * total free paragraphs in sharing buffer
1Ch * current number of shared files
1Eh * current number of locked records
(Table 1542)
Values for Workstation parameter index (* = read-only):
00h version number (high byte = minor, low byte = major)
02h * size of each network buffer for file operations
04h * number of redirector file buffers
06h * size of each print cache buffer
08h * number of network LPT printers
0Ch flush time in ticks (idle time on network printer before flushing)
0Eh (16 WORDs) last active time for each printer
2Eh * stub segment if program split into two parts
60h receive name number for datagram listens
62h * 18-byte machine name
74h * LASTDRIVE (01h = A:, etc.)
7Ch row number of message box on screen
7Eh message time in clock ticks
82h * number of network adapters in use
84h station ID broadcast flag (never set on redirectors)
96h * NetBIOS names left
98h * NCBs left
9Ah * sessions left
A2h * total number of network printers (LPT+COM)
A4h * number of serial network printers
A8h * segment containing file cache buffers
AAh * segment containing print cache buffers
ACh * bytes remaining free in HMA before program loaded
AEh * start of free memory in HMA
B2h * flag: using HMA
--------N-2F4E53BL02-------------------------
INT 2F - SilverNET - SET RUNTIME PARAMETERS
AX = 4E53h ("NS")
BL = 02h (function "set runtime parameters")
BH = module ID (see #1538)
CX = parameter index (see #1541,#1542)
DX = new value for specified parameter
Desc: set a WORD value in the specified SilverNET module
Note: not all indexed parameters are writable; modifying a read-only
parameter can result in system crashes
SeeAlso: AX=4E53h/BL=00h,AX=4E53h/BL=01h
--------N-2F5100-----------------------------
INT 2F U - ODIHLP.EXE - INSTALLATION CHECK
AX = 5100h
Return: AL = FFh if installed
BX = 0000h
DX:SI -> signature string "ODI$HLP$"
Program: ODIHLP is a real-mode helper allowing the Windows for Workgroups 3.11
protected-mode NDIS3 protocol to work with real-mode ODI drivers
and LSL.COM
Note: the returned signature string might be the first field of a structure
SeeAlso: AX=C000h"LSL.COM"
--------k-2F5200-----------------------------
INT 2F - JAM.SYS v1.10+ - "GetVersion" - INSTALLATION CHECK
AX = 5200h
Return: AH = 80h (successful) if installed
BX = internal JAM.SYS version number
CX = size of JAMINFO structure (see #1543,#1544)
DX = JAM.SYS segment address
Program: JAM.SYS is a main component of the JAM Real-Time Data Compression
Utilities by George A. Reznik and friends (JAM Software).
SeeAlso: AX=5201h
Format of JAMINFO v1.10 structure:
Offset Size Description (Table 1543)
00h 25 BYTEs extended BIOS parameter block (BPB)
19h 11 BYTEs ???
25h DWORD total number of sectors in JAM archive file
(size of compressed data area)
29h BYTE flags (see #1545)
2Ah 127 BYTEs full JAM archive file name
A9h WORD the number of fragments in archive file
ABh 96 BYTEs archive file fragmentation list -
array of 16 FRAGMENT structures (see #1546)
10Bh DWORD address of the host-drive DPB (Drive Parameter Block)
10Fh DWORD number of free sectors in JAM archive file
113h WORD device status word (see #1547)
SeeAlso: #1544
Format of JAMINFO v1.20 structure:
Offset Size Description (Table 1544)
00h 25 BYTEs extended BIOS parameter block (BPB)
19h BYTE physical driver number
1Ah BYTE reserved
1Bh BYTE extended boot record signature
1Ch DWORD volume serial number
20h 11 BYTEs volume label
2Bh 8 BYTEs file system ID
33h DWORD total number of sectors in JAM archive file
(size of compressed data area)
37h BYTE flags (see #1545)
38h 128 BYTEs full JAM archive file name
B8h WORD the number of fragments in archive file
BAh 96 BYTEs archive file fragmentation list -
array of 16 FRAGMENT structures (see #1546)
11Ah DWORD address of the host-drive DPB (Drive Parameter Block)
11Eh DWORD number of free sectors in JAM archive file
122h WORD device status word (see #1547)
Note: the first 33h bytes are copied from the archive file's boot sector
SeeAlso: #1543
Bitfields for JAMINFO flags:
Bit(s) Description (Table 1545)
2-0 reserved
3 (v1.20+)
4 enable direct write requests (Int 26h, non-DOS requests, etc.)
5 read-only mode
6 no write-behind caching
7 full undelete-compatible allocation strategy
SeeAlso: #1543,#1544
Format of JAM FRAGMENT structure:
Offset Size Description (Table 1546)
00h WORD starting sector (low word)
02h BYTE starting sector (high byte)
03h WORD size of fragment (low word)
05h BYTE size of fragment (high byte)
SeeAlso: #1543,#1544
(Table 1547)
Values for JAM.SYS status (high byte):
00h successful
01h drive is not a JAM drive
02h drive is already attached
03h archive file cluster size value is larger than driver's one
04h drive is not attached
05h drive is locked
06h drive is not locked
07h bad physical-level request
08h host drive reading/writing error
09h bad entries in JAM descriptor table
0Ah compressed data integrity error
0Bh archive file overflow
0Ch bad DOS request
0Dh incorrect parameters in JAMINFO structure
Note: the low byte of the status is the DOS error code for the Host drive
SeeAlso: #1383 at INT 2F/AX=0802h
--------k-2F5201-----------------------------
INT 2F - JAM.SYS v1.10+ - "GetInfo" - GET COMPRESSED DRIVE INFORMATION
AX = 5201h
DL = compressed drive number (0-default, 1-A:, etc.)
DS:BX -> buffer for JAMINFO structure (see #1543,#1544)
Return: AH = status (00h,01h) (see #1547)
SeeAlso: AX=5200h
--------k-2F5202-----------------------------
INT 2F - JAM.SYS v1.10+ - "Attach" - MOUNT COMPRESSED DRIVE
AX = 5202h
DL = drive number (0-default, 1-A:, etc.) to attach to the JAM
archive file
DS:BX -> pointer to JAMINFO structure (see #1543,#1544), which
contains parameters of the JAM file to mount, and pointer
to the host drive DPB (i.e. DPB of the drive on which the
JAM file is located)
Return: AH = status (00h,02h,03h,08h,09h,0Dh) (see also #1547)
03h archive file cluster size value is larger than driver's - not
mounted
09h bad entries in JAM descriptor table - file mounted read-only
AL = host drive error code (see #1383 at INT 2F/AX=0802h)
SeeAlso: AX=5203h
--------k-2F5203-----------------------------
INT 2F - JAM.SYS v1.10+ - "Detach" - UNMOUNT COMPRESSED DRIVE
AX = 5203h
DL = drive number (0-default, 1-A:, etc.) to detach
Return: AH = status (00h,01h,04h,05h,08h,09h,0Bh,0Dh) (see #1547)
AL = host drive error code (see #1383 at INT 2F/AX=0802h)
SeeAlso: AX=5202h
--------k-2F5204-----------------------------
INT 2F - JAM.SYS v1.10+ - "Lock" - LOCK COMPRESSED DRIVE
AX = 5204h
DL = drive number (0-default, 1-A:, etc.) to lock
Return: AH = status (00h,01h,04h,05h,08h,09h,0Bh,0Dh) (see #1547)
AL = host drive error code (see #1383 at INT 2F/AX=0802h)
SeeAlso: AX=5205h, AX=5206h, AX=5207h
--------k-2F5205-----------------------------
INT 2F - JAM.SYS v1.10+ - "UnLock" - UNLOCK COMPRESSED DRIVE
AX = 5205h
DL = drive number (0-default, 1-A:, etc.) to unlock
Return: AH = status (00h,01h,04h,06h,08h,09h,0Dh) (see #1547)
AL = host drive error code (see #1383 at INT 2F/AX=0802h)
SeeAlso: AX=5204h, AX=5206h, AX=5207h
Note: Lock and UnLock functions were added to the JAM API to prevent
asynchronous physical-level access (see AX=5206h,AX=5207h) to
compressed data on JAM drives. In other words, two or more programs
which use JAM API (say, JMAX optimizer and JCHKDSK - disk checker)
cannot be run on the same JAM drive simultaneously.
--------k-2F5206-----------------------------
INT 2F - JAM.SYS v1.10+ - "Read" - PHYSICAL READ DATA FROM JAM ARCHIVE
AX = 5206h
DL = drive number (0-default, 1-A:, etc.)
DS:BX -> disk transfer packet (see #1548)
Return: AH = status (00h,01h,04h,06h,07h,08h,0Dh) (see #1547)
AL = host drive error code (see #1383 at INT 2F/AX=0802h)
Program: JAM.SYS is a main component of the JAM Real-Time Data Compression
Utilities by George A. Reznik and friends (JAM Software).
SeeAlso: AX=5207h
Format of disk transfer packet:
Offset Size Description (Table 1548)
00h DWORD sector number
04h WORD number of sectors to read(write)
06h DWORD transfer address
--------k-2F5207-----------------------------
INT 2F - JAM.SYS v1.10+ - "Write" - PHYSICAL WRITE DATA TO JAM ARCHIVE
AX = 5207h
DL = drive number (0-default, 1-A:, etc.)
DS:BX -> disk transfer packet (see #1548)
Return: AH = status (00h,01h,04h,06h,07h,08h,0Dh) (see #1547)
AL = host drive error code (see #1383 at INT 2F/AX=0802h)
SeeAlso: AX=5206h
--------p-2F53-------------------------------
INT 2F U - POWER.EXE - APM event broadcasting???
AH = 53h
AL = event???
05h CPU idle
0Bh PM event broadcast API
Return: ???
Note: called by MS Windows 3.1 POWER.DRV; hooked by MS Mouse driver v8.20+
and PC-Cache v8.0
SeeAlso: AX=530Bh,AH=54h,INT 33/AX=002Fh
--------p-2F530B-----------------------------
INT 2F U - ??? (MOUSEPWR.COM, others) - ???
AX = 530Bh
BX = subfunction
0003h ???
0004h ???
???
Return: ???
Note: it appears that subfunction 0003h reads or restores the current mouse
settings (the MS Mouse driver hooks AX=530Bh), and 0004h might be
the converse
--------p-2F5400-----------------------------
INT 2F U - POWER.EXE - INSTALLATION CHECK
AX = 5400h
Return: AX = POWER.EXE version (AH = major, AL = minor) if installed
BX = 504Dh ("PM")
CF clear
Note: called by MS Windows 3.1 POWER.DRV
SeeAlso: AH=53h,AX=5401h,AX=5402h,AX=5481h,AX=5482h
--------p-2F5401-----------------------------
INT 2F U - POWER.EXE - GET/SET POWER STATUS
AX = 5401h
BH = function
00h get status
Return: BL = current power management status (see #1549)
01h set status
BL = new power managment status (see #1549)
Return: AX = function status (see #1550)
Note: called by MS Windows 3.1 POWER.DRV
SeeAlso: AH=53h,AX=5400h,AX=5402h,AX=5403h
Bitfields for power management status:
Bit(s) Description (Table 1549)
0 POWER.EXE power management enabled
1 APM firmware power management enabled
2-7 reserved (0)
Notes: bit 1 is ignored if there is no APM firmware
bits 1-0: 00 = POWER OFF, 10 = POWER STD, 11 = POWER ADV
(Table 1550)
Values for POWER.EXE function status:
0000h successful
0002h "ERROR_PM_ALREADY_CONNECTED"
0003h "ERROR_PM_NOT_CONNECTED"
0087h "ERROR_PM_INVALID_PARAMETER"
--------p-2F5402-----------------------------
INT 2F U - POWER.EXE - GET/SET IDLE DETECTION STRATEGY
AX = 5402h
BH = subfunction
00h get
other set
BL = detection strategy (00h-0Fh or FFh)
Return: BX = current/new detection strategy
SeeAlso: AH=53h,AX=5400h,AX=5401h,AX=5481h,AX=5482h
--------p-2F5403-----------------------------
INT 2F U - POWER.EXE - GET/SET ADVANCED POWER MANAGEMENT SETTING
AX = 5403h
BX = new power management setting or 0000h to get current setting
Return: AX = status
0000h successful
BX = power management setting (see #1551)
other error code
SeeAlso: AX=5401h,AX=5480h
(Table 1551)
Values for power management setting:
0001h-0005h "min"
0006h "reg"
0007h-0008h "max"
--------t-2F5453-----------------------------
INT 2F - TesSeRact RAM-RESIDENT PROGRAM INTERFACE
AX = 5453h
BX = subfunction
00h installation check
CX = 0000h
DS:SI -> 8-char blank-padded name (see #1552)
Return: AX = FFFFh installed
CX = ID number of already-installed copy
AX = anything else, not installed
CX = ID number for TSR when installed
01h get user parameters
CX = TSR ID number
Return: AX = status
0000h successful
ES:BX -> user parameter block (see #1553)
nonzero failed
02h check if hotkey in use
CL = scan code of hot key
Return: AX = FFFFh hot key conflicts with another TSR
otherwise safe to use the hotkey
03h replace default critical error handler
CX = TSR ID number
DS:SI -> new routine for INT 24h
Return: AX = nonzero, unable to install new handler
04h get internal data area
CX = TSR ID number
Return: AX = status
0000h successful
ES:BX -> TSR's internal data area (see #1554)
nonzero, TSR not found
05h set multiple hot keys
CX = TSR ID number
DL = number of additional hot keys to allocate
DS:SI -> table of hot keys
BYTE hotkey scan code
BYTE hotkey shift state
BYTE flag value to pass to TSR (nonzero)
Return: AX = nonzero, unable to install hot keys
06h - 0Fh reserved
10h enable TSR
CX = TSR ID number
Return: AX = nonzero, unable to enable
11h disable TSR
CX = TSR ID number
Return: AX = nonzero, unable to disable
12h unload TSR
CX = TSR ID number
Return: AX = nonzero, invalid TSR number
Note: if any interrupts used by TSR have been grabbed by
another TSR, the TesSeRact routines will wait until
it is safe to remove the indicated TSR from memory
13h restart TSR
CX = TSR ID number of TSR which was unloaded but is still in
memory
Return: AX = nonzero, unable to restart TSR
14h get status word
CX = TSR ID number
Return: AX = FFFFh invalid ID number
= other, successful
BX = bit flags
15h set status word
CX = TSR ID number
DX = new bit flags
Return: AX = nonzero, unable to set status word
16h get INDOS state at popup
CX = TSR ID number
Return: AX = 0000h successful
BX = value of INDOS flag
17h - 1Fh reserved
20h call user procedure
CX = TSR ID number
ES:DI -> user-defined data
Return: AX = 0000h successful
21h stuff keystrokes into keyboard buffer
CX = TSR ID number
DL = speed
00h stuff keystrokes only when buffer is empty
01h stuff up to four keystrokes per clock tick
02h stuff up to 15 keystrokes per clock tick
DH = scan code flag
if zero, buffer contains alternating ASCII and scan codes
if nonzero, buffer contains only ASCII codes
SI = number of keystrokes
ES:DI -> buffer to stuff
Return: AX = 0000h success
F0F0h user aborted with ^C or ^Break
other unable to stuff keystrokes
22h (v1.10) trigger popup
CX = TSR ID number
Return: AX = 0000h success, TSR will either pop up or beep to
indicate that it is unable to pop up
nonzero invalid ID number
23h (v1.10) invoke TSR's background function
CX = TSR ID number
Return: AX = 0000h success
FFFFh not safe to call background function
nonzero invalid ID number
24h - 2Fh reserved
Notes: Borland's THELP.COM popup help system for Turbo Pascal and Turbo C
(versions 1.x and 2.x only) fully supports the TesSeRact API, as
do the SWAP?? programs by Innovative Data Concepts.
AVATAR.SYS supports functions 00h and 01h (only the first three fields
of the user parameter block) using the name "AVATAR "
SeeAlso: AX=CAFEh,INT 16/AX=55FFh,INT 2D"AMIS"
Index: installation check;TesSeRact TSR interface|uninstall;TesSeRact
(Table 1552)
Values for TesSeRact names:
"AVATAR " AVATAR.SYS
"QeditTSR" TSR version of SemWare's Qedit editor
"SCRNBLNK" Trusted Access screen blanker
Format of TesSeRact User Parameter Block:
Offset Size Description (Table 1553)
00h 8 BYTEs blank-padded TSR name
08h WORD TSR ID number
0Ah DWORD bitmap of supported functions
0Eh BYTE scan code of primary hotkey
00h = pop up when shift states match
FFh = no popup (if shift state also FFh)
0Fh BYTE shift state of primary hotkey
FFh = no popup (if scan code also FFh)
10h BYTE number of secondary hotkeys
11h DWORD pointer to extra hotkeys set by func 05h
15h WORD current TSR status flags
17h WORD PSP segment of TSR
19h DWORD DTA for TSR
1Dh WORD default DS for TSR
1Fh DWORD stack at popup
23h DWORD stack at background invocation
Index: hotkeys;TesSeRact TSR interface
Format of TSR internal data area:
Offset Size Description (Table 1554)
00h BYTE revision level of TesSeRact library
01h BYTE type of popup in effect
02h BYTE INT 08 occurred since last invocation
03h BYTE INT 13 occurred since last invocation
04h BYTE active interrupts
05h BYTE active soft interrupts
06h BYTE DOS major version
07h BYTE how long to wait before popping up
08h DWORD pointer to INDOS flag
0CH DWORD pointer to DOS critical error flag
10h WORD PSP segment of interrupted program
12h WORD PSP segment of prog interrupted by INT 28
14h DWORD DTA of interrupted program
18h DWORD DTA of program interrupted by INT 28
1Ch WORD SS of interrupted program
1Eh WORD SP of interrupted program
20h WORD SS of program interrupted by INT 28
22h WORD SP of program interrupted by INT 28
24h DWORD INT 24 of interrupted program
28h 3 WORDs DOS 3+ extended error info
2Eh BYTE old BREAK setting
2Fh BYTE old VERIFY setting
30h BYTE were running MS WORD 4.0 before popup
31h BYTE MS WORD 4.0 special popup flag
32h BYTE enhanced keyboard call in use
33h BYTE delay for MS WORD 4.0
11 times (for INTs 08h,09h,13h,16h,1Ch,21h,28h,2Fh,1Bh,23h, and 24h):
DWORD old interrupt vector
BYTE interrupt number
WORD offset in TesSeRact code segment of new interrupt handler
--------p-2F5480-----------------------------
INT 2F U - POWER.EXE - GET/SET ???
AX = 5480h
BX = direction
0000h get
other set
CX = size of buffer (at least 0010h)
DS:SI -> buffer
Return: AX = status
0000h successful
other error code
SeeAlso: AX=5400h,AX=5481h,AX=548Fh
--------p-2F5481-----------------------------
INT 2F U - POWER.EXE - GET STATISTICS
AX = 5481h
BX = which statistics
0000h idle detection
0001h APM statistics
CX = length of buffer in bytes
DS:SI -> buffer for statistics (see #1555,#1556)
Return: AX = status
0000h successful
0071h "ERROR_PM_BUFFER_TOO_SMALL"
0087h "ERROR_PM_INVALID_PARAMETER"
SeeAlso: AH=53h,AX=5400h,AX=5480h,AX=5402h,AX=5482h
Format of POWER.EXE idle detection statistics:
Offset Size Description (Table 1555)
00h DWORD "CPU_ON_TIME" total time CPU is active with POWER.EXE idle
detection enabled, in timer ticks
04h DWORD "CPU_IDLE_TIME" timer ticks during which CPU was idle
(divide by previous to get idle rate)
08h DWORD total idle calls
0Ch DWORD "TOTAL_APP_IDLE" total INT 2Fh idle calls
10h DWORD "TOTAL_DOS_YIELD" total INT 28h idle calls
14h DWORD "TOTAL_KEY_IDLE" total INT 16h idle calls
18h DWORD "TOTAL_DOS_IDLE" total INT 2Ah idle calls
Format of APM statistics:
Offset Size Description (Table 1556)
00h DWORD "RESUME_COUNT" total number of resumes since last APM_ENABLE
--------p-2F5482-----------------------------
INT 2F U - POWER.EXE - GET/SET APM POLLING FREQUENCY
AX = 5482h
BX = new polling frequency or 0000h to get current frequency
Return: AX = 0000h (successful)
BX = current frequency if BX=0000h on entry
SeeAlso: AH=53h,AX=5400h,AX=5401h,AX=5480h,AX=5481h,AX=548Fh
--------p-2F548F-----------------------------
INT 2F U - POWER.EXE - GET/SET ???
AX = 548Fh
BX = ??? or 0000h to get current ???
Return: AX = 0000h (successful)
BX = current ???
CX = ???
SeeAlso: AX=5400h,AX=5480h,AX=5482h
--------l-2F5500-----------------------------
INT 2F U - DOS 5+ - COMMAND.COM INTERFACE
AX = 5500h
Return: AX = 0000h if an instance of COMMAND.COM is already running
DS:SI -> entry point table
Notes: used to access the shareable portion of COMMAND.COM, which may have
been moved into the HMA; only the primary COMMAND.COM retains this
portion
procedures called from a dispatcher in COMMAND's resident portion;
most assume that the segment address of the resident portion is on
the stack and are thus not of general use
SeeAlso: AX=5501h
--------l-2F5501-----------------------------
INT 2F U - DOS 5+ - ROM COMMAND.COM INTERFACE
AX = 5501h
Return: ???
Note: used to determine whether the caller is the first instance of ROM
COMMAND.COM
SeeAlso: AX=5500h
--------R-2F5600-----------------------------
INT 2F - INTERLNK - INSTALLATION CHECK
AX = 5600h
DX = magic value FFFFh
BL = instance number (00h = any, 01h = first loaded, etc.)
Return: AL = FFh if installed
BL = instance number
CX = ??? (apparently always 0001h)
DX = resident CS of driver, DX:0000h -> header (see #1557)
SeeAlso: AX=5601h,AX=5602h,INT 60/AX=0000h
Format of Interlnk device driver header:
Offset Size Description (Table 1557)
00h DWORD pointer to next driver, offset=FFFFh if last driver
04h WORD device attributes (see #0859,#0860)
06h WORD device strategy entry point
08h WORD device interrupt entry point
0Ah 8 BYTEs character device name "NUL2 "
12h 165 BYTEs ???
B7h 67 BYTEs fully qualified Interlnk filename
FAh 6 BYTEs ???
100h DWORD pointer back to Interlnk filename at offset B7h
104h 8 BYTEs ???
10Ch BYTE total number of redirected drives
10Dh BYTE first local drive number (0=A:)
10Eh BYTE printer redirection (0=no, 1=yes)
10Fh BYTE ???
110h 3 BYTEs LPT1...3 status (0FFh=invalid)
113h 26 BYTEs remote drive number (0=A:, 0FEh=unused) (see note below)
12Dh 26 BYTEs always 0FEh ???
147h 26 BYTEs always 0FFh ???
Note: to obtain the remote drive number, subtract the value at offset 10Ch
from the local drive number before indexing into the table at 113h
(example: if local drives F, G, H are remote drives C, F, E then
the first three bytes at offset 113h are 02h, 05h, 04h)
for each instance of Interlnk, an extra device driver is loaded, but
all have the same device name NUL2
SeeAlso: #0858 at INT 21/AH=52h
--------R-2F5601-----------------------------
INT 2F - INTERLNK - CHECK IF REDIRECTED DRIVE
AX = 5601h
DX = magic value FFFFh
BH = drive number (0=A:)
BL = 00h
Return: (as for AL=00h if redirected drive)
SeeAlso: AX=5600h
--------R-2F5602-----------------------------
INT 2F - INTERLNK - GET ???
AX = 5602h
DX = magic value FFFFh
Return: CX = ???
SeeAlso: AX=5600h
----------2F57-------------------------------
INT 2F U - ???
AH = 57h
???
Return: ???
Note: reportedly used by Iomega Corp.
--------c-2F5758BX4858-----------------------
INT 2F U - Helix Multimedia Cloaking - CACHECLK - INSTALLATION CHECK
AX = 5758h
BX = 4858h ('HX')
DX = 4443h ('DC')
CX <> 5758h
Return: BX = 6878h if installed
DX = 6463h if installed
CX = version (CH=major,CL=minor)
Program: CACHECLK is a 'Cloaked' disk cache by Helix Software
Note: returns with registers unchanged if CX=5758h on entry
SeeAlso: INT 16/AX=5758h/BX=4858h,INT 2F/AX=4310h"Cloaking"
--------X-2F5D00-----------------------------
INT 2F U - PCMCIA - AWARD PCDISK - GET INFO FROM DRIVER ???
AX = 5D00h
Return: ES:BX -> ???
Note: supported by Ventura Micro / Award PCDISK.EXE v1.02c PCMCIA/ATA driver
SeeAlso: AX=5D01h,INT 21/AX=440Dh
--------X-2F5D01-----------------------------
INT 2F U - PCMCIA - AWARD PCDISK - PUT INFO INTO DRIVER ???
AX = 5D01h
ES:BX -> ???
Return: nothing
Note: supported by Ventura Micro / Award PCDISK.EXE v1.02c PCMCIA/ATA driver
SeeAlso: AX=5D00h,INT 21/AX=440Dh
--------s-2F60FFDL00-------------------------
INT 2F U - IPLAY v1.00b - INSTALLATION CHECK
AX = 60FFh
DL = 00h (function number)
BX = 5344h ('SD')
CX = 4D50h ('MP')
Return: AX = 4F4Bh ('OK') if installed
Program: IPLAY is the Inertia Player by Prime and Excalibur for .MODules
(digitized music files)
Note: in version 1.00b, any value for DL except 01h invokes this function
SeeAlso: AX=60FFh/DL=01h
--------s-2F60FFDL01-------------------------
INT 2F U - IPLAY v1.00b - GET DATA SEGMENT
AX = 60FFh
DL = 01h (function number)
BX = 5344h ('SD')
CX = 4D50h ('MP')
Return: AX = data segment
Program: IPLAY is the Inertia Player by Prime and Excalibur for .MODules
(digitized music files)
SeeAlso: AX=60FFh/DL=00h
--------v-2F6282-----------------------------
INT 2F U - PC Tools v7.0+ VDEFEND, VSAFE, VWATCH, DATAMON - SET ??? ADDRESS
AX = 6282h
CX:DX -> ??? or 0000h:0000h
DI = segment of ??? record (see #1558) or 0000h/FFFFh to ignore
Return: BX = 0062h
Note: if CX:DX = 0000h:0000h on entry, the ??? address is not changed
(DATAMON only)
SeeAlso: INT 13/AH=FAh"VSAFE",INT 21/AH=FAh"VDEFEND"
Format of VSAFE/VWATCH record:
Offset Size Description (Table 1558)
00h DWORD ???
04h WORD offset of ??? in record's segment
VSAFE 2.0 sets byte at +01h to 56h or 58h
VWATCH 2.1 sets byte at +02h to 56h or 58h
06h 2 BYTEs ???
08h BYTE ??? (01h/other)
--------v-2F6284BX0000-----------------------
INT 2F U - PC Tools v7-8 DATAMON, v9+ DPROTECT - INSTALLATION CHECK
AX = 6284h
BX = 0000h
CX = 0000h
Return: AX = segment of resident code
BX = 5555h
CX = 5555h
Note: also supported by DOS 6 UNDELETE which is licensed from PC Tools
SeeAlso: AX=6284h/BX=0001h,INT 16/AX=FFA3h
--------v-2F6284BX0001-----------------------
INT 2F U - PC Tools v7-8 DATAMON, v9+ DPROTECT - GET ???
AX = 6284h
BX = 0001h
CX = 0001h
Return: AX:BX -> ??? data (see #1559)
CX = BX
SeeAlso: AX=6284h/BX=0000h
Format of DPROTECT data for v9.0:
Offset Size Description (Table 1559)
00h 5 BYTEs ???
05h WORD resident code segment (may be segment of DWORD at +03h)
07h DWORD -> FAR function to sound alert tone
???
--------v-2F6284BX0002-----------------------
INT 2F U - PC Tools v7-8 DATAMON, v9+ DPROTECT - GET OPTIONS
AX = 6284h
BX = 0002h
CX = 0002h
Return: AX = options (see #1560)
BX = ??? (0000h for v9)
CX = AX
DX = BX
Note: also supported by DOS 6 UNDELETE which is licensed from PC Tools
SeeAlso: AX=6284h/BX=0000h,AX=6284h/BX=0003h
Bitfields for DATAMON/DPROTECT options:
Bit(s) Description (Table 1560)
1 ???
12 disabled
13 using Delete Sentry
14 using Delete Tracker
--------v-2F6284BX0003-----------------------
INT 2F U - PC Tools v7-8 DATAMON, v9+ DPROTECT - SET OPTION??? FLAGS
AX = 6284h
BX = 0003h
CX = flags (see #1561)
DX = flags
bit 15: ???
Note: v9 DPROTECT only checks bit 12 of CX, and ignores DX entirely
SeeAlso: AX=6284h/BX=0002h
Bitfields for DATAMON/DPROTECT CX flags:
Bit(s) Description (Table 1561)
3 ???
5 ???
10 ???
12 disable DATAMON/DPROTECT
--------v-2F6284BX0004-----------------------
INT 2F U - PC Tools v8 DATAMON, v9+ DPROTECT - ???
AX = 6284h
BX = 0004h
CX = 0004h
Return: AX = 5555h
BX = ??? (0800h)
CX = ??? (FCCCh for v8, FCCBh for v9)
--------V-2F6400-----------------------------
INT 2F - SCRNSAV2.COM - INSTALLATION CHECK
AX = 6400h
Return: AL = installation state
00h not installed
FFh installed
Program: SCRNSAV2.COM is a screen saver for PS/2s with VGA by Alan Ballard
SeeAlso: INT 10/AX=5555h,INT 14/AX=AA01h
Index: screen saver;SCRNSAV2
--------N-2F7000-----------------------------
INT 2F - License Service API - INSTALLATION CHECK
AX = 7000h
CX = license server index (0000h to 001Fh)
Return: AL = status
00h not installed
FFh installed
Notes: The License Service API is being maintained by Microsoft but is being
supported by a large number of companies including Apple, Banyan,
DEC, HP, Lotus, Microsoft, Novell, Software Publishers Association,
and Wordperfect (not a complete list!)
Each license service provider must search for the next free index
slot to use
SeeAlso: AX=7001h,AX=7003h,AX=7004h,AX=7005h
--------N-2F7001-----------------------------
INT 2F - License Service API - REQUEST LICENSE
AX = 7001h
CX = license server index (0000h to 001Fh)
DS:DX -> SLSREQUEST structure (see #1562)
Return: AX = status
0000h success
else provider error code
ES:BX = provider specific handle for the license context
SeeAlso: AX=7002h,AX=7004h,AX=7005h
Format of License Service SLSREQUEST structure:
Offset Size Description (Table 1562)
00h DWORD (ret) status code
04h DWORD (ret) handle identifying context
08h DWORD (call) address of Publisher string
0Ch DWORD (call) address of Product string
10h DWORD (call) address of Version string
14h DWORD units required
18h DWORD address of comment string
1Ch DWORD address of SLSCHALLENGE structure (see #1563)
Format of License Service SLSCHALLENGE structure:
Offset Size Description (Table 1563)
00h DWORD algorithm (currently always 1)
04h DWORD secret to be challenged (1-255)
08h DWORD size of challenge in bytes (1-255)
0Ch N BYTEs challenge data
--------N-2F7002-----------------------------
INT 2F - License Service API - RELEASE LICENSE
AX = 7002h
CX = license server index (0000h to 001Fh)
DS:DX -> SLSRELEASE structure (see #1564)
ES:BX = provider specific handle for the license context
Return: AL = status
00h not installed
FFh installed
SeeAlso: AX=7001h,AX=7005h
Format of License Service SLSRELEASE structure:
Offset Size Description (Table 1564)
00h DWORD handle indentifying license context
04h DWORD total units consumed
08h DWORD address of comment string
--------N-2F7003-----------------------------
INT 2F - License Service API - UPDATE
AX = 7003h
CX = license server index (0000h to 001Fh)
DS:DX -> SLSUPDATE structure (see #1565)
ES:BX = provider specific handle for the license context
Return: AL = status
00h not installed
FFh installed
SeeAlso: AX=7004h,AX=7005h
Format of License Service SLSUPDATE structure:
Offset Size Description (Table 1565)
00h DWORD (ret) status code
04h DWORD (call) handle identifying license context
08h DWORD (call) total units consumed
0Ch DWORD additional units required
10h DWORD address of comment string
14h DWORD address of SLSCHALLENGE structure (see #1563)
--------N-2F7004-----------------------------
INT 2F - License Service API - GET ERROR
AX = 7004h
CX = license server index (0000h to 001Fh)
DS:DX -> SLSGETERROR structure (see #1566)
ES:BX = provider specific handle for the license context
Return: AL = status
00h not installed
FFh installed
SeeAlso: AX=7000h,AX=7001h
Format of License Service SLSGETERROR structure:
Offset Size Description (Table 1566)
00h DWORD (ret) status code
04h DWORD handle identifying license context
08h DWORD error code
0Ch DWORD buffer size in bytes
10h N BYTEs data buffer
--------N-2F7005-----------------------------
INT 2F - License Service API - QUERY LICENSE
AX = 7005h
CX = license server index (0000h to 001Fh)
DS:DX -> SLSQUERY structure (see #1567)
ES:BX = provider specific handle for the license context
Return: AL = status
00h not installed
FFh installed
SeeAlso: AX=7001h,AX=7002h
Format of License Service SLSQUERY structure:
Offset Size Description (Table 1567)
00h DWORD (ret) status code
04h DWORD handle identifying license context
08h DWORD information index
0Ch DWORD buffer size in bytes
10h N BYTEs data buffer
--------K-2F7041BX4B70-----------------------
INT 2F U - HP 200LX - KEY200 - INSTALLATION CHECK
AX = 7041h
BX = 4B70h
Return: BX = 7965h if keyboard remapper KEY200.COM installed
--------d-2F7200-----------------------------
INT 2F - SRDISK v1.30+ - INSTALLATION CHECK
AX = 7200h
Return: AL = FFh if installed
ES = segment of device driver header (see #1568)
Program: SRDISK is a freeware resizeable RAMdisk by Marko Kohtala
SeeAlso: AX=7201h
Format of SRDISK device driver header:
Offset Size Description (Table 1568)
00h 10 BYTEs same as standard device driver header
(see #0858 at INT 21/AH=52h)
0Ah BYTE number of subunits (drives) supported by driver
0Bh 3 BYTEs signature "SRD"
0Eh 4 BYTEs memory type string ("XMS "/"EMS ")
12h 4 BYTEs ASCII driver version string "N.NN"
16h BYTE 00h
17h BYTE configuration format version (currently 00h or 01h)
18h WORD offset of drive configuration data
--------d-2F7201-----------------------------
INT 2F - SRDISK v2.02 - GET CODE/DATA SEGMENT
AX = 7201h
Return: AL = FFh if installed
ES = segment of device driver header
Program: SRDISK is a freeware resizeable RAMdisk by Marko Kohtala
SeeAlso: AX=7200h
--------!---Section--------------------------
Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!
This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.
But one thing that puzzles me is the “mtswslnkmcjklsdlsbdmMICROSOFT” string. There is an article about it here. It is definitely worth a read: http://www.os2museum.com/wp/mtswslnk/