Category : Assembly Language Source Code
Archive   : DSKPATCH.ZIP
Filename : DSKPATCH.ASM

;---------------------------------------------------------------------;
; DSKPATCH.ASM MAIN PROGRAM, CALLS ALL REQUIRED PROCEDURES ;
; CV*04-30-89 ;
; ;
; Compiled with: DISK_IO, DISP_SEC, VIDEO_IO, CURSOR, DISPATCH ;
; KBD_IO, PHANTOM, EDITOR ;
;---------------------------------------------------------------------;

CGROUP GROUP CODE_SEG, DATA_SEG
ASSUME CS:CGROUP, DS:CGROUP

CODE_SEG SEGMENT PUBLIC
ORG 100h

EXTRN CLEAR_SCREEN:NEAR, READ_SECTOR:NEAR
EXTRN INIT_SEC_DISP:NEAR, WRITE_HEADER:NEAR
EXTRN WRITE_PROMPT_LINE:NEAR, DISPATCHER:NEAR
DISK_PATCH PROC NEAR
CALL CLEAR_SCREEN
CALL WRITE_HEADER
CALL READ_SECTOR
CALL INIT_SEC_DISP
LEA DX,EDITOR_PROMPT
CALL WRITE_PROMPT_LINE
CALL DISPATCHER
INT 20h
DISK_PATCH ENDP

CODE_SEG ENDS


DATA_SEG SEGMENT PUBLIC

PUBLIC SECTOR_OFFSET
;---------------------------------------------------------------------;
; SECTOR_OFFSET is the offset of the half sector display into the ;
; full sector. It must be a multiple of 16, and not greater than 256 ;
;---------------------------------------------------------------------;
SECTOR_OFFSET DW 0

PUBLIC CURRENT_SECTOR_NO, DISK_DRIVE_NO, HEADER_COLOR
PUBLIC PROMPT_LINE_COLOR, SEC_DISP_COLOR, PHANTOM_COLOR
PUBLIC COLOR
CURRENT_SECTOR_NO DW 0 ;Initially sector 0
DISK_DRIVE_NO DB 0 ;Initially drive A:
PROMPT_LINE_COLOR DB 70h ;Prompt color
HEADER_COLOR DB 4Fh ;Header color
SEC_DISP_COLOR DB 1Fh ;Sector display color
PHANTOM_COLOR DB 2Ch ;Phantom cursor color
COLOR DB 1Fh ;Color variable used in WRITE_CHAR

PUBLIC HEADER_PART_1, HEADER_PART_2, HEADER_PART_3
PUBLIC LINES_BEFORE_SECTOR, HEADER_LINE_NO
;---------------------------------------------------------------------;
; LINES_BEFORE_SECTOR is the number of lines at the top of the screen ;
; before the half sector display. ;
;---------------------------------------------------------------------;
LINES_BEFORE_SECTOR DB 2
HEADER_LINE_NO DB 0
HEADER_PART_1 DB 'Disk ',0
HEADER_PART_2 DB ' SECTOR ',0
HEADER_PART_3 DB ' FLOPPY DISK EDITOR',0
PUBLIC PROMPT_LINE_NO, EDITOR_PROMPT
PROMPT_LINE_NO DB 21
EDITOR_PROMPT DB ' F1=Pre-sec F2=nex-sec F3=+sec F4=-sec '
DB ' ShiftF5=write F6=A: F7=B: F8=D: '
DB ' '
DB ' '
DB ' '
DB 'Press function key, or enter'
DB ' character or hex byte: ',0


PUBLIC SECTOR
;---------------------------------------------------------------------;
; The entire sector (up to 8192 bytes) is stored in this ;
; part of memory ;
;---------------------------------------------------------------------;
SECTOR DB 1024 DUP (0)

DATA_SEG ENDS

END DISK_PATCH