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CD1.mdf
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dskpat17.asm
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Assembly Source File
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1989-05-16
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1KB
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60 lines
DOSSEG
.MODEL SMALL
.STACK
.DATA
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
CURRENT_SECTOR_NO DW 0 ;Initially sector 0
DISK_DRIVE_NO DB 0 ;Initially Drive A:
PUBLIC LINES_BEFORE_SECTOR, HEADER_LINE_NO
PUBLIC HEADER_PART_1, HEADER_PART_2
;-----------------------------------------------;
; 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
.DATA?
PUBLIC SECTOR
;-----------------------------------------------;
; The entire sector (up to 8192 bytes) is ;
; stored in this part of memory. ;
;-----------------------------------------------;
SECTOR DB 8192 DUP (?)
.CODE
EXTRN CLEAR_SCREEN:PROC, READ_SECTOR:PROC
EXTRN INIT_SEC_DISP:PROC, WRITE_HEADER:PROC
DISK_PATCH PROC
MOV AX,DGROUP ;Put data segment into AX
MOV DS,AX ;Set DS to point to data
CALL CLEAR_SCREEN
CALL WRITE_HEADER
CALL READ_SECTOR
CALL INIT_SEC_DISP
MOV AH,4Ch ;Return to DOS
INT 21h
DISK_PATCH ENDP
END DISK_PATCH