Commodore Amiga A500 - Page 131

DISKDSR ENTRY POINT
RESET DISK SUBSYSTEM (AH = OOH)
VIA SIW INT 13H
OUTPUT: AH = DlSK STATUS
READ DlSK STATUS (AH = 01 H)
OUTPUT: AH
& AL = DlSK STATUS
READ SECTOR(S) (AH = 02H)
WRITE SECTOR(S) (AH = 03H)
VERIFY SECTOR(S) (AH = 04H)
INPUT: DL
=DRlVENUMBER(O-3)
DH = HEAD NUMBER (0-1)
CH
= TRACK NUMBER (0-39)
CL
= SECTOR NUMBER (1 -8)
AL
= NUMBER OF SECTORS TO READ, WRITE OR
VERIFY (1 -8)
ES:BX = BUFFER ADDRESS
OUTPUT: AH
= DlSK STATUS
AL
=O
FORMAT TRACK (AH = 05H)
INPUT: DL
= DRIVE NUMBER (0-3)
DH
= HEAD NUMBER (0-1)
CH
= TRACK NUMBER (0-39)
AL
= # of sectors to format to see if we have a DMA
boundary error
ES:BX = BUFFER ADDRESS 4-BYTE TRACK INFO
FIELDS (C,H,R,N):
C
= TRACK NUMBER
H
= HEAD NUMBER
R
= SECTOR NUMBER
N
= BWESISECTOR (00 = 128,01= 256,
10=512,11= 1024)
OUTPUT: AH
= DlSK STATUS
DlSK STATUS RETURNED IN AH (IF CF = 1)
01 H
- Illegal Command
02H - Address Mark not Found
03H
- Write Protect Error
04H
- Sector not found
06H
- No Diskette
08H
- DMA Overrun
09H - DMA Boundary Violation
1 OH - CRC Error
20H - FDC Error
40H
- Seek Error
80H
- Timeout