IBM PC CONVERTIBLE User Manual

(AH)=5 FORMAT THE DESIRED TRACK
INPUT:
FOR THE FORMAT OPERATION, BUFFER POINTER (ES,BX)
MUST POINT TO COLLECTION OF DESIRED AD DR FIELDS
FOR THE TRACK. EACH FIELD IS COMPOSED OF 4 BYTES,
(C,H,R,N), WHERE C = TRACK NUMBER, H=HEAD NUMBER,
R = SECTOR NUMBER, N= NUMBER OF BYTES PER SECTOR
(00=128, 01=256, 02=512, 03=1024). THERE MUST BE ONE
ENTRY FOR EVERY SECTOR ON THE TRACK. THIS INFORMATION
IS USED TO FIND THE REQUESTED SECTOR DURING READ/WRITE
ACCESS.
REGISTERS FOR READ/WRITE/VERIFY /FORMAT
(DL) - DRIVE NUMBER (0-3 ALLOWED, VALUE CHECKED)
(DH) - HEAD NUMBER (0-1 ALLOWED, NOT VALUE CHECKED)
(CH) - TRACK NUMBER (0-4F, NOT VALUE CHECKED)
(CL) - SECTOR NO. (NOT VALUE CHKD, NOT USED FOR FORMAT)
(AL) - NO. OF SECTORS ( NOT VALUE CHKD, NOT USED FOR FMT) TI
(ES:BX) - ADDRESS OF BUFFER ( NOT REQUIRED FOR VERIFY
DATA VARIABLE -- DISK-POINTER
DOUBLE WORD POINTER TO CURRENT SET OF DSKT PARAMETERS
OUTPUT:
AH = STATUS OF OPERATION
GOOD RETURN OOH
TIME_OUT 80H
BAD_SEEK 40H
BAD_NEe 20H
BAD_CRC 10H
DMA_BOUNDARY 09H
BAD_DMA 08H
MEDIA-CHANGE 06H
RECORD_NOLFND 04H
WRITE_PROTECT 03H
BAD~DDR_MARK 02H
BAD_CMD 01H
NO ERROR DETECTED
ATTACHMENT FAILED TO RESPOND
SEEK OPERATION FAILED
NEC CONTROLLER HAS FAILED
BAD CRC ON DISKETTE READ
ATMPT TO DMA CROSS 64K BNDRY
DMA OVERRUN ON OPERATION
MEDIA HAS BEEN CHANGED
REQUESTED SECTOR NOT FOUND
WRT ATMPTD ON WRT PROT DISK
ADDRESS MARK NOT FOUND
BAD CMD PASSED TO DSKT I/O
AL = NUMBER OF SECTORS ACTUALLY TRANSFERRED
OS, BX,DX,CX PRESERVED
CY = 0 SUCCESSFUL OPERATION (AH=O ON RETURN)
CY = 1 FAILED OPERATION (AH HAS ERROR CODE)
************ ERROR RETRY PROCEDURE *************
NOTE: I F AN ERROR IS REPORTED BY THE DISKETTE CODE, THE
APPROPRIATE ACTION IS TO RESET THE DISKETTE, THEN RETRY
THE OPERATION. MEDIA CHANGE ERRORS NEED NOT BE RETRIED.
ROM BIOS 2-121

IBM PC CONVERTIBLE Specifications

General

Brand	IBM
Model	PC CONVERTIBLE
Category	Laptop
Language	English