IBM PC CONVERTIBLE Technical Reference page 152

016C DO E4
016E DO E4
0170 80 E4 04
0173 OA E2
0175 E8 022C R
SAL
SAL
AND
OR
CALL
AH,l
AH,l
AH,4
AH,DL
NECOUTPUT
; ----- TEST FOR FORMAT COMMAND
MOVE IT TO BIT 2
ISOLATE THAT BIT
OR IN THE DRIVE NUMBER
0178 80 7E OF 40 CMP
JNE
AHSAVE[BP] ,FORMALCMND ; IS THIS A FORMAT OPERATION
017C 75 20
017E BB 0007
0181 E8 0259 R
0184 E8 022C R
0187 BB 0009
0l8A E8 0259 R
0180 E8 022C R
0190 BB OOOF
0193 E8 0259 R
0196 E8 022C R
0199 BB 0011
019C EB 30
019E
019E 8A 66 OB
01Al E8 022C R
01M 8A 66 01
01A7 E8 022C R
01AA 8A 66 OA
01AD E8 022C R
01BO B8 0007
01 B3 E8 0259 R
01B6 E8 022C R
01B9 BB 0009
01 BC E8 0259 R
01 BF E8 022C R
01C2 BB 'OOOB
01C5 E8 0259 R
01C8 E8 022C R
OlCB BB 0000
OlCE
01CE E8 0259 R
OlD1 E8 022C R
OlD4 58
0105 E8 0373 R
0108
0108 72 49
OlDA E8 03B3 R
0100 72 42
OlDF FC
OlEO BE 0042
01E3 AC
01E4 24 CO
01E6 75 03
01E8 EB 3E 90
OlEB 3C 40
OlED 75 29
J15 ; NO. CONTINUE WITH R/W/V
GET THE DATA FOR A FORMAT OPERATION
MOV
CALL
CALL
MOV
CALL
CALL
MOV
CALL
CALL
MOV
JMP
BX,7
GELPARM
NECOUTPUT
BX,9
GELPARM
NECOUTPUT
BX,15
GELPARM
NECOUTPUT
BX,17
SHORT J16
GET THE
BYTES/SECTOR VALUE TO NEC
GET THE
SECTORS/TRACK VALUE TO NEC
GET THE
GAP LENGTH VALUE TO NEC
GET THE FILLER BYTE
TO THE CONTROLLER
SEND THE DATA FOR A READ/WRITE/VERIFY OPERATION
J15:
MOV
CALL
MOV
CALL
MOV
CALL
MOV
CALL
CALL
MOV
CALL
CALL
MOV
CALL
CALL
MOV
AH,CHSAVE[BP]
NECOUTPUT
AH, DHSAVE [BP]
NECOUTPUT
AH,CLSAVE[BP]
NECOUTPUT
BX,7
GELPARM
NECOUTPUT
BX,9
GELPARM
NECOUTPUT
BX,l1
GELPARM
NECOUTPUT
BX,13
CYLINDER NUMBER (CH SAVE)
HEAD NUMBER FROM STACK
SECTOR NUMBER (CL SAVE)
BYTES/SECTOR PARM FROM BLOCK
TO THE NEC
EOT PARM FROM BLOCK
TO THE NEC
GAP LENGTH PARM FROM BLOCK
TO THE NEC
DTL PARM FROM BLOCK
COMPLETE SETUP TO NEC AND WAIT FOR INTERRUPT
J16:
CALL
CALL
POP
GELPARM
NECOUTPUT
AX
RW_OPN_F I N I SH
TO THE NEC
CAN NOW DISCARD THAT DUMMY
RETURN ADDRESS
LET THE OPERATION HAPPEN
CALL
J17 :
JC
CALL
JC
WAILINT
J21
RESUL TS
J20
WAIT FOR THE INTERRUPT
MOTOR_OFF
LOOK FOR ERROR
GET THE NEC STATUS
LOOK FOR ERROR
CHECK THE RESULTS RETURNED BY THE CONTROLLER
CLD
MOV
LODS
AND
JFZ
JNZ
JMP
CMP
JNZ
; SET THE CORRECT DIRECTION
SI,OFFSET NEC_STATUS ; POINT TO STATUS FIELD
NECSTATUS GET STO
AL,OCOH TEST FOR NORMAL TERMINATION
J22 OPN_OK
$+5 I F NOT ZERO JUMP AROUND JUMP
J22 ELSE TAKE A LONG JUMP
AL,040H TEST FOR ABNORMAL TERMINATION
J18 NOT ABNORMAL, BAD NEC
;----- ABNORMAL TERMINATION, FIND OUT WHY
ROM BIOS 2-127