IBM PC CONVERTIBLE Technical Reference page 150

00A4 J6:
00A4 DC 08 OR AL, FDCDMA.-ENAB TURN ON INTERRUPT ENABLE
00A6 EE OUT DX,AL RESET THE ADAPTER
00A7 C6 06 003E R 00 MOV SEEICSTATUS,O SET RECAL REQUIRED ON ALL DRIVES
OOAC C6 06 0041 R 00 MOV
DISKETTE_STATUS,O
SET OK STATUS FOR DISKETTE
OOBI DC 04 OR AL, FDCRUN TURN OFF RESET
00B3 EE OUT DX,AL TURN OFF THE RESET
00B4 E8 0373 CALL WAILINT WAIT FOR INTERRUPT
00B7 72 3C JC J8 IF NO INTERRUPT THEN EXIT
00B9 B8 00F5 R MOV AX,OFFSET J8 SET ERROR RETURN ADDRESS FOR NECOUT
OOBC 50 PUSH AX
OOBD
B9 0004 MOV CX,4 READ RESET STATUS FOR ALL 4 DRIVES
oDeD STALLOOP:
OOCO B4 08 MOV AH, READ_INLSTATUS SENSE INTERRUPT STATUS
00C2 E8 022C R
CALL NECOUTPUT
COMMAND TO NEC
00C5 E8 03B3 R
CALL RESULTS
GET THE RESULTS
00C8 AO 0042 R MOV AL, NECSTATUS IGNORE ERROR RETURN AND DO OWN TEST
OOCB
24 F8
AND AL,OF8H IGNORE DRIVE SPECIFIER
OOCD 3C CO
CMP AL ,OCOH
TEST FOR DRIVE READY TRANSITION
OOCF
El EF LOOPZ STALLOOP
IF OKAY GET NEXT DRIVE READY INFO
0001 DB C9
OR cX,ex
ALL BYTES PICKED UP?
0003 74 08
JZ J7
I F SO THEN OKAY
NEC ERROR: ALL 4 DRIVE STATUSES NOT CORRECT AFTER RESET
0005
58 POP AX
; DISCARD ERROR ADDRESS ON STACK
0006
80 OE 0041 R 20 OR
DISKETTE_STATUS,BAD_NEC ; SET ERROR CODE
OODB
EB 18 JMP SHORT J8 ; EXIT
SEND SPECI FY COMMAND TO NEC
0000
J7: DRIVE_READY
0000
B4 03 MOV
AH,SPECIFY SPECI FY COMMAND
OODF
E8 022C CALL NECOUTPUT
OUTPUT THE COMMAND
00E2 BB 0001 MOV BX,l FIRST BYTE PARM IN BLOCK
00E5 E8 0259 R
CALL
GELPARM TO THE NEC CONTROLLER
00E8 E8 022C R
CALL NECOUTPUT
OOEB BB 0003 MOV BX,3 SECOND BYTE PARM IN BLOCK
OOEE
E8 0259 R CALL GELPARM TO THE NEC CONTROLLER
OOF! E8 022C R CALL NECOUTPUT
00F4 58 POP AX DISCARD ERROR RETURN ADDRESS
00F5
J8: RESELRET
00F5 C3
RET
RETURN TO CALLER
00F6 DISICRESET ENDP
***********************************************************
----- DISKETTE STATUS ROUTINE
***********************************************************
00F6
DISICSTATUS PROC NEAR
00F6 AD 0041 R MOV AL, 01 SKETTE_STATUS
00F9 88 46 DE
MOV
ALSAVE[BP] ,AL MOVE STATUS IN AL SAVE AREA
OOFC C3 RET
OOFD DISICSTATUS ENDP
; ***********************************************************
;----- DISKETTE READ
; ***********************************************************
OOFD DISICREAD PROC NEAR
OOFD E8 050B R
CALL DSKLCHANGE CHECK FOR MEDIA CHANGE
0100 72 IF
JC DSKLERR
0102
BO 46 MOV
AL,DMA_READ
READ COMMAND FOR DMA
0104 E8 02Fl
CALL
DMA_SETUP
SET UP THE DMA
0107 72 18 JC DSKLERR ; JUMP I F ERROR
0109 C6 46 OF E6
MOV
AHSAVE[BP] ,READ_CMND ; RD COMMAND (AH SAVE)
0100 EB 41
JMP
SHORT RW_OPN
; GO DO THE OPERATION
010F DISICREAD
ENDP
; ***********************************************************
DISKETTE VERI FY
ROM BIOS 2-125