IBM 5150 Technical Reference page 159

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EDI, E836
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E016 EBF5
ED18
E018 800E3F0080
EOI0 B04A
EOIF E8A601
EOZZ B440
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E026
ED26 BB0700
E029 E84001
ED2C BB0900
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LINE
SOURCE
2561
STI
; REENABlE THE INTERRUPTS
2562
CAll
CHK_STAT_2 I 00 SENSE INTERRUPT STATUS
2563
; FOLLOWING RESET
2564
HOV
AL,NEt_STATUS I IGNORE ERROR RETURN AND DO OWN TEST
2565
CHP AL,otOH ; TEST FOR DRIVE READY TRANSITION
2566
JZ J7
I EVERYTHING OK
2:567
OR
DISKETTE_STATUS.BAD_NEC I SET ERROR CODE
2566
RET
2569
2570
1----- SEND SPECIFY COMMAND TO NEt
2571
2572
J7:
I
DRIVE_READY
2573 HOV
AH.03H I SPECIFY Cott1Af«)
2574
CALL NEC_OUTPUT
; OUTPUT THE COMI'IAtIJ
2575 HOV
ex.!
; FIRST BYTE PAR" IN BLOCK
2576
CALL GET_PARH
,
TO THE NEe CONTROLLER
2577
MOV BX,]
I SECON) aYTE PARH IN BLOCK
2576
CALL GET_PARM
,
TO THE NEe CONTROLLER
2579
J8:
I RESET_RET
2580
RET I RETURN TO CALLER
2581
DISK..RESET ENDP
2582
2583
;----- DISKETTE STATUS ROUTINE
2584
2585 DISK_STATUS
PROC NEAR
2586 HOV
AL .DISKETTE_STAl1IS
2587 RET
2588 DISK_STATUS
ENDP
2589
2590
;----- DISKETTE READ
2591
2592
DISK.-REAO
PROC NEAR
2593
HOY
AL.046H I READ Cot1t1AND FOR OMA
2594 J9:
I DISK_READ_CONT
2595
CALL DI1A_SETUP
;. SET UP THE DMA
2596 MOV
AH,OE6H
; SET UP RO COt1I1AND FOR NEC COtfTROLLER
2597
JHP
SHORT
R~COF'H
I GO DO THE OPERATION
2598
DISK_READ EtIlP
2599
2600 1----- DISKETTE VERIFY
2601
2602
DISK..VERF PROC NEAR
2603 HOV AL,042H I YERIFY COMHAhI) FOR OMA
2604 JHP
J9 ; DO AS IF DISK READ
2605
DISK..YERF ENDP
2606
2607 ,----- DISKETTE FORMAT
2608
2609 DISK_FORMAT
PROC
NEAR
2610
OR
MOTOR_STATUS,80H I INDICATE WRITE OPERATION
2611
HOY AL,04AH ; WILL WRITE TO THE DISKETTE
2612 CALL
DMA_SETUP I SET UP THE OttA
2613 MOV AH.040H I ESTABLISH THE FORMAT Cott"IAtI)
2614 JMP
SHORT RW_OPN ;. DO THE OPERATION
2615 JIO: I CONTINUATION OF RI,COF'H FOR FttT
2616
HOY
BX.7 I GET THE
2617
CALL GET_PARM
I
BYTES/SECTOR VALUE TO NEC
2618 HOY BX,9
I GET THE
2619 CALL GET_PARM
,
SECTORS/TRACK VALUE TO NEC
2620
HOY
BX,15 ; GET THE
2621
CALL GET_PARH
,
GAP LENGTH VALUE TO NEC
2622 MOV
BX.17 • GET THE FILLER BYTE
2623 JHP
Jl. I
TO THE CONTROLLER
2624 DISK_FORMAT
ENDP
2625
2626 ;----- DISKETTE WRITE ROUTINE
2627
2628
DISK_WRITE
""OC
NEAR
2629 OR HOTOR_STA TUS, BOH J INDICATE WRITE OPERATION
2630 HOY AL,04AH ;. DMA WRITE COMMAND
2631
CALL
DMA_SETUP
2632
MOV
AH,OC5H I NEC CotI1AHD TO WRITE TO DISKETTE
2633 DISK_WRITE
ENDP
2634
2635
1----- ALLOIol WRITE ROUTINE TO FALL INTO RI'COPN
2636
2637
1---------------------------------------------------------------­
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