IBM XT 5160 Technical Reference page 199

IBM Personal Computer MACRO Assembler Version 2.00
KEYBRD ---
01/10/86
KEYBOARD ADAPTER BIOS
1-7
01-10-86
PAGE
;------ NOT IN HOLD STATE
AL, AH
=
SCAN CODE (ALL MAKES)
0200
K28: NO-HOLD-STATE
0200 3C 58
CMP
AL,88 TEST FOR OUT-OF-RANGE SCAN CODES
02DF 77 E9
..JA K26
IGNORE IF OUT-OF-RANGE
02El F6 C3 08
TEST BL , AL T_ SH I FT ARE WE I N AL TERNA TE SH I FT?
02E4 74 OC
..JZ K28A ..JUMP I F NOT AL TERNA TE
02E6 F6 C7 10
TEST BH,KBX
IS TH I S THE ENHANCED KEYBOARD?
02E9 74 OA
..JZ K29
NO, ALT STATE I S REAL
02EB F6 06 0018 R 04
TEST "KB_FLAG_"SYS_SHIFT YES,
IS SYSREQ KEY DOWN?
02FO 74 03
..JZ K29 NO, ALT STATE IS REAL
02F2 E9 03CC R
K28A: ..JMP K38
YES, THIS I S PHONY AL T STATE
DUE TO PRESS I NG SYSREQ
;------ LOOK FOR TOP ROW OF ALTERNATE SHIFT
; ------ TRANSLATE ALTERNATE SH I FT PSEUDO SCAN CODES
; ------ TEST FOR RESET KEY SEQUENCE (CTL AL T DELl
10 NUMBERS ON KEYPAD
A-Z TYPEWR I TER CHARS
AL T-TOP-ROW
KEY WITH '1' ON I T
NOT ONE OF INTERESTING KEYS
I SIT I N THE REG I ON
AL T-FUNCT I ON
CONVERT PSEUDO SCAN CODE TO RANGE
GO FILL THE BUFFER
AL T-KEY-PAD
AL T-I NPUT-TABLE
LOOK FOR ENTRY US I NG KEYPAD
LOOK FOR MATCH
NO AL T KEYPAD
I S-THIS ONE OF THE NEW KEYS?
YES, ..JUMP, NOT NUMPAD KEY
01 NOW HAS ENTRY VALUE
GET THE CURRENT BYTE
MUL
TI PL Y BY 10
ADD IN THE LATEST ENTRY
STORE IT AWAY
THROW AWAY THAT KEYSTROKE
NO-ALT-KEYPAD
ZERO ANY PREV I OUS ENTRY I NTO INPUT
DI,ES ALREADY POINTING
LOOK FOR MATCH I N ALPHABET
MATCH FOUND, GO FILL THE BUFFER
TEST-RESET
, ARE WE I N CONTROL SH I FT ALSO?
; NO RESET
; SHIFT STATE I S THERE, TEST KEY
; NO_RESET, IGNORE
AL,2
K37B
AL,13
K35
AH,118
SHORT K37A
"AL T INPUT, 0
CX,26
SCASB
K37A
01 ,OFFSET K30
CX, 10
SCASB
K33
BH,LC EO
K37C -
01 ,OFFSET K30+1
AL,"ALT INPUT
AH,IO -
AH
AX,DI
"ALT INPUT, AL
K26 -
BL,CTL SHIFT
K31 -
AL,DEL KEY
K31 -
MOV
MOV
REPNE
..JE
MOV
MOV
REPNE
..JNE
TEST
..JNZ
SUB
MOV
MOV
MUL
ADD
MOV
..JMP
CMP
..JB
CMP
..JA
ADD
..JMP
TEST
..JZ
CMP
..JNE
K31 :
CMP
AL,57
..JNE K311
MOV AL,
..JMP K57
K311 :
CMP AL,15
..JNE
K312
MOV
AX,OA500h
..JMP K57
K312:
CMP AL,74
..JE K37B
CMP
AL,78
..JE K37B
; ------ IN ALTERNATE SH I FT, RESET NOT FOUND
NO-RESET
TEST FOR SPACE KEY
NOT THERE
SET SPACE CHAR
BUFFER_F I LL
TEST FOR TAB KEY
NOT THERE
SET SPEC I AL CODE FOR AL T-TAB
BUFFER_F I LL
TEST FOR KEYPAD -
GO PROCESS
TEST FOR KEYPAD +
GO PROCESS
K35:
AL T-FUNCT I ON
CMP
AL,F"_M IS IT Fll?
..JB K35A
NO, BRANCH
CMP AL,FI2_M
IS IT F12?
..JA K35A
NO, BRANCH
ADD AH,52
CONVERT TO PSEUDO SCAN CODE
..JMP SHORT K37A
GO FILL THE BUFFER
K35A: TEST BH,LC_EO
DO WE HAVE ONE OF THE NEW KEYS?
..JZ K37
NO, ..JUMP
CMP AL,28
TEST FOR KEYPAD ENTER
..JNE K35B
NOT THERE
MOV
AX,OA600h SPEC I AL CODE
..JMP K57
BUFFER FILL
K35B: CMP AL,83
TEST FOR DELETE KEY
..JE K37C
HANDLE WITH OTHER ED I T KEYS
; ------ LOOK FOR SUPERSH I FT ENTRY
K33:
K32A:
K34:
; ------ CTL-AL T-DEL HAS BEEN FOUND, DO 1/0 CLEANUP
MOV "RESET FLAG, 1234H SET FLAG FOR RESET FUNCT I ON
AND WORD PTR "KB FLAG 3, KBX , CLEAR ALL FLAG BI TS EXCEPT KBX
..JMP RESET - - ; ..JUMP TO POWER ON 0 I AGNOST I CS
; ------ AL T-INPUT-TABLE
K30 LABEL BYTE
DB 82, 79, 80 , 8 1 , 75
DB 76 , 77 , 7 1 , 72 , 73
; ------ SUPER-SH 1FT-TABLE
DB 16, 17,18,19,20,21
DB 22,23,24,25,30,31
DB 32,33,34,35,36,37
DB 38,44,45,46,47,48
DB 49,50
; ------ LOOK FOR KEY PAD ENTRY
K32:
K29:
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560 02F5
561 02F5 F6 C3 04
562 02F8 74 37
563 02FA 3C 53
564 02FC 75 33
565
566
567
568 02FE C7 06 0072 R 1234
569 0304 81 26 0096 R 0010
570 030A E9 0000 E
571
572
573 0300
574 0300 52 4F 50 51 4B
575 0312 4C 40 47 48 49
576
577 031710 11 12 13 14 15
578 0310 16 17 18 19 IE IF
579 0323 20 21 22 23 24 25
580 0329 26 2C 20 2E 2F 30
581 032F 3 I 32
582
583
584
585 0331
586 0331 3C 39
587 0333 75 05
588 0335 BO 20
589 0337 E9 0500 R
590 033A
591 033A 3C OF
592 033C 75 06
593 033E B8 A500
594 0341 E9 0500 R
595 0344
596 0344 3C 4A
597 0346 74 79
598 0348 3C 4E
599 034A 74 75
600
601
602
603 034C
604 034C BF 0300 R
605 034F B9 OOOA
606 0352 F21 AE
607 0354 75 18
608 0356 F6 C7 02
609 0359 75 6B
610 035B 81 EF 030E R
61 1 035F AO 0019 R
612 0362 B4 OA
613 0364 F6 E4
614 0366 03 C7
615 0368 A2 0019 R
616 036B E9 02CA R
617
618
619
620 036E
621 036E C6 06 0019 R 00
622 0373 B9 001 A
623 0376 F21 AE
624 0378 74 42
625
626
627
628 037A
629 037A 3C 02
630 037C 72 43
631 037E 3C 00
632 0380 77 05
633 0382 80 C4 76
634 0385 EB 35
635
636
637
638 0387
639 0387 3C 57
640 0389 72 09
641 038B 3C 58
642 0380 77 05
643 038F 80 C4 34
644 0392 EB 28
645
646 0394 F6 C7 02
647 0397 74 18
648 0399 3C 1C
649 039B 75 06
650 0390 B8 A600
651 03AO E9 0500 R
652 03A3 3C 53
653 03A5 74 1F
5-52 KEYBOARD (01/10/86)