IBM AT 5170 Technical Reference page 291

IBM Personal Computer MACRO Allilembler VersIon 2.00
1-'
DISK -----
06/10/85
nXEO DISK BIOS
06-10-aS
270 PAGE
271
1------------- - - ------- -------------------------------------- -- ­
272
; FIXED DISK 110 SETUP
273
274
! -
ESTABl I SH TRANSFER VECTORS FOR THE FI XED 01 SK
275
1 - PERFORM POWER ON DIAGNOSTICS
27'
; SHOULD AN ERROR OCCUR A
~1701~
MESSAGE IS DISPLAYED
277
•
278 I - - - - - -- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ---- - - - - - - - - - - - - - - - - - - - - ­
279
ASSUME CS:CODE,DSIABSO I WORK OFF OS REGISTER
280
281
0000
DISK SETUP
PROC NEAR
282 0000 FA
- ClI
283
000 I 88 ~--- R
MOV AX,ABSO GET ABSOLUTE SEGMENT
28. 0004 8E 08 MOV
DS,AX
SET SEGMENT REG) STER
285 0006 A I 004C R MOV
AX, WORD PTR OORG VECTOR GET 0 I SKETTE VECTOR
28. 0009 A3 0100 R
MOV
WORD PTR 4!ODISK VECTOR,AX INTO INT 40H
287
OOOC A I 004E R
MOV
288 OOOF A3 0102 R MOV
:~R~O~~RP!~
I
;~ReE~~g~~~: ~X
28'
0012 C7 06 004C R 0lA9 R MOV WORD PTR IIORG VECTOR, OFFSET 0 I SK 10 F (XED 0 I SK HANDLER
2'0
0018 8C OE 004E R
MOV
WORD PTR OORG-VECTOR+2,CS
2"
OOIC C7 06 0108 R 06CD R
MOV WORD PTR OHDISK INT ,OFFSET HD INT FIXED DISK INTERRUPT
2'2
0022 ac OE 01DA R
MOV
WORD PTR OHDISK-INT+2,CS ­
2.3 0026 C7 06 0104 R 0000 E
MOV
WORD PTR OHF TBe VEC, OFFSET FD TBl PARM TABLE DR I VE
eo
2 •• 002C 8C OE 0106 R
MOV
WORD PTR OHF-TBl-VEC+2,CS ­
2 •• 0030 C7 06 0118 R 0000 E
MOV WORD PTR OHFT TBC VEC,OFFSET FD TBl PARM TABLE DRIVE 8]
2"
0036 8C OE 011A R
MOV
WORD PTR OHFI-TBL-VEC+2,CS ­
2.7 003A E4 AI IN
Al.INTBOl - - ; TURN ON SECOND INTERRUPT CHIP
2.8 003C 24 8F ANa
AL,OBFH
299 003E E8 00
JMP
300 0040 EEl AI
OUT INTBOI,Al
"2
30 I 0042 E4 21 IN
Al,INTAOI LET
I
NTERRUPTS PASS THRU TO
302 0044 24 FB
ANa Al.OFBH SECOND CHIP
303 0046 EB 00
JMP
30'
0048 E6 21
OUT INTA01,Al
"2
305
30.
004A FB
STI
307
ASSUME DS:DATA,ES:ABSO
308 0048 IE
PUSH
as
MOVE ABSO PO I NTER TO
309
004C 01
POP
ES EXTRA SEGMENT PO INTER
310 0040 E8 0000 E CALL 005 ESTABLISH DATA SEGMENT
311 0050 C6 06 0074 R 00
MOV ODISK STATUS I
,a
RESET THE STATUS INDICATOR
312 0055 C6 06 0075 R 00
MOV
OHF NOM,O ZERO NUMBER OF F I XED 0 [ SK S
313 005A CEI 06 0076
R
00 MOV OCONTROL BYTE,
a
31'
005F BO 8E MOV
Al.CMOS DIAG+NMI
315 0061 E8 0000 E
CAll CMOS READ CHECK CMOS VALIDITY
31'
0064 8A EO
MOV AH,AC
SAVE CMOS FLAG
317 0066 24 CO ANa AL.BAD BAT+BAD CKSUM CHECK FOR VAL 10 CMOS
318 0066 74 03
JZ
LI ­ -
319 006A E9 00F8 R
JMP POD_DONE
I CMOS NOT VALID -- NO FIXED DISKS
320 0060 1I:
321 0060 80 E4 F7 ANa
AH,NOT HF FAIL
ALLOW Fl XED 01 SK IPL
322 0070 80 8E MOV AL.CMOS DTAG+NMI WRITE IT BACK
323 0012 E8 0000 E
CALL CMOS WRITE
32. 0075 80 92
~OV Al.CMOS DISK+NMI
325 0077 E8 0000 E CALL
CMOS READ
32'
007A C6 06 0077 R 00
OOV IIPORT OFF.O ZERO CARD OFFSET
327 007F 8A Da
OOv Bl,AL- SAVE F I XED DISK BYTE
328 0061 25 OOFO
ANa AX,OOOFOH
GET FIRST DRIVE TYPE AS OFFSET
32. 0064
74 72
JZ POD_DONE NO FIXED DISKS
330
331 00a6 3C FO
COP AL.OFOH
CHECK FOR EXTENDED DR I VE TYPE BYTE USE
332 0088 75 10 JNE L2 USE DRIVE TYPE I --> 14 IF NOT IN USE
333
33'
ooaA 80 99
OOv AL.CMOS DISK I+NMI GET EXTENDED TYPE FOR DR I VE C:
335 ooac E8 0000 E CALL CMOS READ - FROM CMOS
33. OOaF 3C 00
COP
Al,O-
I S TYPE SET TO ZERO
337 0091
74
65
JE POD DONE EXIT IF NOT VALID AND NO FIXED DISKS
338 0093 3C 2F
eMP Al.47
IS TYPE WITHIN VALID RANGE
339 0095 77 61
JA
POD_DONE
EXIT WITH NO FIXED DISKS IF NOT VALID
3.0
0097 CI EO 04
SHL AX.4 ADJUST TYPE TO HIGH NIBBLE
3.,
009A L2.
3'2
009A 05 FFFO E AOO
AX. OFFSET FD TBl -
]00
COMPUTE OFFSET OF FIRST DRIVE TABLE
3'3
0090 26: A3 0104 R OOV WORD PTR OHF-TBl VEC. AX
SAVE IN VECTOR POINTER
3 •• OOAI C6 06 0075 R 01
OOV
OHF NUM,] - -
AT LEAST ONE DR
I
VE
3.5 00A6 8A C3
MOV Al.Bl
3 •• 00A8 CO EO 04 SHL Al,4 ; GET SECOND DR I VE TYPE
3.7 OOAB 14 2A
JZ SHORT l4 , ONLY ONE DRIVE
3'8
OOAD B4 00
MOV AH,O
3.9
350 OOAF 3C FO
eMP Al,OFOH CHECK FOR EXTENDED DR I VE TYPE BYTE USE
351 OOBI 75 10 JNE
L3
USE DRIVE TYPE I
-->
14 IF NOT IN USE
352
353 00B3 BO 9A
MOV
Al,CMOS DISK 2+NMI GET EXTENDED TYPE FOR DR I VE
0:
35'
00B5 E8 0000 E
CAll CMOS REAO FROM CMOS
355 00B8 3C 00
eMP
Al,O-
I S TYPE SET TO ZERO
35. OOBA 74 IB
JE SKIP IF SECOND FIXED DISK NOT VALID
L'
357
OOBC 3C 2F
eMP Al,47
IS TYPE WITHIN VALID RANGE
L'
358 OOBE 77 17
JA SKIP IF NOT VALID
359 OOCO Cl EO 04
SHL AX,4
AD..JUST TYPE TO HIGH NIBBLE
3.0 00C3 l3:
3.,
00C3
05
FFFO E
ADD
AX, OFFSET FD TBl - [60 COMPUTE OFFSET FOR SECOND F I XED 0 I SK
3.2 00C6 8B 08 MOV
BX ,AX ­
3.3
ooce
2E: 83 3F 00
eMP WORD PTR CS: [BX) ,0 CHECK FOR ZERO CYLINDERS IN TABLE
3 •• OOCC 14 09
JE
SKIP DRIVE IF NOT A VALID TABLE ENTRY
L'
3.5 OOCE 26: A3 0118 R
"OV
WORD PTR OHFI TBl VEC,AX
3 •• 0002 C6 06 0075 R 02
MOV
OHF_NUM.2 - - TWO DR I YES
3.7 0007
L',
3.8 0007 82 80
MOV Dl.80H CHECK THE 'CONTROllER
3 •• 0009 84 14 OOV
AH,14H
USE CONTROllER 0 I AGNOST I C COMMAND
370 OODB CD 13 INT
13H
CAll BIOS WITH DIAGNOSTIC COMMAND
371 0000 72 lA
.JC CTl ERR X DI SPLAY ERROR MESSAGE IF BAD RETURN
372 OODF A I a06C
R
OOV AX,
'iTi
MER lOW GET START TIMER COUNTS
373 00E2 88 08 OOV BX, AX ­
374 00E4 05 0444
AOO AX.o-182 60 SECONDS· 18.2
375 00E7 88 C8 MOV
CX,AX
37. 00E9 E8 0 I 04 R
CAll HD RESET ]
SET UP DR I VE 0
377
OOEC 80 3E 0075 R 01
COP
4!OHF NUM. T WERE THERE TWO DRIVES?
378 OOFI 76 05
JBE
POD-DONE NO-ALL DONE
37. 00F3 B2 81
MOV DL.8IH
SET UP DR I VE I
380 OOFS Ea 0104 R CALL HD_RESET_I
381
OOFe
POD DONEz
382 00F8 C3 - RET
383
DISK
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