IBM AT 5170 Technical Reference page 288

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DISK ----- 06/10/85 FIXED DISK 810S
06-10-85
1
PAGE 118.121
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TITLE DISK ----- 06/10/85 FIXED DISK BIOS
3
.286C
.LlST
5 0000
CODE SEGMENT BYTE PUBL I C
•
6
1
PUBLIC 01 SK 10
8
PUBLI C
OJ SK-SETUP
,
PUBLI C
HD_INT
10
11
EXTRN
CMOS READ: NEAR
12
EXTRN
CMOS-WR,ITE:NEAR
13 EXTRN
DDS:NEAR
EXTRN E MSG:NEAR
" EXTRN
FT180:NEAR
15
16
EXTRN
FI18t:NEAR
11 EXTRN
FI782:NEAR
18
EXTRN FI790:NEAR
,.
EXTftN
FI 791 :NE/oR
20
EXTRN FD_TBL:NEAR
21
22 INT 13H --------------------------­
23
2.
FIXED DISK I/O INTERFACE
25
26
THIS INTERFACE PROVIDES ACCESS TO 51/4" FIXED DISKS THROUGH
21
THE IBM FIXED DISK CONTROLLER.
28
2.
THE 810S ROUTI NES ARE MEANT TO BE ACCESSED THROUGH
30
SOFTWARE INTERRUPTS ONLY. ANY ADDRESSES PRESENT IN
31
THESE LISTINGS ARE INCLUDED ONLY FOR' COMPLETENESS.
32
NOT FOR REFERENCE. APPLICATIONS WHICH REFEREf'lCE ANY
33
ABSOLUTE ADDRESSES WITHIN THE CODE SEGMENTS OF BIOS
3.
VIOLATE THE STRUCTURE AND DESIGN OF BIOS.
35
36
31
38
INPUT {AHI:: HEX COMMAND VALUE
3 •
• 0
(AH):: OOH RESET DISK (OL : 80H,81H) / DISKETTE
(AH): 01H READ THE STATUS OF THE LAST DISK OPERATION INTO IAU
"
. 2
NOTE: DL
<
80H - 0 I SKETTE
'3
DL
>
80H - 0 I SK
4.
(AHI: 02H READ THE DESIRED SECTORS INTO MEMORY
.5
.,
IAHI= 03H WRITE THE bESIRED SECTORS FROM MEMORY
.6
I AH 1= 04H VER I FY THE DES I RED SECTORS
(AH) = 05H FORMAT THE DES I RED TRACK
.8
{AH 1= 06H UNUSED
(AHI = 07H UNUSED
50 {AH)::: 08H RETURN THE CURRENT DRIVE PARAMETERS
51 {AHI::: 09H INITlAL.IZE DRIVE PAIR CHARACTERISTICS
52
INTERRUPT 41 PO I NTS TO DATA BLOCK FOR DR I VE
53
INTERRUPT 46 POINTS TO DATA BLOCK FOR DRIVE
54
(AH I::: OAH READ LONG
55
(AHI::: OBH WRITE LONG (READ & WRITE LONG ENCOMPASS 512 + 4 BYTES ECCI
56
(AHI: OCH SEEK
51
IAHI:: ODH ALTERNATE DISK RESET (SEE Dli
58
IAH)::: OEH UNUSED
5.
I AH) = OFH UNUSED
60 IAH)= IOH TEST DRIVE READY
61
IAHI", IIH RECALIBRATE
62 {AHI:: 12H UNUSED
6.
IAHI::: 13H UNUSED
6.
I AH I '" 14H CONTROLLER INTERNAL 0 I AGNOST [C
65 (AHI:: ISH READ DASD TYPE
66
61
6S
6'
REGISTERS USED FOR FIXED DISK OPERATIONS
10
11
(DU DRIVE NUMBER (80H-8IH FOR DISK. VALUE CHECKED I
12
(QH) HEAD NUMBER (0-15 ALLOWED. NOT VALUE CHECKED)
13
ICHI CYLINDER NUMBER (0-1023, NOT VALUE CHECKED I {SEE CU
14
(CL I SECTOR NUMBER ( I-I 7. NOT VALUE CHECKED)
15
16
NOTE: HIGH 2 81TS OF CYLINDER NUMBER ARE PLACED
11
IN THE HIGH 2 81TS OF THE CL REGISTER
18
110 BITS TOTALl
19
80
(All NUMBER OF SECTORS (MAXIMUM POSSIBLE RANGE, 1-80H,
81
FOR READ/WRITE LONG 1-19H)
82
8.
(ES:BX) ADDRESS OF BUFFER FOR READS AND WRITES.
8.
(NOT REQU I RED FOR VER I FY)
85
86
FORMAT IAH=51 ES:BX POINTS TO A 512 BYTE BUFFER. THE FIRST
81
zeISECTORS/TRACKI BYTES CONTAIN F,N FOR EACH SECTOR.
88
F = OOH FOR A GOOD SECTOR
8.
SOH FOR A BAD SECTOR
'0
N
=
SECTOR NUMBER
FOR AN INTERLEAVE OF 2 AND 11 SECTORS/TRACK
"
' 2 THE TABLE SHOULD BE:
,.
93
DB OOH, 0 1 H, OOH, OAH, OOH, 02H, OOH, OBH, OOH, 03H,OOH, OCH
95
DB OOH, 04H, OOH, OOH, OOH, 05H. OOH, OEH, OOH, 06H. OOH. OFH
'6
DB OOH,01H,OOH,IOH,OOH,08H,OOH,IIH,OOH,09H
.,
.8
5-116
DISK