IBM XT 5160 Technical Reference page 260

LI NE SOURCE (B I OS FOR THE I BM PERSONAL COMPUTER XT) 1 I /08/82
ABSO
SEGMENT AT 0
STG_LOCO
LABEL
BYTE
ORG 2-4
NMI
-
PTR LABEL WORD
ORG 5-4
INT5_PTR LABEL WORD
ORG
8-4
INT ADDR LABEL WORD
INT:=PTR LABEL
DWORD
ORG 10H-4
V IDEO_INT LABEL WORD
ORG lDH-4
PARM_PTR LABEL DWORD PO I NTER TO V IDEO PARMS
ORG 18H-4
BAS IC_PTR LABEL WORD ENTRY PO I NT FOR CASSETTE BAS I C
ORG
01EH-4
INTERRUPT IEH
DISK_PO INTER LABEL
DWORD
ORG 01FH-4
LOCA T I ON OF PO INTER
EXT_PTR LABEL DWORD PO I NTER TO EXTENS ION
ORG 400H
DATA AREA LABEL BYTE ABSOLUTE LOCA T I ON OF DATA SEGMENT
DATA:=WORD LABEL WORD
ORG 0500H
MFG TEST RTN
LABEL
FAR
- ORG
7COOH
BOOT_LOCN LABEL FAR
ABSO ENDS
.
------------------------------------------------
~
STACK -- USED DURING INITIALIZATION ONLY
5-113
INSERT STATE IS ACTIVE
CAPS LOCK STATE HAS BEEN TOGGLED
NUM LOCK STATE HAS BEEN TOGGLED
SCROLL LOCK STATE HAS BEEN TOGGLED
AL TERNATE SH I FT KEY DEPRESSED
CONTROL SH I FT KEY DEPRESSED
LEFT SH I FT KEY DEPRESSED
RIGHT SH I FT KEY DEPRESSED
ADDRESSES OF RS232 ADAPTERS
ADDRESSES OF PR INTERS
I NST ALLED HARDWARE
I N I TI ALI ZATI ON FLAG
MEMORY SIZE INK BYTES
SCRA TCHPAD FOR MANUFACTUR I NG
ERROR CODES
8259 PORT
8259 PORT
8255 PORT A ADDR
8255 PORT B ADDR
8255 PORT C ADDR
8253 TI MER CONTROL PORT ADDR
8253 TlMER/CNTER 0 PORT ADDR
T I MER 0 I NTR RECVD MASK
DMA STATUS REG PORT ADDR
DMA CH. 0 ADDR. REG PORT ADDR
KEYBOARD DATA IN ADDR PORT
KEYBOARD· I NTR MASK
KEYBOARD SCAN CODE PORT
CONTROL BITS FOR KEYBOARD SENSE DATA
80H
40H
20H
10H
08H
04H
02H
01H
4 DUP(?I
4 DUP(?)
EQU
EQU
EQU
EQU
EQU
EQU
EQU
EQU
DB
WORD
OW
OW
DB
OW
DB
DB
EQUATES
8088 INTERRUPT LOCATIONS
PC-XT System BIOS (11/08/82)
KEYBOARD OAT A AREAS
ROM BIOS DATA AREAS
SEGMENT AT 30H
OW 128 DUP
(?)
LABEL
ENDS
THE B I OS ROUT I NES ARE MEANT TO BE ACCESSED THROUGH
SOFTWARE INTERRUPTS ONLY. ANY ADDRESSES PRESENT IN
THE LIST I NGS ARE INCLUDED ONLY FOR COMPLETENESS.
NOT FOR REFERENCE. APPL I CA T IONS WH I CH REFERENCE
ABSOLUTE ADDRESSES WITH I N THE CODE SEGMENT
V 10LATE THE STRUCTURE AND DES I GN OF B I OS.
;----- SHIFT FLAG EQUATES WITHIN KB_FLAG
INS STATE
CAPS STATE
NUM STATE
SCROLL STATE
ALT SHTFT
CTL-SHIFT
LEFT SHIFT
RIGHT_ SH I FT
STACK
DATA SEGMENT AT 40H
RS232_BASE OW
.
----------------------------------------
PORT A EQU 60H
PORT-B EQU 61 H
PORT-C EQU 62H
CMD PORT EQU 63H
I NTAOO EQU 20H
INTAOI EQU 21H
EOI EQU 20H
T I MER EQU 40H
TIM CTL EQU 43H
T I MERO EQU 40H
TMINT EQU 01
DMA08 EQU 08
DMA EQU 00
MAX PER 100 EQU 540H
MIN-PER 100 EQU 41 OH
KBD-IN EQU 60H
KBDTNT EQU 02
KB DATA EQU 60H
KB:=CTL EQU 61 H
73 TOS
74 STACK
75
76
77
78
79
80
81
82 PR INTER_BASE
1
ST
I TLE (B I OS FOR THE I BM PERSONAL COMPUTER XTl
2
3
4
5
6
7
8
9
10
11
12
13
14
15
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17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
83 EQU I P FLAG
84 MFG TST
85 MEMORY SIZE
86 MFG_ERR_FLAG
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
0080
0040
0020
0010
0008
0004
0002
0001
0060
0061
0062
0063
0020
0021
0020
0040
0043
0040
000 I
0008
0000
0540
0410
0060
OOO?
0060
0061
0000 (128
7777
i···
0000 (4
7777
i···
0008 (4
7777
i···
00 I 0
7777
0012
77
0013
7777
gg:
~
;; ..
LOC OBJECT
0100
0017 ??
0000
0008
0008
0014
0014
0020
0020
0020
0040
0040
0074
0074
0060
0060
0078
0078
007C
007C
0400
0400
0400
0500
0500
7COO
7COO