IBM 5150 Hardware Reference Manual page 195

lOC OBJ LINE SOURCE
STITlE( ROM BIOS FOR IBM PERSONAL COMPUTER)
;
-----------------------­
; EQUATES
;
----
--------------------­
0060
PORT_A EQU 60H i 8255 PORT A ADDR
0061 PORT_B EQU
61H
j
8255 PORT B ADDR
0062
PORT.C EQU 62H ;8255 PORT C ADDR
0063 CMO]ORT EQU 63H
0020
9 INTAOO EQU
20H
;8259 PORT
0021
10 INTAOl EQU
21H ;8259 PORT
0020
11 EOI EQU 20H
0040
12 TIMER EQU
'OK
0043
13 TIM.tTl EQU
'3H
;8253 TINER CONTROL PORT ADDR
0040
14 TINERO EQU
'OH ;8253 TIMER/CNTER
a
PORT ADDR
0001 15 THIHT EQU
01
ITIHER
a
INTR RECVD MASK
0008 16 OMAoa EQU 06 ;oNA STATUS REG PORT ADDR
0000 17
DHA EQU 00
JDMA CHANNEL
a
ADDRESS REG PORT ADoR
0540
18 MAX.PERIOD EQU 540H
0410
I.
MIN.PERIOD EQU 410H
0060
20
KBD.IN EQU
60H IKEYBDARD DATA IN AOOR PORT
0002
21
KBDINT EQU
02
;KEYBOARD INTR I1A.SK
0060 22
KB.DATA EQU 60H ; KEYBOARD SCAN CODE PORT
0061 23
24
KB.CTL EQU
61H ; CONTROL BITS FOR KEYBOARD SENSE DATA
1-------------------------------------------­
25
j
8088
INTERRUPT LOCATIONS
26 ; ------------­ ----------­ ------------­ -------­
0000
27
ABSO SEGMENT AT 0
0000
2.
LABEL BYTE
0008
2.
ORG
2*'
0008 30 LABEL WORD
0014 31 ORG
5*'
0014
0020
0020
33
3.
O.G
LABEL .*.
LABEL
WORD
WORD
0020 35
LABEl DWORD
0040 36
O.G 10H*4
0040 37 LABEl WORD
0074
38
ORG
IDH*4
0074
39 LABEL DWORD
I
POINTER TO VIDEO PARHS
0078
.0
ORG 01EH*4 I INTERRUPT IEH
0078
.1
OISK]OINTER LABEl DWORD
D07C
.2
DRG 01 FH*4 ; LOCATION OF POINTER
DO?C 43 EXT_PTR LABEL DWORD I POINTER TO EXTENSION
7COO
••
ORG 7COOH
7COO
.s
BOOT_LOCN LABEl FAR
46 ABSO ENDS
47
48
j--------------------­
49 ; STACK -­ USED DURING INITIALIZATION ONLY
50 ;---------------------­
51 STACK SEGHEUT AT 30H
0000 (128
????
I
52 DW
128 DUPf?)
0100 53
TOS
LABEl WORD
54 STACK ENOS
55
56 ; ------------------­ ------------------------­
57
; RON BIOS DATA AREAS
58
j - - - ­ - - ­ - ­ - - - ­ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ­
0040 59 DATA SEGHENT AT 40H
0000 (4
????)
60 RS232_BASE OW 4 DUPf?) ; ADDRESSES OF RS232 ADAPTERS
0008 (4 !???)
61 PRWTER_BASE
DW
4 DUP(?
I
; ADDRESSES OF PRINTERS
0010
????
62 EQUIPJLAG DW ; nlSTALLED HARDWARE
0012
??
63 MFG_TST
DB
; INITIALIZATION FLAG
0013
????
64 MEMeRY.SIZE
DW
; MEMORY SIZE IN K BYTES
0015
????
65 IO.RAM_SIZE DW ; MEMORY IN I/O CHANNEL
66 ; - -­ ------­ ---------------------------------­
67 ; KEYBOARD DATA AREAS
68 ; ---------­ -­ - -.----------------------------­
0017 ??
69 KBJLAG DB
70
71 ;-----. SHIFT flAG EQUATES WITHIN KB_FlAG
72
0080
73 INS_STATE EQU
80K
; INSERT STATE IS ACTIVE
0040
7.
CAPS_STATE EQU 40H
j
CAPS LOCK STATE HAS BEEN TOGGLED
0020 75
HUJ'CSTATE EQU
20K
j
HUM LOCK STATE HAS BEEN TOGGLED
0010
76 SCROLL_STATE
EQU 10H
; SCROll LOCK STATE HAS BEEN TOGGLED
0008 77
All_SHIFT EQU 08H i
ALTERNATE SHIfT KEY DEPRESSED
A-2