IBM 5150 Hardware Reference Manual

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

IBM 5150 Specifications

General

Processor	Intel 8088
Clock Speed	4.77 MHz
RAM	16 KB - 256 KB
Manufacturer	IBM
Model	5150
Release Year	1981
Storage	5.25-inch floppy drives
Graphics	MDA or CGA
Operating System	IBM PC DOS
Ports	Cassette, keyboard
Expansion Slots	5