IBM 5150 PC Technical Reference (6025005, August, 1981) (PDF)

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
LABEL
0020
0020
33
3.
O.G
.*.
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
0017 ?? 69 KBJLAG DB
66 ; - -­------­---------------------------------­
67 ; KEYBOARD DATA AREAS
68 ; ---------­-­ - -.----------------------------­
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
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