IBM PC CONVERTIBLE

Common Equates and Data Areas
TITLE COMMON EQUATES/ DATA AREAS
INCLUDE SROMEQUS. INC
; DATE LAST MODIFIED: 09(13(1985
; *******************************************************
; GLOBAL EQUATES FOR I/O PORTS
; *******************************************************
Common Equates
• 0000
0020
0020
OOOB
OOOA
0021
• 0040
•
0042
• 0043
0080
• 0030
0060
• 0061
0061
0080
• 0040
= 0020
• 0008
• 0004
0002
•
0001
D MAC 0 N T R 0 L L E R P 0 R T 00-
DMA
EQU
o
; DMA CONTROLLER BASE ADDRESS
I N T ERR U P T CON T R 0 L L E R - 20,21H
INTAOO EQU
EOI EQU
READ_ISR EQU
READ_IRR EQU
INTA01 EQU
SYSTEM TIMERS
TIMERO
TIMER2
EQU
EQU
TIMEILCTL EQU
TIMER2JTL EQU
TLATCH EQU
20H
20H
OBH
OAH
21H
- 40,42,43H
40H
42H
43H
80H
30H
INTERRUPT CONTROLLER PORT 1
NON SPECI FIC END OF INTERRUPT
READ IN SERV REG AT INTAOO
READ INT REQ REG AT INTAOO
IRPT CONTROLLER MASK REG
TIMER 0 COUNTER PORT AD DR
TIMER 2 COUNTER PORT AD DR
TIMER 0,2 CONTROL PORT ADDR
ACCESS TIMER2 CONTROLS
LATCH TMR VAL R/W LEAST, 1ST
KEY BOA R D S CAN COD E P 0 R T - 60H
EQU
60H ; MAIN KEYBOARD SCAN CODE PORT
N M I CON T R 0 L P 0 R T - 61H
NMLCNTL
EQU
61H NMI CONTROL PORT
KB_CTL
EQU
61H PORT 60H CONTROL REGISTER
CLR_KEYBD
EQU
80H CLEAR KEYBOARD SIGNAL
DIS_COPROC
EQU
40H DISABLE COPROCESSOR NMI
DIS_IOCHK
EQU
20H DISABLE I/O CHANNEL CHECK NMI
DISJ.LARM
EQU
08H DISABLE RTC ALARM NMI
EN_SPKR
EQU
04H ENABLE SPEAKER (NOT AN NMI)
SPKR_DATA
EQU
02H SPEAKER DATA LINE (NOT AN NMI)
TMRLGATE
EQU
01H GATE TIMER 2 (NOT AN NMI)
ROM BIOS 2-7