IBM Personal System/2 65 SX User Manual

System-Board I/O Address Map
Figure 1-2 shows the address map for the various system-board I/O
functions.
Address (Hex) Device
0000 - 001F DMA Controller (0—3)
0020, 0021 Interrupt Controller (Master)
0040, 0042 - 0044, 0047
0060 Keyboard, Auxiliary-Device
0061 System-Control Port B
0064 Keyboard, Auxiliary-Device
0070, 0071 RT/CMOS and NMI Mask
074 - 076 2KB CMOS RAM extension
0081 - 0083, 0087
0089 - 008B, 008F
0090
0091 Card-Selected Feedback Register
0092 System-Control Port A
0094 System-Board Enable/Setup Register
0096 Adapter Enable/Setup Register
OOAO, O0A1 Interrupt Controller (Slave)
00CO - OODF DMA Controller (4-7)
OOFO - OOFF Math Coprocessor
0100 - 0107 Programmable Option Select
0278 - 027B Parallel Port 3
02F8 - 0O2FF Serial Port 2 (RS-232C)
0378 - 037B Parallel Port 2
03B4, 03B5, 03BA Video Subsystem
O3BC - O3BF Parallel Port 1
03C0 - 03C5 Video Subsystem
03C6 - 03C9 Video DAC
O3CE, 03CF Video Subsystem
03D4, 03D5, 03DA Video Subsystem
03F0 - 03F7 Diskette-Drive Controlier
O3F8 - O3FF Serial Port 1 (RS-232C)
System Timers
DMA Page Registers (0-3)
DMA Page Registers (4 — 7)
Central Arbitration Control Point
Figure 1-2. System-Board I/O Address Map
Model 65 System Overview — October 1990 1-5

IBM Personal System/2 65 SX Specifications

General

Brand	IBM
Model	Personal System/2 65 SX
Category	Desktop
Language	English