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APPENDIX
44
IB895 User’s Manual
Appendix
A. I/O Port Address Map
Each peripheral device in the system is assigned a set of I/O port
addresses which also becomes the identity of the device. The following
table lists the I/O port addresses used.
Address
Device Description
0000-001F
Direct memory access controller
0000-001F PCI
bus
0020-0021
Programmable interrupt controller
0024-0025
Programmable interrupt controller
0028-0029
Programmable interrupt controller
002C-002D
Programmable interrupt controller
0030-0031
Programmable interrupt controller
0034-0035
Programmable interrupt controller
0038-0039
Programmable interrupt controller
003C-003D
Programmable interrupt controller
0040-0043 System
timer
0050-0053 System
timer
0060-0060
Standard PS/2 Keyboard
0064-0064
Standard PS/2 Keyboard
0070-0077
System CMOS/real time clock
0081-0091
Direct memory access controller
0093-009F
Direct memory access controller
00A0-00A1
Programmable interrupt controller
00A4-00A5
Programmable interrupt controller
00A8-00A9
Programmable interrupt controller
00AC-00AD
Programmable interrupt controller
00B0-00B1
Programmable interrupt controller
00B4-00B5
Programmable interrupt controller
00B8-00B9
Programmable interrupt controller
00BC-00BD
Programmable interrupt controller
00C0-00DF
Direct memory access controller
00F0-00F0
Numeric data processor
02E8-02EF
Communications Port (COM4)
02F8-02FF
Communications Port (COM2)