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Appendix B. I/O Address Map
•
I/O Address Map
I/O Address
Map
Description
000-01F
DMA Controller #1
020-021
Interrupt Controller # 1, Master
040-05F System
Timer
060-06F
Standard 101/102 keyboard Controller
070-07F
Real time Clock, NMI Controller
080-0BF
DMA Page Register
0A0-0BF
Interrupt Controller # 2
0C0-0DF
DMA Controller # 2
0F0-0F0
Clear Math Coprocessor Busy
0F1-0F1
Reset Math Coprocessor
0F8-OFF Math
Coprocessor
170-1F7
BUS Master PCI IDE Controller
278-27F
Parallel Printer Port 2
2F8-2FF
Serial Port 2
294-297 PCI
bus
376-376
BUS Master PCI IDE Controller
378-37F
Parallel Printer Port 1
3B0-3DF
Standard AGP Graphic Adapter
3F0-3F7
Floppy Disk Controller
3F8-3FF
Serial Port 1
443
Watch dog timer enable
843/043
Watch dog timer disable
38
1
st MB Memory Address Map
Memory address
Description
00000-9FFFF
SYSTEM MEMORY
A0000-BFFFF
VGA BUFFER
C0000-C7FFF
VGA BIOS
C8000-CFFFF
NO USE
D6000-D7FFF
DEFAULT DOC2000 ADDRESS
E0000-FFFFF
SYSTEM BIOS
100000
EXTEND MEMORY
IRQ Mapping Chart
IRQ0 System Timer
IRQ8 RTC clock
IRQ1 Keyboard
IRQ9 SCSI PORT A
IRQ2 IRQ Controller
IRQ10 LAN
IRQ3 COM2
IRQ11 IDE RAID
IRQ4 COM1
IRQ12 PS/2 mouse
IRQ5 LAN IRQ13 FPU
IRQ6 FDC IRQ14 Primary
IDE
IRQ7 Printer IRQ15 Secondary
IDE
DMA Channel Assignment
Channel
Function
0
Available
1
Available
2
Floppy
disk
3
Available
4
Cascade for DMA controller 1
5
Available
6
Available
7
Available