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I/O Address Map
Hex Range
0C0-0DF
0F0
0F1
0F8-0FF
4A0
4A1
0CF8
0CFC
1F0-1F7
278-27F
2F8-2FF
378-37F
3B0-3BF
3C0-3CF
3D0-3DF
3F0-3F7
3F7-3FF
Hex Range
000-01F
020-027
030-037
IRQ Assignment Map
Interrupt Channel
IRQ0
IRQ1
IRQ2
IRQ3
IRQ4
18
DMA Controller-2, 8237
CLEAR Math Co-processor BUSY
RESET Math Co-processor
Math Co-processor
System I/O Port
Bit 3: Onboard VGA Enable/Disable
1: Disable
0: Enable
Bit 0: Onboard LAN 1 Enable/Disable
Bit 1: Onboard LAN 2 Enable/Disable
1: Disable
0: Enable
Bit 2: Onboard SCSI Enable/Disable
1: Enable
0: Disable
Bit [4:7]: Host Frequency Setting
[0, 0, 1, 1]: 1/5, reset only
[0, 1, 1, 1]: 2/11, 300 MHz
[1, 0, 0, 0]: 1/6, 350 MHz
[0, 0, 0, 1]: 1/4, 400 MHz
[0, 1, 0, 1]: 2/9, 450 MHz
[0, 0, 1, 1]: 1/5, 500 MHz
SMISW/SCISW/SOFTNMI
BIOS/Password check control
PCI Configuration Address Reg
PCI Configuration Data Reg
Fixed Hard Disk
Parallel Port 2
Serial Port 2
Parallel Port 1
Monochrome Display
EGA, VGA, SVGA
CGA, VGA, SVGA
Floppy Disk Controller
Serial Port 1
DMA Controller-1, 8237
Interrupt Controller-1 8259
Interrupt Controller-1 8259
Timer output 0
Keyboard
Reserved
Serial Port 2
Serial Port 1
Device Function
Device Function
Function
Chapter 1
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