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Chapter 1 15
NOTE: N - Not be used
I/O Address Map
Hex Range Devices
000-00F
020-021
040-043
060-060
061-061
070-071
080-08F
0A0-0A1
0C0-0DF
0F0-0FF
170-177
1F0-1F7
278-27F
2F8-2FF
378-37F
3F0-3F5
3F6-3F6
3F7-3F7
3F8-3FF
0CF8
0CFC
778-77A
DMA Controller-1
Interrupt Controller-1
System Timer
Keyboard Controller 8742
System Speaker
CMOS RAM Address and Real Time Clock
DMA Page Register
Interrupt Controller-2
DMA Controller-2
Math Co-Processor
Secondary IDE
Primary IDE
Parallel Printer Port 2
Serial Asynchronous Port 2
Parallel Printer Port 1
Floppy Disk Controller
Secondary IDE
Primary IDE
Serial Asynchronous Port 1
Configuration Address Register
Configuration Data Register
Parallel Printer Port 1
IRQ Assignment Map
IRQx System Devices Add-On-Card Devices
IRQ0 Timer N
IRQ1 Keyboard N
IRQ2 Cascade Interrupt Control N
IRQ3 Serial Alternate Reserved
IRQ4 Serial Primary Reserved
IRQ5 MPU-401(Alternate) Reserved
IRQ6 Floppy Disk Reserved
IRQ7 Parallel Port Reserved
IRQ8 Real Time Clock N
IRQ9 N Reserved
IRQ10 N Reserved
IRQ11 N Reserved
IRQ12 PS/2 Mouse Reserved
IRQ13 Math Coprocessor Exception N
IRQ14 Primary IDE Reserved
IRQ15 Secondary IDE Reserved