I/O Address Map

Hex Range

Devices

 

 

000-01F

DMA Controller-1

020-021

Interrupt Controller-1

040-043

System Timer

060-060

Keyboard Controller 8742

061-061

System Speaker

070-071

CMOS RAM Address and Real Time Clock

080-08F

DMA Page Register

0A0-0A1

Interrupt Controller-2

0C0-0DF

DMA Controller-2

0F0-0FF

Math Co-Processor

170-177

Secondary IDE

1F0-1F7

Primary IDE

278-27F

Parallel Printer Port 2

2F8-2FF

Serial Asynchronous Port 2

378-37F

Parallel Printer Port 1

3F0-3F5

Floppy Disk Controller

3F6-3F6

Secondary IDE

3F7-3F7

Primary IDE

3F8-3FF

Serial Asynchronous Port 1

0CF8

Configuration Address Register

0CFC

Configuration Data Register

778-77A

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

 

 

 

NOTE: N - Not be used

18

Chapter 1

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Image 26
Acer power sx/sxb/sc manual Address Map, IRQ Assignment Map, Hex Range Devices, IRQx System Devices Add-On-Card Devices