Acer 510 User Manual

Page 22

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14

System Introductions

DMA Channel Assignment

DMA Channel

Function

DRQ0

Audio(optional)

DRQ1

ECP or Audio(optional)

DRQ2

Floppy

DRQ3

ECP(optional)

DRQ4

DMA controller

DRQ5

Not used

DRQ6

Not used

DRQ7

Not used

I/O Address Map

I/O Address

Function

000-00F

DMA controller-1

020-021

Interrupt controller-1

040-043

Timer 1

060, 064

Keyboard controller 8742 chip select

061

System speaker out

040B DMA

controller-1

061

System speaker

070-071

Real-time clock and NMI mask

080-08F

DMA page register

0A0-0A1

Interrupt controller-2

0C0-0DF

DMA controller-2

0F0-0FF

Numeric data processor

120-13F, 180-18F

Power management controller

170-177

2nd EIDE device (CD-ROM) select

1F0-1F7

1st EIDE device (hard drive) select

220-22F

Audio

240-24F

Audio(optional)

278-27F

Parallel port 3

2E8-2EF

LT Win modem or COM4(optional)

2F8-2FF

COM2 or LT Win modem(optional)

378, 37A

Parallel port 2

3BC-3BE

paraller port 1

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