Acer 505 User Manual

Page 32

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Chapter 1

IRQ Assignment Map

Interrupt Channel

Function

NMI

System errors

IRQ0

System timer

IRQ1

Keyboard

IRQ2

Cascade

IRQ3

COM2

IRQ4

COM1

IRQ5

VGA

IRQ6

Floppy

IRQ7

LPT1

IRQ8

Real time clock

IRQ9

PCMCIA (Optional)

IRQ10

USB

IRQ11

Audio/Modem/CardBus

IRQ12

PS2 pointing device

IRQ13

Numeric data processor

IRQ14

1st IDE device (hard disk)

2nd EIDE device (CD-ROM drive)

IRQ15

Optional

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

505-1.book Page 26 Thursday, November 4, 1999 4:36 PM