Compaq PC X1000 User Manual

Specifications

Maintenance and Service Guide

6–13

Table 6-13

System Interrupts

Hardware
IRQ

System
Function

IRQ0

System timer

IRQ1

Keyboard controller

IRQ2

Cascaded

IRQ3

COM2

IRQ4

COM1

IRQ5

Audio (default)*

IRQ6

Diskette drive

IRQ7

Parallel port

IRQ8

Real time clock (RTC)

IRQ9

Infrared

IRQ10

System use

IRQ11

System use

IRQ12

Internal pointing stick or external mouse

IRQ13

Coprocessor (not available to any peripheral)

IRQ14

IDE interface (hard drive and optical drive)

IRQ15

System use

✎

PC Cards may assert IRQ3, IRQ4, IRQ5, IRQ7, IRQ9, IRQ10,
IRQ11, or IRQ15. Either the infrared or the serial port may
assert IRQ3 or IRQ4.

*Default configuration; audio possible configurations are IRQ5, IRQ7, IRQ9,
IRQ10, or none.

325388-002.book Page 13 Friday, October 24, 2003 9:21 AM