Specifications

 

Table 6-13

 

System Interrupts

Hardware

System

IRQ

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.

Maintenance and Service Guide

6–13

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HP X1140EA, X1027AP, X1026AP, X1023AP, X1020EA, X1018CL, X1012EA, X1012QV, X1015US, X1010EA, X1010AL, X1010CA System Interrupts, Irq

X1079AP, X1083AP, X1097AP, X1215AP, X1040AP specifications

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