IRQ usage

The following table lists the Interrupt Request Lines (IRQs) that the system typically uses and which ones are available for use by add-on devices.

IRQ

Resource

 

 

NMI

 

 

 

0

System timer

 

 

1

Keyboard

 

 

2

Cascade

 

 

3

Serial port 2 (COM2)

 

 

4

Serial port 1 (COM1)

 

 

5

Secondary parallel port (LPT2)

 

 

6

Diskette controller

 

 

7

Primary parallel port (LPT1)

 

 

8

Real time clock (RTC)

 

 

9

Cascade redirect

 

 

10

Available

 

 

11

Available

 

 

12

PS/2 mouse port

 

 

13

Math coprocessor

 

 

14

Primary hard disk

 

 

15

Secondary hard disk

 

 

112 Maintaining and Troubleshooting the Gateway ALR 7300 Server