APPENDIX A: Server Specifications

Interrupts

Important

If you disable an IDE controller to free the interrupt for that controller, you must physically unplug the IDE cable from the system board. Simply disabling the drive by configuring the BIOS option does not make the interrupt available.

The following table reflects a typical configuration, but you can change these interrupts. Use this information to determine how to program each interrupt.

ISA Interrupt

Description

 

 

IRQ0

8254 timer

 

 

IRQ1

Keyboard controller

 

 

IRQ2

Cascade for IRQ9

 

 

IRQ3

Free

 

 

IRQ4

Serial port

 

 

IRQ5

Hot-plug SCSI controller

 

 

IRQ6

Diskette controller

 

 

IRQ7

Free

 

 

IRQ8

Real-time clock

 

 

IRQ9

Generic, Option for SCI

 

 

IRQ10

VGA

 

 

IRQ11

USB

 

 

IRQ12

Mouse controller

 

 

IRQ13

Numeric data processor

 

 

IRQ14

Primary IDE controller

 

 

IRQ15

Secondary IDE controller

 

 

Connector pinouts

Main power connector (J8)

Pin

Signal Name

 

 

1+3.3 V

2+3.3 V

3Ground

4+5 V

5Ground

6+5 V

7Ground

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