1.8.3Interrupt assignments

Standard interrupt assignments

I R Q

Standard Function

 

0

System Timer

 

1

Keyboard Controller

 

2

Programmable Interrupt

 

4*

Communications Port (COM1)

 

5*

Sound Card (sometimes LPT2)

 

6

Floppy Disk Controller

 

 

 

 

7*

Printer Port (LPT1)

 

 

 

 

8

System CMOS/Real Time Clock

 

9*

ACPI Mode when used

 

10*

IRQ holder for PCI Steering

 

 

 

 

12*

PS/2 Compatible Mouse Port

 

 

 

 

13

Numeric Data Processor

 

 

 

 

14*

Primary IDE Channel

 

 

 

 

15*

Secondary IDE Channel

 

 

 

 

* These IRQs are usually available for ISA or PCI devices.

IRQ assignments for this motherboard

 

 

A

B

C

D

 

 

AGP slot

used

—

—

—

 

 

PCI slot 1

—

used

—

—

 

 

PCI slot 2

—

—

used

—

 

When using PCI cards on shared slots, ensure that the drivers support “Share IRQ” or that the cards do not need IRQ assignments; otherwise, conflicts will arise between the two PCI groups, making the system unstable and the card inoperable.

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Chapter 1: Product introduction