5.6.2Standard Interrupt Assignments

IRQ

Standard Function

0

System Timer

 

 

1

Keyboard Controller

2

Programmable Interrupt Controller

3*

USB Universal Host Controller

4*

Communications Port (COM1)

5*

Onboard Audio

6

Standard Floppy Disk Controller

7*

Printer Port (LPT1)

8

System CMOS/Real Time Clock

9*

Onboard LAN

10*

USB Universal Host Controller

11*

Onboard VGA

12*

PS/2 Compatible Mouse Port

13

Numeric Data Processor

14*

Ultra ATA Controller

15*

Secondary Ultra ATA Controller

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

IRQ assignments for this motherboard

 

A

B

C

D

PCI slot 1

—

shared

—

—

PCI slot 2

—

—

shared

—

Onboard USB controller HC0

—

—

—

shared

Onboard USB controller HC1

—

—

—

shared

Onboard LAN

—

—

shared

—

Onboard Audio

—

—

shared

—

Onboard VGA

shared

—

—

—

5-8

Chapter 5: Motherboard Information