1.9.2Standard Interrupt Assignments

IRQ

Standard Function

0

System Timer

 

 

1

Keyboard Controller

2

Programmable Interrupt Controller

3

Communications Port (COM2)

4

Communications Port (COM1)

5

IRQ Holder for PCI IRQ Steering

6

Standard Floppy Disk Controller

7

ECP Printer Port (LPT1)

8

System CMOS/Real Time Clock

9

IRQ Holder for PCI IRQ Steering

10

IRQ Holder for PCI IRQ Steering

11

IRQ Holder for PCI IRQ Steering

12

PS/2 Compatible Mouse Port

13

Numeric Data Processor

14

Primary IDE controller (dual fifo)

15

Secondary Ultra ATA Controller (dual fifo)

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

IRQ assignments for this motherboard

 

A

B

C

D

 

E

F

G

H

PCI slot 1

—

—

—

—

—

used

—

—

 

PCI slot 2

—

—

—

—

—

—

used

—

 

PCI slot 3

—

—

—

—

—

—

—

shared

 

Onboard USB 1.1 controller 1 shared

—

—

—

—

—

—

—

 

Onboard USB 1.1 controller 2

—

—

—

used

—

—

—

—

 

Onboard USB 1.1 controller 3

—

—

used

—

—

—

—

—

 

Onboard USB 2.0 controller

—

—

—

—

—

—

—

shared

 

Onboard LAN

—

shared

—

—

—

—

—

—

 

Onboard Audio

—

shared

—

—

—

—

—

—

 

Onboard VGA

shared

—

—

—

—

—

—

—

 

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 two PCI groups.

ASUS P4BGL-MX Motherboard

1-9