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1 standard interrupt assignments, 2 irq assignments for this motherboard – Asus P4R800-VM User Manual

Page 23

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ASUS P4R800-VM motherboard user guide

1-13

1.8.1 Standard interrupt assignments

IRQ

Priority

Standard Function

0

1

System Timer

1

2

Keyboard Controller

2

N/A

Programmable Interrupt

3*

11

Communications Port (COM2)

4*

12

Communications Port (COM1)

5*

13

IRQ holder for PCI steering

6

14

Floppy Disk Controller

7*

15

Printer Port (LPT1)

8

3

System CMOS/Real Time Clock

9*

4

IRQ holder for PCI steering

10*

5

Advance AC’97 CODEC

11*

6

Standard PCI Graphics Adapter (VGA)

12*

7

PS/2 Compatible Mouse Port

13

8

Numeric Data Processor

14*

9

Primary IDE Channel

15*

10

Secondary IDE Channel

*

These IRQs are usually available for ISA or PCI devices.

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.

1.8.2 IRQ assignments for this motherboard

A

B

C

D

PCI slot 1

shared

PCI slot 2

shared

PCI slot 3

shared

AGP slot

shared

Onboard USB controller 1

shared

Onboard USB controller 2

shared

Onboard USB controller 3

shared

Onboard USB 2.0 controller

shared

Onboard LAN

shared

Onboard audio

used