Standard Interrupt Assignments
IRQPriorityStandard Function

0

1

System Timer

1

2

Keyboard Controller

2

N/A

N/A

3

11

IRQ Holder for PCI Steering

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

Microsoft ACPI-Compliant System

10

5

IRQ Holder for PCI Steering

11

6

IRQ Holder for PCI Steering

12

7

PS/2 Compatible Mouse Port

13

8

Numeric Data Processor

14

9

Primary IDE Channel

15

10

Secondary IDE Channel

IRQ assignments for this motherboard

 

INT A

INT B

INT C

INT D

PCI slot 1

shared

––

––

––

PCI slot 2

––

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 the two PCI groups, making the system unstable and the card inoperable.

ASUS P5V-VM Ultra Motherboard

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