Standard interrupt assignments

I R Q

Priority

Standard Function

0

1

System Timer

 

 

 

1

2

Keyboard Controller

 

 

 

2

-

Re-direct to IRQ#9

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

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

 

 

 

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

IRQ assignments for this motherboard

 

A

B

C

D

PCI slot 1

—

—

used

—

PCI slot 2

—

—

—

used

PCI slot 3

shared

—

—

—

AGP slot

—

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 A7V400-MX SE

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