Standard i nterrupt assi gnments

IRQ

Priority

Standard Function

0

1

System Timer

 

1

2

Keyboard Controller

 

2

–

Re-direct to IRQ#9

 

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

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 I RQs are usually available for ISA or PCI devices.

I RQ assi gnments for thi s motherboard

 

A

B

C

D

PCI slot 1

used

—

—

—

PCI slot 2

—

used

—

—

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.

2-12

Chapter 2: Basic installation