3Expansion

H/W .

SETUPCards

3. HARDWARE SETUP

The following table lists the default IRQ assignments for standard PC devices. Use this table when configuring your system and for resolving IRQ conflicts.

ISA Interrupt (IRQ) Assignments

ISA INT

Priority

Standard Function

ISA 00

1

System Timer

ISA 01

2

Keyboard Controller

ISA 02

N/A

Programmable Interrupt

ISA 03*

11

Communications Port (COM2)

ISA 04*

12

Communications Port (COM1)

ISA 05*

13

Sound Card (sometimes LPT2)

ISA 06

14

Floppy Disk Controller

ISA 07*

15

Printer Port (LPT1)

ISA 08

3

System CMOS/Real Time Clock

ISA 09*

4

ACPI Mode when used

 

 

 

ISA 10*

5

IRQ Holder for PCI Steering

 

 

 

ISA 11*

6

IRQ Holder for PCI Steering

 

 

 

ISA 12*

7

PS/2 Compatible Mouse Port

ISA 13

8

Numeric Data Processor

ISA 14*

9

Primary IDE Channel

ISA 15*

10

Secondary IDE Channel

*These IRQs are usually available for PCI devices.

PCI Interrupt (IRQ) Assignments

PCI Slot

PCI INTA

PCI INTB

PCI INTC

PCI INTD

1 (64-bit)

PCI 1

PCI 12

PCI 13

PCI 14

2 (64-bit)

PCI 4

PCI 15

PCI 16

PCI 17

3 (64-bit)

PCI 5

PCI 18

PCI 19

PCI 20

4 (64-bit)

PCI 8

PCI 21

PCI 22

PCI 23

5 (32-bit)

PCI 9

PCI 24

PCI 25

PCI 26

6 (32-bit)

PCI 10

PCI 27

PCI 28

PCI 29

22

ASUS TRL-DLS User’s Manual