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28 ASUS P4T User’s Manual

3. HARDWARE SETUP

Expansion Cards

3. H/W SETUP

3.7.2 Assigning IRQs for Expansion Cards

Some expansion cards need an IRQ to operate. Generally, an IRQ must be exclu-

sively assigned to one use. In a standard design, there are 16 IRQs available but

most of them are already in use, leaving 6 IRQs free for expansion cards. If your

motherboard has PCI audio onboard, an additional IRQ will be used. If your moth-

erboard also has MIDI enabled, another IRQ will be used, leaving 4 IRQs free.

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 Sound Card (sometimes LPT2)

6 14 Floppy Disk Controller

7* 15 Printer Port (LPT1)

8 3 System CMOS/Real Time Clock

9* 4 ACPI Mode when enabled

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.

Interrupt Request Table for this Motherboard

INT-A INT-B INT-C INT-D

PCI slot 1 ——shared —

PCI slot 2 shared ———

PCI slot 3 — shared ——

PCI slot 4 ——shared —

PCI slot 5 ———shared

AGP slot shared ———

Onboard USB controller ———shared

SMBus — shared ——

IMPORTANT: If using PCI cards on shared slots, make sure that the drivers

support “Share IRQ” or that the cards do not need IRQ assignments. Conflicts will

arise between the two PCI groups that will make the system unstable or cards

inoperable.

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