Asus P5RD1-VM 1.8.3Interrupt assignments, Standard interrupt assignments, IRQ assignments for this motherboard

1.8.3Interrupt assignments

Standard interrupt assignments

I R Q Standard Function

0System Timer

1Keyboard Controller

2Re-direct to IRQ#9

4Communications Port (COM1)*

5IRQ holder for PCI steering*

6Floppy Disk Controller

7Printer Port (LPT1)*

8System CMOS/Real Time Clock

9IRQ holder for PCI steering*

10IRQ holder for PCI steering*

11IRQ holder for PCI steering*

12PS/2 Compatible Mouse Port*

13Numeric Data Processor

14Primary IDE Channel

15Secondary IDE Channel

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

IRQ assignments for this motherboard

	A	B	C	D	E	F	G	H
PCI slot 1	shared	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ
PCI slot 2	Ñ	shared	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ
PCI Express x16 slot	shared	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ
PCI Express x1 slot	Ñ	shared	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ
Onboard USB controller 1	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ	shared
Onboard USB controller 2	Ñ	Ñ	Ñ	shared	Ñ	Ñ	Ñ	Ñ
Onboard USB controller 3	Ñ	Ñ	shared	Ñ	Ñ	Ñ	Ñ	Ñ
Onboard USB controller 4	Ñ	Ñ	Ñ	shared	Ñ	Ñ	Ñ	Ñ
Onboard USB 2.0 controller	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ	shared
Onboard IDE port	Ñ	Ñ	Ñ	shared	Ñ	Ñ	Ñ	Ñ
Onboard HD audio	shared	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ
Onboard LAN	Ñ	shared	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ

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.

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