Specifications

ASUS P4RD1-MX 1-15

1.8.3 Interrupt assignments

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

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.

IRQ assignments for this motherboard

A B C D E F G H

PCI slot 1 — shared — — — — — —

PCI slot 2 — — shared — — — — —

PCIe x1 slot — shared — — — — — —

PCIe x16 slot — — shared — — — — —

Onboard USB controller 1 — shared — — — — — —

Onboard USB controller 2 — — shared — — — — —

Onboard USB controller 3 — — — used — — — —

Onboard USB 2.0 controller — — — — — — — used

Onboard SATA — — — — — used — —

Onboard LAN — — — — used — — —

Onboard HD audio — — — — — — used —

Onboard VGA — shared — — — — — —

Standard interrupt assignments

IRQ Priority Standard Function

0 1 System Timer

1 2 Keyboard Controller

2 • Re-direct to IRQ#9

3 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