Asus NCCH-DR 2.5.3Interrupt assignments, 2.5.4PCI/PCI-Xslots, Standard interrupt assignments, IRQ assignments for this motherboard

2.5.3Interrupt assignments

Standard interrupt assignments

I R Q	Priority	Standard Function
0	1	System Timer
1	2	Keyboard Controller
2	—	Re-direct to IRQ#9
3	11	Communications Port (COM2)*
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 IRQs are usually available for ISA or PCI devices.

IRQ assignments for this motherboard

A

B

C

D

E

F

G

H

P X

P X

P X

P X

IRQ1 IRQ2 IRQ3 IRQ4

PCI-X1 slot

—

—

— — — — — —

shared shared shared shared

PCI-X2 slot

—

—

— — — — — —

shared shared shared shared

PCI slot1

—

—

—

—

shared shared shared shared

—

—

—

—

PCI slot2

—

—

—

—

shared shared shared shared

—

—

—

—

PCI slot3

—

—

—

—

shared shared shared shared

—

—

—

—

Onboard USB controller 1

shared

—

— — — — — —

—

—

—

—

Onboard USB controller 2

—

—

—

shared

—

—

—

—

—

—

—

—

Onboard USB 2.0 controller

—

—

—

—

—

—

—

shared

—

—

—

—

Onboard SATA controller

—

—

— — — — — —

— shared

—

—

Onboard LAN2

shared

—

— — — — — —

—

—

—

—

2.5.4PCI/PCI-X slots

The PCI/PCI-X slots support cards such as a LAN card, SCSI card, USB card, and other cards that comply with PCI 2.3 and PCI-X 1.0 specifications. The figure shows a LAN card installed on a PCI slot.

The PCI-X1 slot on SATA models is colored green. When installing a Zero-Channel RAID card, it is recommended that you install it on the PCI-X1 slot for optimum compatibility and performance.

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