Expansion Slots; Standard Interrupt Assignments; Irq Assignments For This Motherboard - Asus P4U800-X User Manual

1.8

Expansion slots

To install and configure an expansion card:
1. Install an expansion card following the instructions that came with the chassis.
2. Turn on the system and change the necessary BIOS settings, if any. See
Chapter 2 for BIOS information.
3. Assign an IRQ to the card. Refer to the tables next page.
4. Install the drivers and/or software applications for the expansion card
according to the card documentation.

1.8.1 Standard interrupt assignments

IRQ
0
1
2
3*
4*
5*
6
7*
8
9*
10*
11*
12*
13
14*
15*
*
These IRQs are usually available for ISA or PCI devices.

1.8.2 IRQ assignments for this motherboard

PCI slot 1
PCI slot 2
PCI slot 3
PCI slot 4
PCI slot 5
AGP slot
Onboard USB controller 0
Onboard USB controller 1
Onboard USB controller 2
Onboard LAN
Onboard Audio
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.
ASUS P4U800-X motherboard
Priority
1
2
N/A
11
12
13
14
15
3
4
5
6
7
8
9
10
A B
— shared
— —
— —
— —
— —
used —
— —
— —
— —
— —
— —
Standard Function
System Timer
Keyboard Controller
Programmable Interrupt
IRQ holder for PCI steering
Communications Port (COM1)
IRQ holder for PCI steering
Floppy Disk Controller
Printer Port (LPT1)
System CMOS/Real Time Clock
IRQ holder for PCI steering
IRQ holder for PCI steering
IRQ holder for PCI steering
PS/2 Compatible Mouse Port
Numeric Data Processor
Primary IDE Channel
Secondary IDE Channel
C D E
— — —
shared — —
— shared —
— — shared
— — —
— — —
shared — —
shared — —
shared — —
— shared —
— — —
F G H
— — —
— — —
— — —
— — —
shared — —
— — —
— — —
— — —
— — —
— — —
shared — —
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