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ASUS P4U800-X motherboard
1-11
1.8.1 Standard interrupt assignments
IRQ Priority Standard Function
0 1 System Timer
1 2 Keyboard Controller
2 N/A Programmable Interrupt
3* 11 IRQ holder for PCI steering
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.
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.
1.8.2 IRQ assignments for this motherboard
ABCDEFGH
PCI slot 1 — shared — — — — — —
PCI slot 2 — — shared — — — — —
PCI slot 3 — — — shared — — — —
PCI slot 4 — — — — shared — — —
PCI slot 5 — — — — — shared — —
AGP slot used — — — — — — —
Onboard USB controller 0 — — shared — — — — —
Onboard USB controller 1 — — shared — — — — —
Onboard USB controller 2 — — shared — — — — —
Onboard LAN — — — shared — — — —
Onboard Audio — — — — — shared — —
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.