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1-12
Chapter 1: Product introduction
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 Advance AC’97 CODEC
11* 6 Standard PCI Graphics Adapter (VGA)
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 — — — — — — —
AGP slot shared — — — — — — —
Onboard USB controller shared — shared shared — — — used
Onboard LAN — shared — — — — — —
Onboard Audio — shared — — — — — —