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1-22 Chapter 1: Product introduction
1.8.3 Interrupt assignments
* These IRQs are usually available for ISA or PCI devices.
IRQ assignments for this motherboard
A B C D E F G H
PCI Express x16 slot 1 — — — — shared — — —
PCI Express x16 slot 2 — — — — — — used —
PCI Express x1 slot 1 — — — — shared — — —
PCI Express x1 slot 2 — — — — — used — —
PCI Express x1 slot 3 — — — — — — — used
PCI slot 1 shared — — — — — — —
PCI slot 2 — shared — — — — — —
Onboard USB1.0 controller 1 shared — — — — — — —
Onboard USB1.0 controller 2 — shared — — — — — —
Onboard USB2.0 controller — — shared — — — — —
Onboard LAN — — shared — — — — —
Onboard IDE controller — — — — shared — — —
Onboard SATA controller shared — — — — — — —
Onboard Audio controller shared — — — — — — —
Standard interrupt assignments
IRQ Priority Standard Function
0 1 System Timer
1 2 Keyboard Controller
2 — Re-direct to IRQ#9
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