2-18 Chapter 2: Hardware information
2.5.3 Interrupt assignments
IRQ Priority Standard Function
0 1 System Timer
1 2 Keyboard Controller
2 — Re-direct to IRQ#9
3 11 —
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.
A B C D E F G H
PCI slot 1 — shared — — — — — —
PCI slot 2 — — — — — shared — —
PCI slot 3 — — — — — — shared —
PCI E x16 slot shared — — — — — — —
PCI E x1 slot 1 shared — — — — — — —
PCI E x1 slot 2 — shared — — — — — —
Onboard USB controller 0 shared — — — — — — —
Onboard USB controller 1 — shared — — — — — —
Onboard USB controller 2 — — shared — — — — —
Onboard USB controller 3 — — — shared — — — —
Onboard EHCI controller shared — — — — — — —
Onboard IDE port — — — — — — shared —
Onboard SATA port — — — — — — — shared
Onboard Audio controller — — — shared — — — —
Onboard LAN controller — — shared — — — — —
Onboard 1394 controller — — — — — — — shared
Onboard SATA controller — — — shared — — — —
Standard interrupt assignments
IRQ assignments for this motherboard