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1-20 Chapter 1: Product introduction
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
IRQ assignments for this motherboard
A B C D E F G H
PCI slot 1 share — — — — — — —
PCI slot 2 — — — share — — — —
PCI slot 3 — — share — — — — —
PCI Express x1 slot 1 share — — — — — — —
PCI Express x1 slot 2 share — — — — — — —
PCI Express x16 slot — — — share — — — —
Onboard USB controller 1 — — — — used — — —
Onboard USB controller 2 — — — — — used — —
Onboard USB controller 3 — — — — — — used —
Onboard USB 2.0 controller — — — — — — — used
Onboard LAN — — — share — — — —
Onboard audio — — share — — — — —
Onboard RAID — used — — — — — —
1.8.3 Interrupt assignments
* 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.