User's Manual

1-22 Chapter 1: Product introduction
1.8.3 Interrupt assignments
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 (COM)*
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 PCI-E x1
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, conicts will
arise between the two PCI groups, making the system unstable and the card
inoperable.
IRQ assignments for this motherboard
A B C D
PCI slot 1 — shared — —
PCI slot 2 — — shared —
PCIe x1 slot* Fixed Fixed Fixed Fixed
Onboard USB controller 1 shared — — —
Onboard USB controller 2 — shared — —
Onboard USB controller 3 — — shared —
Onboard USB controller 4 — — — shared
Onboard USB 2.0 controller — — shared —
Onboard LAN shared — — —
Onboard audio — shared — —
Onboard VGA shared — — —