User Guide

2-14 Chapter 2: Hardware Information
IRQ assignments for this motherboard
A B C D E F G H
PCI slot 1 used — — — — — — —
PCI slot 2 — used — — — — — —
PCI slot 3 — — used — — — — —
PCI E x 16 slot (max. 4X mode) — — — — — — — shared
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 ACʼ97 audio — — — — — — used —
2.5.3 Interrupt assignments
Standard interrupt assignments
IRQ Priority Standard Function
0 1 System Timer
1 2 Keyboard Controller
2 • Re-direct to IRQ#9
3 11 Communications Port (COM2)*
4 12 IRQ holder for PCI steering*
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.
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.