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Chapter 2: Basic installation
When using a PCI card 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.
Standard interrupt assignments
IRQ Standard Function
0 System Timer
1 Keyboard Controller
2 Programmable Interrupt
4 Communications Port (COM1)
6 Floppy Disk Controller
7* Printer Port (LPT1)
8 System CMOS/Real Time Clock
9* ACPI Mode when used
10* IRQ Holder for PCI Steering
11* IRQ Holder for PCI Steering
12* PS/2 Compatible Mouse Port
13 Numeric Data Processor
14* Primary IDE Channel
* These IRQs are usually available for ISA or PCI devices.
A B C D E F G H
PCI slot –– –– –– –– –– shared –– ––
PCI Express x16 slot 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 IDE port –– –– shared –– –– –– –– ––
Onboard ACʼ 97 Audio shared –– –– –– –– –– –– ––
Onboard LAN –– shared –– –– –– –– –– ––
Onboard 1394 –– –– –– –– –– shared –– ––
IRQ assignments for this motherboard