2-20 Chapter 2: Hardware information
2.5.3 Interrupt assignments
Standard interrupt assignments
* These IRQs are usually available for ISA or PCI devices.
IRQ Priority Standard function
0 1 System Timer
1 2 Keyboard Controller
2 – Redirect 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
IRQ assignments for this motherboard
A B C D E F G H
PCI slot 1 – shared – – – – – –
PCI slot 2 – – shared – – – – –
Onboard 1394 shared – – – – – – –
PCIE x16_1 shared – – – – – – –
PCIE x16_2 – – – – – shared – –
PCIE x 4 – – – – – – shared –
PCIE x 1 – – – – shared – – –
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