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2-12 Chapter 2: Basic installation
* 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,
conicts will arise between the two PCI groups, making the system
unstable and the card inoperable.
Standard interrupt assignments
IRQ Priority Standard Function
0 1 System Timer
1 2 Keyboard Controller
2 – Re-direct to IRQ#9
3 11 IRQ holder for PCI steering*
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
PCI slot 1 used — — —
PCI slot 2 — used — —