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User’s Manual
ATX Main board
33
1.6.3 Standard Interrupt Assignments
IRQ Priority Standard Function
0 1 System Timer
1 2 Keyboard Controller
2 - Redirect to IRQ#9
3 11 IRQ holder for PCI streering*
4 12 Communications Port (COM1)*
5 13 IRQ holder for PCI streering*
6 14 Floppy Disk Controller
7 15 Printer Port (LPT)*
8 3 System CMOS/Rear Time
9 4 IRQ holder for PCI streeing*
10 5 IRQ holder for PCI streeing*
11 6 IRQ holder for PCI streeing*
12 7 PS/2 Compatible Mouse Port*
13 8 Numeric Data Processor
14 9 Primary IDE Channel
15 10 Secondary IDE Channel
* There IRQs are usually available for ISA or PCI device.