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1.7.3
Interrupt assignments
Standard interrupt assignments
IRQ
Priority
0
1
2
4
5
6
7
8
9
10
11
12
13
14
15
* These IRQs are usually available for ISA or PCI devices.
1-1
Standard function
1
System Timer
Keyboard Controller
2
–
Redirect to IRQ#9
12
Communications Port (COM1)*
13
IRQ Holder for PCI Steering*
14
Floppy Disk Controller
15
Printer Port (LPT1)*
3
System CMOS/Real Time Clock
4
IRQ Holder for PCI Steering*
5
IRQ Holder for PCI Steering*
6
IRQ Holder for PCI Steering*
7
PS/2 Compatible Mouse Port*
8
Numeric Data Processor
9
Primary IDE Channel
10
Secondary IDE Channel
Chapter 1: Product introduction
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