User Guide
159
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Interrupt Requests
The factory-set interrupt requests (IRQs) are listed below. Find an appropriate one to
install an optional device.
* These IRQs are usually available for ISA or PCI devices
Caution
When using PCI cards on shared slots, ensure that the drivers
support “Share IRQ” or that the cards do not need IRQ assign-
ments.
Otherwise, conflicts will arise between the two PCI groups,
making the system unstable and the card inoperable.
Table 12: Interrupt Requests
IRQ
Priority
Standard Function
0
1
System Timer
1
2
Keyboard Controller
2
-
Re-direct 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
14
IRQ holder for PCI steering*
10
5
IRQ holder for PCI steering*
11
6
IRQ holder for PCI steering*
12
7
P/S2 Compatible Mouse Port
13
8
Numeric Data Processor
14
9
Primary IDE Channel
15
10
Secondary IDE Channel
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