BIOS Settings 5-5
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A quick review of basic IRQ mapping is given below.
Table 5-1. Basic IRQ Mapping
IRQ #
Description
0
System Counter
1
Keyboard
2
Cascade IRQ
3
COM2
4
COM1
5
Nothing
6
Floppy Disk Controller
7
Printer Port (Parallel Port)
8
CMOS Clock
9
Nothing
10
Nothing
11
Nothing
12
PS/2 mouse
13
Data Processor
14
Primary IDE Controller
15
Secondary IDE Controller
Note:
Onboard PCI devices will occupy resources as assigned
by BIOS or the operating system.
It is very easy to find out which
IRQ resource is ready for additional peripherals. If IRQ resources are
insufficient, disable some of the devices listed above to release
additional resources.