A-6
IBM Personal Computer User Guide
System interrupts
This table shows the system Interrupt Requests (IRQs) and their functions. You may
use this information if you install an adapter card that requires you to set IRQs. An
IRQ function that has a device name in parenthesis
might
not be available on all
models. In some cases, the device listed uses the IRQ.
Table 4: System interrupts
Interrupt
request (IRQ)
Function
0
Timer
1
Keyboard
2
Programmable Interrupt Controller
3
Serial Port, Communications port (COM2)
4
Sis 7001 PCI to USB open host controller
5
Modem/Audio
6
Diskette
7
Parallel, Printer port
8
Real Time Clock/System CMOS
9
ACPI SCI
10
Audio
11
Ethernet, LAN
12
PS/2 Mouse
13
Numeric Data Processor
14
Primary IDE
15
Secondary IDE
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