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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
0Timer
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
9ACPI SCI
10 Audio
11 Ethernet, LAN
12 PS/2 Mouse
13 Numeric Data Processor
14 Primary IDE
15 Secondary IDE