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75 Appx. C
C.4 Interrupt assignments
Table C.4: Interrupt assignments
Interrupt# Interrupt source
IRQ 0 Interval timer
IRQ 1 Keyboard
IRQ 2 Interrupt from controller 2 (cascade)
IRQ 3 COM2
IRQ 4 COM1
IRQ 5 Unused
IRQ 6 FDD
IRQ 7 LPT1
IRQ 8 RTC
IRQ 9 Reserved (audio)
IRQ 10 Unused
IRQ 11 Reserved for watchdog timer
IRQ 12 PS/2 mouse
IRQ 13 INT from co-processor
IRQ 14 Primary IDE
IRQ 15 Secondary IDE for CFC
* Ethernet interface IRQ select: 9, 11, 15
* PNP audio IRQ select: 9, 11, 15
* PNP USB IRQ select: 9, 11, 15
* PNP ACPI IRQ select: 9, 11, 15