Common IRQ Assignments
Terms
undefined, object
copy deck
- 0
- System Clock(timing pulse)
- 1
- Keyboard
- 2
- Gateway (cascade) to IRQs 8-15
- 3
- COM 2 and COM 4
- 4
- COM 1 and COM 3
- 5
- LPT 2 (but often available and used for a sound card)
- 6
- Floppy drive
- 7
- LPT 1
- 8
- Real time clock
- 9
- Redirected as IRQ 2. Also, used by USB.
- 10
- Available
- 11
- Available (often used for network cards)
- 12
- Mouse (other than serial mouse)
- 13
- Math coprocessor
- 14
- Primary IDE interface
- 15
- Secondary IDE interface