IRQ0	system timer (cannot be changed)
IRQ1	keyboard controller (cannot be changed)
IRQ2?	cascaded signals from IRQs 8–15 (any devices configured to use IRQ 2 will actually be using IRQ 9)
IRQ3?	serial port controller for serial port 2 (shared with serial port 4, if present)
IRQ4?	serial port controller for serial port 1 (shared with serial port 3, if present)
IRQ5?	parallel port 2 and 3 or sound card
IRQ6?	floppy disk controller
IRQ7?	parallel port 1. It is used for printers or for any parallel port if a printer is not present. It can also be potentially be shared with a secondary sound card with careful management of the port.

IRQ8	real-time clock (RTC)
IRQ9?	Advanced Configuration and Power Interface (ACPI) system control interrupt on Intel chipsets.[1] Other chipset manufacturers might use another interrupt for this purpose, or make it available for the use of peripherals (any devices configured to use IRQ 2 will actually be using IRQ 9)
IRQ10?	The Interrupt is left open for the use of peripherals (open interrupt/available, SCSI or NIC)
IRQ11?	The Interrupt is left open for the use of peripherals (open interrupt/available, SCSI or NIC)
IRQ12?	mouse on PS/2 connector
IRQ13?	CPU co-processor or integrated floating point unit or inter-processor interrupt (use depends on OS)
IRQ14?	primary ATA channel (ATA interface usually serves hard disk drives and CD drives)
IRQ15?	secondary ATA channel

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