IRQs Assignments (Standard)

IRQ =0 TIMER CHANNEL

IRQ = 1 KEYBOARD

IRQ = 2 C ASCADE CONTROLLER

IRQ = 3 SERIAL PORT 2

IRQ = 4 SERIAL PORT 1

IRQ = 5 PARALLEL PORT 2

IRQ = 6 FLOPPY DISK

IRQ = 7 PARALLEL PORT 1

IRQ = 8 REAL TIME CLOCK

IRQ = 9 REDIRECT TO IRQ 2

IRQ = 10 RESERVED

IRQ = 11 RESERVED

IRQ = 12 RESERVED

IRQ = 13 MATH PROCESSOR

IRQ = 14 HARD DISK CONTROLLER

IRQ = 15 RESERVED

Example: Standard Assignments of IRQs

IRQ 10 = USB CONTROLLER

IRQ 9 = SMBUS

IRQ 11 = COMMUNICATION CONTROLLER

IRQ 3 = ETHERNET CARD (NIC)