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In the “old” days, we had to set these IRQs manually, to avoid equipment conflicts.  Now, Windows sets these IRQs automatically when you install the system and subsequent equipment.  Nevertheless, sometimes it’s necessary to do some manual fine-tuning, so here they are:

IRQ NUMBER

WHAT IT’S USED FOR

IRQ 0

THE COMPUTER’S INTERNAL TIMER

IRQ 1

THE KEYBOARD

IRQ 2

NOT USABLE

IRQ 3

SERIAL PORT COM2, MOUSE OR MODEM

IRQ 4

SERIAL PORT COM1, MOUSE OR MODEM

IRQ 5

PARALLEL PORT LPT2

IRQ 6

FLOPPY DISK

IRQ 7

PARALLEL PORT LPT 1

IRQ 8

INTERNAL CLOCK

IRQ 9 -13

USUALLY AVAILABLE

IRQ 14

HARD DISK

1RQ 15

 USUALLY AVAILABLE

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