IRQ




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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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