THE IRQ CHART

The IRQ (Interrupt Request) is a signal to the CPU via the Interrupt controller chip, to take care of a command. The IRQ number is its priority level for CPU to take the command. The lower the number the higher the priority level.

IRQ NUMBER DEVICE
NMI Non Maskable Interrupt Parity
INTERRUPT CONTROLLER 1
0 Timer Output
1 Keyboard Controller
2 XT - Available
AT - Route to Interrupt Controller 2, IRQ8
3 COM2 OR COM4
4 COM1 OR COM3
5 XT - Hard Disk Controller
AT - LPT2
6 Floppy Disk Controller
7 LPT1
INTERRUPT CONTROLLER 2 AT Only
8 Real Time Clock
9 Software redirect to IRQ2
10 Available
11 Available
12 Available
13 Math Coprocessor
14 Hard Disk Controller
15 Network Cards or SCSI Controller

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IRQ NUMBER	DEVICE
NMI	Non Maskable Interrupt Parity
INTERRUPT CONTROLLER 1
0	Timer Output
1	Keyboard Controller
2	XT - Available AT - Route to Interrupt Controller 2, IRQ8
3	COM2 OR COM4
4	COM1 OR COM3
5	XT - Hard Disk Controller AT - LPT2
6	Floppy Disk Controller
7	LPT1
INTERRUPT CONTROLLER 2 AT Only
8	Real Time Clock
9	Software redirect to IRQ2
10	Available
11	Available
12	Available
13	Math Coprocessor
14	Hard Disk Controller
15	Network Cards or SCSI Controller