Chapter 4 – Programming
4-3
IRQ Map
Table Chapter 4 -3 describes the AT-bus IRQ map.
Table Chapter 4 -3. AT-bus IRQ Map
Interrupt
Description
IRQ0
System timer tick
IRQ1
Keyboard
IRQ2
Reserved
IRQ3
COM2
IRQ4
COM1
IRQ5
Available
IRQ6
Floppy drive
IRQ7
Parallel port
IRQ8
Real-time clock
IRQ9
Cascade
IRQ10
Abort switch
IRQ11
Available
IRQ12
Available
IRQ13
Reserved (387)
IRQ14
Fixed disk
IRQ15
Available
Note
COM1, COM2, and parallel port IRQs are available if software does not
use the ports or does not use the interrupt.
Note
PCI IRQs need to be mapped to an AT-bus IRQ. This is done through
the BIOS setup. Refer to Chapter 3 for more information.
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