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Maintenance and Service Guide 6–13
Table 6-13
System Interrupts
Hardware
IRQ
System
Function
IRQ0 System timer
IRQ1 Keyboard controller
IRQ2 Cascaded
IRQ3 COM2
IRQ4 COM1
IRQ5 Audio (default)*
IRQ6 Diskette drive
IRQ7 Parallel port
IRQ8 RTC
IRQ9 Assigned by operating system
IRQ10 Assigned by operating system
IRQ11 Assigned by operating system
IRQ12 Internal point stick or external mouse
IRQ13 Infrared
IRQ14 Primary IDE interface
IRQ15 Secondary IDE interface
✎
PC Cards may assert IRQ3, IRQ4, IRQ5, IRQ7, IRQ9, IRQ10,
IRQ11, or IRQ15. Either the infrared or the serial port may
assert IRQ3 or IRQ4.
*Default configuration; audio possible configurations are IRQ5, IRQ7, IRQ9,
IRQ10, or none.