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6–12 Maintenance and Service Guide
Specifications
Table 6-12
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 Real time clock (RTC)
IRQ9 Infrared
IRQ10 System use
IRQ11 System use
IRQ12 Internal point stick or external mouse
IRQ13 Coprocessor (not available to any peripheral)
IRQ14 IDE interface (hard drive and optical drive)
IRQ15 System use
✎
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.