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.