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Maintenance and Service Guide 6–17
Table 6-15
System Interrupts
Hardware
IRQ
System
Function
IRQ0 System timer
IRQ1 Keyboard controller
IRQ2 Cascaded
IRQ3 Infrared
IRQ4 COM1
IRQ5 Available for Parallel port
IRQ6 Diskette drive
IRQ7 Available for Parallel port
IRQ8 Real time clock (RTC)
IRQ9 Microsoft ACPI-Compliant System
IRQ12 Internal point stick or external mouse
IRQ13 Numeric Data Processor
IRQ14 Primary IDE Channel
IRQ15 Secondary IDE Channel
IRQ 16 Graphics Controller and USB Host Controller
IRQ 17 Audio and Modem
IRQ 18 USB Host Controller, Cardbus Controller, and FlashMedia
Controller
IRQ 19 USB Host Controller
IRQ 20 LAN Controller
IRQ 21 Mini PCI Wireless Adapter
IRQ 23 USB 2.0 Host Controller and 1394 Host Controller
✎
Either the infrared or the serial port may assert IRQ3 or IRQ4.