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System interrupt specifications
Hardware IRQ System function
IRQ0 System timer
IRQ1 Standard 101-/102-Key or Microsoft® Natural Keyboard
IRQ2 Cascaded
IRQ3 Intel 82801DB/DBM USB2 Enhanced Host Controller—24CD
IRQ4 COM1
IRQ5* Conexant AC—Link Audio Intel 82801DB/DBM SMBus Controller—24C3 Data Fax
Modem with SmartCP
IRQ6 Diskette drive
IRQ7* Parallel port
IRQ8 System CMOS/real-time clock
IRQ9* Microsoft ACPI-compliant system
IRQ10* Free resource
IRQ11 ICH9 SMBus controller
IRQ12 Synaptics PS/2 TouchPad
IRQ13 Numeric data processor
IRQ14 Free resource
IRQ15 Free resource
IRQ16 USB UHCI controller
Micron card reader controller
1394 OHCI controller
IRQ17 High definition audio controller
Ethernet controller
IRQ18 USB UHCI controller
IRQ19 USB UHCI / EHCI controller
IRQ20 SATA controller
IRQ21 USB UCHI controller
IRQ22 High definition audio controller
IRQ23 HP mobile data protection sensor
*Default configuration; audio possible configurations are IRQ5, IRQ7, IRQ9, IRQ10, or none.
NOTE: 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.
System interrupt specifications 99