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Hardware Specifications and Configurations 1-39
System Interrupt Specification
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*
Intel
®
USB UHCI controller-24C2
Intel
®
82852/82855 GM/GME Graphic Controller
Realtek RTL8139 Family PCI Fast Ethernet Controller
IRQ11
Intel
®
USB EHCI controller-24CD
Intel
®
USB UHCI controller-24C4
Intel
®
USB UHCI controller-24C7
Intel
®
Pro/Wireless 2200BG
TI OHCI 1394 host controller
TI PCI1410 CardBus controller
IRQ12 Synaptics PS/2 TouchPad
IRQ13 Numeric data processor
IRQ14 Primary IDE channel
IRQ15 Secondary IDE channel
* Default configuration; audio possible configurations are IRQ5, IRQ7, IRQ9, IRQ10, or none.
NOTE:
ExpressCards may assert IRQ3, IRQ4, IRQ5, IRQ7, IRQ9, IRQ10, IRQ11, or IRQ15. Either
the infrared or the serial port may assert IRQ3 or IRQ4.