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.
ExpressCards may assert IRQ3, IRQ4, IRQ5, IRQ7, IRQ9, IRQ10, IRQ11, or IRQ15. Either
the infrared or the serial port may assert IRQ3 or IRQ4.
