HP R4003XX, R4000, R4001XX, R4012US, R4025US, R4150EA System Interrupts, Hardware IRQ System Function

Specifications

	Table 6-8
	System Interrupts
Hardware IRQ	System Function
IRQ0	System timer
IRQ1	Quick Launch buttons
IRQ2	Cascaded
IRQ3	USB2 Enhanced Host Controller—24CD
IRQ4	COM1
IRQ5*	Conexant AC—Link Audio
	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*	USB UHCI controller—24C2
	GM/GME Graphic Controller
	Realtek RTL8139 Family PCI fast Ethernet Controller
IRQ11	USB EHCI controller—24CD
	USB UHCI controller—24C4
	USB UHCI controller—24C7
	Pro/Wireless 2200BG
	TI OHCI 1394 host controller
	TI PCI1410 CardBus controller

*Default configuration

✎PC Card may assert IRQ3, IRQ4, IRQ5, IRQ7, or IRQ20.

Maintenance and Service Guide 6–11