HP TC4400 - Manual (Page 153)

Specifications
Maintenance and Service Guide 6–7
Table 6-6
System Interrupts
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