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Appendix
Appendix 2: Interrupt Request Lines (IRQ)
Peripheral devices use interrupt request lines to notify CPU for the service
required. The following table shows the IRQ used by the devices on board.
Level
Function
IRQ 01
Standard 101/102-Key or Microsoft Natural PS/2 Keyboard
IRQ 03
Communications Port
IRQ 04
Communications Port
IRQ 06
Standard floppy disk controller
IRQ 08
System CMOS/real time clock
IRQ 09
Microsoft ACPI-Compliant System
IRQ 10
Communications Port
IRQ 12
PS/2 Compatible Mouse
IRQ 14
Primary IDE Channel
Intel® 82801G (ICH7 Family) USB Universal Host Controller -
IRQ 16
27CB
IRQ 16
Intel® 82801G (ICH7 Family) PCI Express Root Port - 27D0
IRQ 16
Microsoft UAA Bus Driver for High Definition Audio
IRQ 16
Realtek RTL8168C(P)/8111C(P) PCI-E Gigabit Ethernet NIC
IRQ 16
Mobile Intel® 945 Express Chipset Family
IRQ 17
Intel® 82801G (ICH7 Family) PCI Express Root Port - 27D2
IRQ 17
Realtek RTL8168C(P)/8111C(P) PCI-E Gigabit Ethernet NIC
IRQ 18
Intel® 82801G (ICH7 Family) PCI Express Root Port - 27D4
Intel® 82801G (ICH7 Family) USB Universal Host Controller -
IRQ 18
27CA
Intel® 82801G (ICH7 Family) USB Universal Host Controller -
IRQ 19
27C9
Intel® 82801GBM/GHM (ICH7-M Family) Serial ATA Storage
IRQ 19
Controller - 27C4
Intel® 82801G (ICH7 Family) USB Universal Host Controller -
IRQ 23
27C8
Intel® 82801G (ICH7 Family) USB2 Enhanced Host Controller
IRQ 23
- 27CC
- 69 -
- 69 -
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