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APPENDIX
52 MI889 User’s Manual
B. 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
IRQ0 System timer
IRQ1 PS/2 Keyboard
IRQ3 Communications Port (COM2)
IRQ4 Communications Port (COM1)
IRQ5 Intel(R) ICH8 Family SMBus Controller - 283E
IRQ8 System CMOS/real time clock
IRQ9 Microsoft ACPI-Compliant System
IRQ10 Communications Port (COM4)
IRQ11 Communications Port (COM3)
IRQ12 PS/2 Mouse
IRQ13 Numeric data processor
IRQ14 Primary IDE Channel
IRQ16 Intel(R) Graphics Media Accelerator 3150
IRQ16 Realtek PCIe GBE Family Controller
IRQ16 Standard Universal PCI to USB Host Controller
IRQ17 Realtek PCIe GBE Family Controller #2
IRQ18
Intel(R) ICH8 Family USB Universal Host Controller -
2832
IRQ18
Intel(R) ICH8M 3 port Serial ATA Storage Controller -
2828
IRQ19
Intel(R) ICH8 Family USB Universal Host Controller -
2831
IRQ21 Microsoft UAA Bus Driver for High Definition Audio
IRQ22 Intel(R) ICH8 Family PCI Express Root Port 1 - 283F
IRQ22 Intel(R) ICH8 Family PCI Express Root Port 5 - 2847
IRQ23 Intel(R) ICH8 Family PCI Express Root Port 6 - 2849
IRQ23
Intel(R) ICH8 Family USB Universal Host Controller -
2830
IRQ23
Intel(R) ICH8 Family USB2 Enhanced Host Controller
- 2836