IBASE SI-06 - Manual (Page 41)

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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.
Level Function
IRQ 0 System timer
IRQ 1 Standard PS/2 Keyboard
IRQ 4 Communications Port (COM1)
IRQ 7 Intel(R) N10/ICH7 Family SMBus Controller - 27DA
IRQ 8 System CMOS/real time clock
IRQ 12 Microsoft PS/2 Mouse
IRQ 13 Numeric data processor
IRQ 18 Intel(R) N10/ICH7 Family USB Universal Host Controller - 27CA
IRQ 19 Intel(R) N10/ICH7 Family Serial ATA Storage Controller - 27C0
IRQ 22 High Definition Audio Controller
IRQ 23 Intel(R) N10/ICH7 Family USB Universal Host Controller - 27C8
IRQ 23 Intel(R) N10/ICH7 Family USB2 Enhanced Host Controller - 27CC
IRQ 4294967292 Realtek PCIe GBE Family Controller
IRQ 4294967293 Intel(R) Graphics Media Accelerator 3600 Series
IRQ 4294967294 Intel(R) N10/ICH7 Family PCI Express Root Port - 27D0