IBASE SI-38 - Manual (Page 44)

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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 on board.
Level Function
IRQ 0 System timer
IRQ 1 Standard 101/102-Key
IRQ 3 Communications Port (COM2)
IRQ 4 Communications Port (COM1)
IRQ 8 System CMOS/real time clock
IRQ 12 PS/2 Compatible Mouse
IRQ 13 Numeric data processor
IRQ 16 High Definition Audio Controller
IRQ 16 PCI standard PCI-to-PCI bridge
IRQ 17 Standard Enhanced PCI to USB Host Controller
IRQ 17 Standard Enhanced PCI to USB Host Controller
IRQ 17 Standard Enhanced PCI to USB Host Controller
IRQ 18 High Definition Audio Controller
IRQ 18 Standard Open HCD USB Host Controller
IRQ 18 Standard Open HCD USB Host Controller
IRQ 18 Standard Open HCD USB Host Controller
IRQ 18 Standard Open HCD USB Host Controller
IRQ 19 PCI standard PCI-to-PCI bridge
IRQ 19 AMD AHCI Compatible RAID Controller