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APPENDIX
64 MI990 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
IRQ3 Serial Port #2
IRQ4 Serial Port #1
IRQ5 Serial Port #3
IRQ7 Serial Port #4
IRQ8 Real Time Clock
IRQ 10 Serial Port #5
IRQ 11 Serial Port #6
IRQ 11 High Definition Audio Controller
IRQ 11 Intel(R) 100 Series/C230 Series Chipset Family
Integrated Sensor Hub
IRQ 13 Numeric data processor
IRQ 19 Intel(R) Active Management Technology - SOL
(COM7)