IBASE MB980 - Manual (Page 76)

APPENDIX
72 MB980 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 Output
IRQ1 Keyboard
IRQ3 Serial Port #2
IRQ4 Serial Port #1
IRQ8 Real Time Clock
IRQ14 Primary IDE
IRQ15 Secondary IDE