APPENDIX
MB968 User’s Manual
72
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
IRQ4
Serial Port #1
IRQ3
Serial Port #2
IRQ5
Serial Port #3
IRQ11
Serial Port #4
IRQ8
Real Time Clock
IRQ14
Primary IDE
IRQ15
Secondary IDE