APPENDIX
64
MI957 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
IRQ2 Interrupt
Cascade
IRQ3
Serial Port #2
IRQ4
Serial Port #1
IRQ5 Reserved
IRQ6 Reserved
IRQ7 Reserved
IRQ8
Real Time Clock
IRQ9 Reserved
IRQ10
Serial Port #3
IRQ11
Serial Port #4
IRQ12 PS/2
Mouse
IRQ13 80287
IRQ14 Primary
IDE
IRQ15 Secondary
IDE
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