IBASE Technology IB891 - Interrupt Request Lines (IRQ)

APPENDIX
48 IB891 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 #4
IRQ11 Serial Port #3
IRQ12 PS/2 Mouse
IRQ13 80287
IRQ14 Primary IDE