IBASE MB950 - Manual (Page 60)

APPENDIX
56 MB950 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, 4
IRQ4 Serial Port #1, 3
IRQ5 Reserved
IRQ6 Reserved
IRQ8 Real Time Clock
IRQ9 Reserved
IRQ10 Reserved
IRQ11 Reserved
IRQ12 PS/2 Mouse
IRQ13 80287
IRQ14 Primary IDE
IRQ15 Secondary IDE