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APPENDIX

MB500 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 Floppy Disk Controller

IRQ7 Parallel Port #1

IRQ8 Real Time Clock

IRQ9 Reserved

IRQ10 Reserved

IRQ11 Reserved

IRQ12 PS/2 Mouse

IRQ13 80287

IRQ14 Primary IDE

IRQ15 Secondary IDE

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