APPENDIX
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
IRQ0
IRQ1
IRQ2
IRQ3
IRQ4
IRQ5
IRQ6
IRQ7
IRQ8
IRQ9
IRQ10
IRQ11
IRQ12
IRQ13
IRQ14
IRQ15
Function
System Timer Output
Keyboard
Interrupt Cascade
Serial Port #2
Serial Port #1
Reserved
Floppy Disk Controller
Parallel Port #1
Real Time Clock
Reserved
Reserved
Reserved
PS/2 Mouse
80287
Primary IDE
Secondary IDE
60 | 2804080 User’s Manual |
