APPENDIX
52
IB881 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 PIC2
(IRQ8-15)
IRQ3
Serial Port #2
IRQ4
Serial Port #1
IRQ5 For
PCI
IRQ6
Floppy Disk Controller
IRQ7
Parallel Port #1
IRQ8
Real Time Clock
IRQ9 For
PCI
IRQ10 For
PCI
IRQ11 For
PCI
IRQ12 PS/2
Mouse
IRQ13 Coprocessor
IRQ14 Primary
IDE
IRQ15 Secondary
IDE
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