B. interrupt request lines (irq) – IBASE MB961 User Manual
Page 74
APPENDIX
70
MB961 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
IRQ3
Serial Port #2
IRQ4
Serial Port #1
IRQ5
Serial Port #3 & Serial Port #4 & Parallel Port #1
IRQ6
Reserved
IRQ7
Reserved
IRQ8
Real Time Clock
IRQ9
Microsoft ACPI-Compliant System
IRQ10
Intel(R)6 Series /C200 Series Chipset Family SMBus
Controller-1C22
IRQ12
PS/2 Mouse
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