User`s manual

IMB205 LGA775 ATX Motherboard User’s Manual
Hardware Description
47
4.5 Interrupt Controller (IRQ) Map
The IMB205 Series is a 100% PC compatible control board.
It consists of 16 interrupt request lines, and four out of them
can be programmable. The mapping list of the 16 interrupt
request lines is shown as the following table.
IRQ Parity check error
IRQ0
System timer
IRQ1
Standard 101/102-Key or Microsoft Natural PS/2 Keyboard
IRQ2
Interrupt rerouting from IRQ8 through IRQ15
IRQ3
Communication Port (COM2)
IRQ4
Communication Port (COM1)
IRQ5
PCI Device Share
IRQ7
Parallel port
IRQ8
System CMOS/real time clock
IRQ9
Microsoft ACPI-Compliant System
IRQ10
PCI Device Share
IRQ11
PCI Device Share
IRQ12
Microsoft PS/2 Mouse
IRQ13
Numeric data processor
IRQ14
Primary IDE Channel
IRQ15
Secondary IDE Channel