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APPENDIX B. INTERRUPT REQUEST (IRQ)
Peripheral devices use interrupt request lines to notify CPU for the services required. The following
table shows the IRQ used by the devices on board.
Level
HARDWARE USING THE SETTING
00 System
timer
01
Standard 101/102-Key or Microsoft Natural Keyboard
02
Programmable interrupt controller
03
Communication Port (COM2)
04
Communication Port (COM1)
05
Mobile Intel(R) 915GM/GMS, 915GML Express Chipset Family
08
System CMOS/real time clock
09
Microsoft ACPI-Compliant System
09
Realtek AC’97 Audio
10
Intel(R) Pro/100 VE Network Connection
11
Intel(R) 82801FB/FBM SMBus controller-266A
11
Intel(R) 82801FB/FBM USB Universal Host Controller-2658
11
Intel(R) 82801FB/FBM USB Universal Host Controller-2659
11
Universal Serial Bus (USB) controller
12
PS/2 Compatible Mouse
13
Numeric data processor
14
Primary IDE Channel
15
Secondary IDE Channel
