Troubleshooting
ROBO-8712E Series User’s Manual
5-12
disable COM1 serial port to release IRQ #4
disable COM2 serial port to release IRQ #3
disable parallel port to release IRQ #7
disable PS/2 mouse to release IRQ #12,
…, etc.
Interrupt Request Lines (IRQ)
A quick review of the basic IRQ mapping is given below for your reference.
IRQ#
Description
IRQ #0
System Counter
IRQ #1
Keyboard
IRQ #2
Programmed Controller
IRQ #3
COM2
IRQ #4
COM1
IRQ #5
Display Controller (Shareable)
IRQ #5
USB 1.0/1.1 UHCI Controller (Shareable)
IRQ #6
Floppy Disk Controller
IRQ #7
Print Port (Parallel Port)
IRQ #8
CMOS Clock
IRQ #9
ACPI Controller (Shareable)
IRQ #9
SM BUS Controller (Shareable)
IRQ #9
Multimedia Device (Shareable)
IRQ #10
USB 1.1 UHCI Controller (Shareable)
IRQ #10
Ethernet Controller (Shareable)
IRQ #11
Ethernet Controller (Shareable)
IRQ #11
USB 2.0 EHCI Controller (Shareable)
IRQ #12
PS/2 mouse
IRQ #13
Data Processor
IRQ #14
Primary IDE Controller
IRQ #15
Secondary IDE Controller
It is then very easy to find out which IRQ resource is ready for additional
peripherals. If IRQ resource is not enough, please disable some devices listed above
to release further IRQ numbers. The IRQ list will show on the Post sequences as
system hardware checking.
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