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IRQ Assignments
Default Dell-Installed Card Placement
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IRQ Line
System Resource
IRQ Line
System Resource
IRQ0
System timer
IRQ8
RTC
IRQ1
Keyboard buffer
IRQ9
Available
IRQ2
Enables IRQ8 through IRQ15
IRQ10
Available
IRQ3
Available
4
IRQ11
Available
IRQ4
Serial port
IRQ12
Mouse port
IRQ5
Available
IRQ13
Math coprocessor
IRQ6
Floppy/tape drive controller
IRQ14
Primary IDE channel
IRQ7
Parallel port
IRQ15
Secondary IDE channel
4
IRQ3 is available provided that no other device in the computer (such as a modem) is using COM2 or COM4.
Card Slot
Card
PCI Slot 1
Open
PCI Slot 2
Audio
PCI Slot 3
Network adapter
PCI Slot 4
Modem