Irq Assignments - Dell Dimension 2100 System Reference Manual

IRQ Assignments

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