Dell Dimension 2100 - Manual (Page 30)

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