Dell OptiPlex Gxi - Manual (Page 38)

IRQ Assignments: OptiPlex GXi
1 IRQ3 is available provided that no other device in the computer (such as a modem) is using COM2 or COM4.
2
If an ISA expansion card is configured for IRQ11, the NIC or PCI IRQ is assigned to another available IRQ line.
IRQ Line System Resource IRQ Line System Resource
IRQ0 System timer IRQ8 RTC
IRQ1 Keyboard port IRQ9 Video controller
IRQ2 Enables IRQ8 through IRQ15 IRQ10 Available
IRQ3 Available
1 IRQ11 NIC/default PCI IRQ
2
IRQ4 Serial port IRQ12 Mouse port
IRQ5 Audio Controller IRQ13 Math coprocessor
IRQ6 Diskette/tape drive controller IRQ14 Primary EIDE channel
IRQ7 Parallel port IRQ15 Secondary EIDE channel