Irq assignments: dell™ optiplex™ e1 systems – Dell OptiPlex E1 User Manual
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IRQ Assignments: Dell™ OptiPlex™ E1 Systems
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
IRQ0
System timer
IRQ1
Keyboard port
IRQ2
Enables IRQ8 through IRQ15
IRQ3
1
Available
IRQ4
Serial port
IRQ5
Audio controller
IRQ6
Diskette/tape drive controller
IRQ7
Parallel port
IRQ8
RTC
IRQ9
ACPI
IRQ10
Available
IRQ11
2
NIC/default PCI IRQ
IRQ12
Mouse port
IRQ13
Math coprocessor
IRQ14
Primary EIDE channel
IRQ15
Secondary EIDE channel
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