Dell PowerEdge 2450 - Manual (Page 35)

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IRQ0 Used by the system timer
IRQ1 Used by the keyboard to signal that the output buffer is full
IRQ2 Used by interrupt controller 2
IRQ3 Used by serial port 2 (COM2 and COM4) or PCI device
IRQ4 Used by serial port 1 (COM1 and COM3) or PCI device
IRQ5 Available unless used by a secondary parallel port
IRQ6 Used by the diskette drive controller
IRQ7 Used by the primary parallel port or PCI device
IRQ8 Used by the RTC
IRQ9 Used by ACPI
IRQ10 Available
IRQ11 Available
IRQ12 Used by the PS/2 mouse port, unless mouse is disabled in Sys-
tem Setup program
IRQ13 Reserved for floating-point errors
IRQ14 Available
IRQ15 Used by ESM
NOTE: For the full name of an abbreviation or acronym used in this table, see "Abbreviations and
Acronyms."