Dell PowerEdge 1500SC - Manual (Page 14)

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Table 3-1. IRQ Line Assignment Defaults
IRQ Line Used By/Available
IRQ0 Used by the system timer
IRQ1 Used by the keyboard controller
IRQ2 Used by interrupt controller 1 to enable IRQ8 through IRQ15
IRQ3 Used by serial port 2 (COM2 and COM4)
IRQ4 Used by serial port 1 (COM1 and COM3)
IRQ5 Available unless used by a secondary parallel port
IRQ6 Used by the diskette drive controller
IRQ7 Used by the primary parallel port
IRQ8 Used by the real-time clock
IRQ9 Used for ACPI functions
IRQ10 Available
IRQ11 Available
IRQ12 Used by the PS/2 mouse port unless the mouse is disabled in the System Setup program
IRQ13 Used for floating-point error
IRQ14 Available
IRQ15 Embedded server management
NOTE: For the full name of an abbreviation or acronym used in this table, see " Abbreviations and Acronyms ."