Dell PowerEdge 1650 Installation And Troubleshooting Manual page 23

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 the second interrupt controller to enable IRQ8 through IRQ15
IRQ3 Available
IRQ4 Used by serial port 1 (COM1 and COM3)
IRQ5 Used by embedded server management hardware
IRQ6 Used by the diskette drive controller
IRQ7 Available
IRQ8 Used by the real-time clock
IRQ9 Reserved for ACPI if Microsoft® Windows® 2000 operating system is running
IRQ10 Available
IRQ11 Available
IRQ12 Used by the PS/2 mouse port unless the mouse is disabled in the System Setup program
IRQ13 Used by the math coprocessor
IRQ14 Used by IDE CD drive controller
IRQ15 Available unless used by IDE hard drive controller
NOTE: For the full name of an abbreviation or acronym used in this table, see
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"Abbreviations and Acronyms."