Dell PowerEdge 850 Installation And Troubleshooting Manual page 22

IRQ2 Interrupt controller 1 to enable IRQ8 through IRQ15
IRQ3 Available
IRQ4 Serial port 1 (COM1 and COM3)
IRQ5 Remote access controller
IRQ6 Diskette drive controller
IRQ7 Parallel port
IRQ8 Real-time clock
IRQ9 ACPI functions (used for power management)
IRQ10 Available
IRQ11 Available
IRQ12 PS/2 mouse port unless the mouse is disabled through the System Setup program
IRQ13 Math coprocessor
IRQ14 IDE optical drive controller
IRQ15 Available
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