Dell PowerEdge 6850 - Manual (Page 34)

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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 Available
IRQ8 Real-time clock
IRQ9 ACPI functions (used for power management)
IRQ10 Available
IRQ11 Available
IRQ12 Available
IRQ13 Math coprocessor
IRQ14 IDE optical drive controller
IRQ15 Available