Dell PowerEdge SC1425 - Manual (Page 24)

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IRQ2 Interrupt controller 1 to enable IRQ8 through IRQ15
IRQ3 Available
IRQ4 Serial port 1 (COM1 and COM3)
IRQ5 Available
IRQ6 Available
IRQ7 Reserved
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 (available if IDE CDROM controller is disabled in BIOS setup)
IRQ15 Reserved (available if IDE CDROM controller is disabled in BIOS setup)