Dell POWEREDGE 1855 - Manual (Page 31)

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IRQ Line Assignment
IRQ0 System timer
IRQ1 Keyboard controller
IRQ2 Interrupt controller 1 to enable IRQ8 through IRQ15
IRQ3 Available
IRQ4 Reserved for Console Redirection
IRQ5 Remote access controller
IRQ6 Available
IRQ7 Available
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 Available
IRQ15 Available