DFI NP900-B16C - Manual (Page 59)

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3
BIOS Setup
Serial Port 1 Use IRQ, Serial Port 2 Use IRQ, Serial Port 3 Use
IRQ and Serial Port 4 Use IRQ
These fields are used to select an IRQ for the onboard serial port 1,
2, 3 or 4.
W83627HF/HG.WDT Time
This field is used to select the time interval of the Watchdog timer. If
the system hangs or fails to function, it will reset at the set time
interval so that your system will continue to operate.