DFI G5C100-NR - Manual (Page 89)

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BIOS Setup
Onboard Serial Port 1, Onboard Serial Port 2, Onboard Serial Port
3 and Onboard Serial Port 4
3F8, 2F8, 3E8, 2E8 Allows you to manually select an I/O address for
the serial port.
Disabled Disables the serial port.
Note:
The touch screen is internally connected to COM 3. If the LCD
Display Panel supports touch screen, leave the “Onboard Serial
Port 3” field in its default setting because a default address has
already been assigned to this port. Make sure COM 3 is not
attached with a serial device.
Serial Port 1 Mode
COM 1 functions as a serial port or IrDA. You cannot use both at
the same time.
Normal This option sets COM 1 as serial port.
IrDA This option sets COM 1 as IrDA.
Serial Port 1 Use IRQ to Serial Port 4 Use IRQ
These fields are used to select an IRQ for the onboard serial port 1,
2, 3 or 4.