Dell Latitude D630 - Manual (Page 138)

138 System Setup Program
Changing Printer Modes
Set the Parallel Mode option according to the type of printer or device
connected to the parallel connector. To determine the correct mode to use, see
the documentation that came with the device.
Setting
Parallel Mode to Disabled disables the parallel port and the port’s LPT
address, which frees computer resources for another device to use.
Changing COM Ports
Serial Port allows you to map the serial port COM address or disable the serial
port and its address, which frees computer resources for another device to use.