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Buy the docking port for the lappie. Normally not too dear and also gives a better power supply to the USB ports and lifts the lappie off the desk top for cooling. Normally adds Serial and Para ports but needs mains power.
If in the field you may be able to buy a Legacy Extender, (DELl product name ) which just clips on underneath to the desktop plug. We get them for our engineers for product support which still use para and serial connections.
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