Next, to separate serial and Ethernet on the outside of the router he build a short adapter cable ... few inconspicuous holes we love the serial port used on this Dockstar.

Learn what a USB to Serial adapter is used for, when you might need one, and whether installing a driver is required for it ...

it may well have come with an adapter for a 9-pin RS232 serial port. Those mice from a decade or more ago would have contained the software to recognise the interface into which they were plugged ...