Why would you assume that finding and installing
some
software would be easier than making up a simple molex adapter
connector. As I recall, it was a 9 pin molex but I could
be wrong. That is all of 9 wires to deal with.
IIRC it's easier than that. The pinout of the connectors on the 3-port
serial card and the pinout of the RS232 connector on the terminal logic
board are the _same_. So all you have to do is move a complete connector
from one board to the other -- no wires to swap round,
or adapters to
make up.
-tony