It would be a standard parallel cable, the equipment has a parallel (centronics) port & internal drivers to print to most standard parallel printers HP laserjet series, Epson's etc.
Trouble is it's an old bit of kit & would be approx £25,000 to buy a newer version (with ethernet) that would talk to a print server, I need to get some data off of it quite quickly, quicker than I can source a new parallel port printer. Given time I figure I could rewrite a patch for some OS software to do it, but was hoping someone had a better idea.
I was figuring that with a print server the print data is embedded into a TCP/IP packet sent to the server that then redirects that data to whatever printer is connected to that server, that either someone else had already done this in S/W or else it would be quite easy to do.
... I guess maybe I'm wrong, but I was figuring that it would involve possibly buffering it as a postscript file & then redirect it using two different apps. Guess I should look at the CUPS source to see how they transfer the data from Internet packets to the printer.