Looking for driver or information

I've got both Chi Corp./Computer Logics PCTD3 and PCTD16 Pertec-interface tape controlers. What I don't have is a clue as to how to drive them. Normally, this wouldn't be a problem that running down traces and some pencil and paper work wouldn't cure. But, other than for a couple of lines, much of the logic for these cards is hidden inside an early Xilinx FPGA. Thus far, my "pork poking" hasn't given up any information. Customer support at Chi Corporation is polite, but unhelpful. They claim that they don't have any docs for the cards any more (tossed during a move), nor are they sure about software (probably won't work on a modern PC), but they'll sell me a copy of their Outright conversion package for only $695 and it might work--maybe, but no promises. So, I'm wondering if anyone has any information on these beasts or perhaps has hung onto the TDRIVER.EXE or API.EXE files. I'm not interested in using the files, but rather want to use them to give up some clues on how that blasted FPGA is set up. Thanks, Chuck