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That is old hardware, but looks so cool. I was not able to find the support site, maybe someone else has a clue. But for the moment, do you want to try some other stuff? Can you check and post the Hardware ID of the USB devices recognized on Windows? I'm guessing there should be two Hardware IDs, one for the serial adapter and other for the parallel adapter. Maybe with the hardware ids we can find something.
Other thing that may work (or not) is trying to see if it recognizes the HardwareID of this device with some other driver. Or it may not, it is only a wild shot.