So, nobody has stepped up to comment on this ultra-badass keyboard.
I got it at a salvage shop but have not been able to test it, probably because I lack software drivers. It responds with nice clean beeps when I press the keys, but Windows 7 will not see it. I have connected it via PS/2 and also with the big AT plug (on the assumption that it needs a separate power source) but no dice.
Software drivers have always turned up after a trivial internet search in the past, but these seem to be closely-held and proprietary.
Does anybody know how to get anywhere with this? I want to test it, at the minimum, and/or likely sell it, because it is certainly a valuable and all-but-indestructible piece of industrial hardware.
Anyone who wants or needs a truly hard-core keyboard should take this off my hands.