A friend of mine in Toronto dug up an old Diasonic medical mechanical keyboard with MX black and gray switches, apparently. It has a non-standard connector, not PS/2 or AT or XT, he says it has about fifty wires. It also has a bunch of strange keys like "VCR MENU", "ICONS", "SPLR", "COLOR" and "UPDATE SCREEN".
Model # is 500-00937-01A
He's gonna upload some pics when he gets the chance.