Pete, I have a few tqk50 controllers (at least they are qbus and run tk50 drives). I'll have to look up the numbers but I'm pretty sure they say tqk50 on them. I am in the Boston, MA area. If I can fire up my eprom programmer and they are of the 27xxx ilk, I can read them. If not, I'll ship you a board, since I am a little closer. Joe Heck