On 2012 Feb 1, at 6:56 AM, Nick Allen wrote: As a matter of fact I do, but are we talking the same thing? Briefly, what I have is: - bare keyboard (PCB with switch sensors mounted in stainless steel frames, with encoding matrix and chip) - Microswitch part no.: 61SW12-2 - 1975 (7549) date code - AMI SW 20416 MOS encoder chip - parallel output with strobe - reverse-engineered and tested in 2006 (schematic available) - missing right-hand SHIFT keycap - one non-functioning sensor, which I moved to the right-hand duplicate CTRL position, so no loss of functionality Very nice 70s-era keyboards. Just pressing the keys triggers memories of working at terminals in that era. I had a vague thought of using it one day to make a 70's-style homebrew machine, but that's way way over the horizon in the project queue. Of course, you have to tell us why you are looking for one ..? (You mention DB25, were you looking for something in a detached case?)