This is a retrofit of a Northgate Computer Systems Omnikey Plus (manufactured June 2nd, 1989). I received this keyboard as a gift from a family; it had been sitting in storage for a while so it needed a little TLC. This Omnikey model featured a set of DIP-switches to configure compatibility with a variety of different computers on the market at the time. The key switches are genuine original ALPs and the keycaps are double-shot PBT. I used a Teensy 2.0 to convert the PS/2 signal to USB.