I bought this E-mu Drumulator in a bought 1988. I found it used at a music shop in Portland, Oregon. I seem to remember that is cost $75.
Just recently, I noticed that it had the latest OS for the Drumulator, and that meant that it could recieve MIDI. But my Drumulator didn’t have a MIDI port, so I opened it up and intalled a MIDI port. It’s pretty cool, and it responds to 15 levels of velocity.