A while back I obtained a United U-2200. Based on feedback from several members in earlier posts, the actual Uniteon keyboards are very rare. I know Apple II+ keyboards can be modified to work, but it pains me to tear apart an Apple II+ to scavenge it's keyboard.
That being said, I am looking for alternatives and would welcome any suggestions.
My thought is to take a 'claky' USB keyboard and convert it to work as the Uniteon's externally connected keyboard. I am just beginning this quest and the following comes to mind.
1) I suspect the exterior plug of the Unitron is like the 16 pin keyboard connector on an Apple II+ motherboard. From this, I suspect the Unitron is expecting the post encoder signals from an Apple II+ keyboard.
2) This makes me think the solution would be to use the solutions employed with Teensys to interface vintage keyboards as USB keyboards but in this case "reverse" the process and change the USB keyboards signals into post encoder signals for the Unitron.
I decided to use a PS2 keyboard and this solution.......as a first attempt.