Cheap & simple replacement keyboard for the Model 3/4/4p

[fjkraan]

After implementing a replacement keyboard for my 80's clone of the Model 1, I also tried it on my Model 4p. It works, so I present it here. Apart from the Arduino Nano, only the MT8816 is somewhat special. It is however cheap and easy to get at the moment. I have no plan to create and sell boards, but schematic and KiCAD design files are available.

GitHub - electrickery/ps-2Keyboard2TRS-80: TRS-80 3/4/4p keyboard interface for PS/2 keyboard

TRS-80 3/4/4p keyboard interface for PS/2 keyboard - electrickery/ps-2Keyboard2TRS-80

github.com

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Greetings,
Fred Jan

 

[Patrick.B (TTR)]

nice

 

[Eudimorphodon]

Cool. I have a stash of MT8812’s, maybe I‘ll see if I can cut it down slightly for those.

 

[fjkraan]

... a stash of MT8812’s,

That could probably work. The MT8816 has some weird out of order addressing (could call it a bug), don't know about the 8812. It is documented in the sketch.

Greetings & success,

Fred Jan