The simplest implementation of 80c85 is MiniMax 8085 by Sergey Kiselev.
It has a very small amount of chips and is easy to build. It has also extension port for connecting keyboard and display.
But for ROM exist only TinyBasic and mon85
I have followed this email list for a years and I have never asked a question...but here goes! I am sitting here with my model 100 and I had an idea to 3D print a replica case and get my hands on an LCD and mechanical keyboard and try to faithfully reproduce the Model 100 with simple additions. I have enlisted a few friends (we are all engineers)... I was wondering of anyone knows of an FPGA implementation of the Model 100 hardware? I want to make a fairly faithful reproduction short of using an 80C85.
Thanks!
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Robert Messer
BARA Sweden