This is a simple CPU I made using a ROM to perform addition and hold the state machine. It works on 4-bits at a time to give a 16-bit accumulator.
This machine I made as an experiment in Stack Machine architectures. The system is 32-bit clean.
I wanted full colour on my Apple //c so I put together a small board which converts the output on 15-pin connector to component video. The colour quality was very clear.
I started this shortly after I left school. There's a whole lot more at http://kaput.retroarchive.org/
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thank you for your time and generosity in sharing these marvelous projects, I ever wished to learn how to generate color, I already did a character terminal but in black and white, I searched for your avr color generator code, Is it available for all?