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There are a lot of easy and simple constructions, based on the Z80 CPU. I prefer the simple Grant Searle's Computer. If you prefer the more simple way, you could try the ready-made solution, like the RC2014 Homebrew Computer.


Funny that this post still doesn't have the right answer. The Commodore 128 of course!


A major question to consider is whether it would be acceptable to tie up the Z80 during significant parts of each frame. If one is willing to tolerate a severe amount of CPU loading, one could produce a Z80 video subsystem with a surprisingly small number of off-the-shelf parts. The Sinclar ZX80 used off-the-shelf chips but couldn't maintain a video ...

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