Every hardcore Electronics Engineer and Computer Nerd has a bucket list and there is a Homebrew Retro Computer on that list. I could cheat and buy a RC2014 kit but building it from total scratch is even better.
Now you just don’t order/buy/find the parts and slap it all together. You have to study up on the subject. There is a PDF floating around called “Build your own Z80 Computer” by Steve Ciarcia. Then you have Grant Searle’s Website that is loaded with tons of Schematics and ideas for a minimal chip count Z80 running BASIC and CP/M.
To start off the build I am going to build a curd version of the Zeta256 and branch off of that by adding memory, UART, ROM and so forth.