Dennis Kuschel built a minicomputer with a homebrew TTL CPU - it's an 8 bit CPU with 16 bit address space, but it runs a virtual 16 bit CPU which can run Contiki, a multitasking OS with TCP/IP stack and C compiler. The machine even serves its own website:

Via radicalbrad on the 6502 forums.

@EdS I love these. someday I will make my own.

Also entertaining in light of all the sturm and drang around computer hardware vulnerabilities lately. Don't trust Intel or Supermicro to not have backdoors built into them? Make your own CPU!

I'm also quite impressed it serves a website off a 6502 workalike!

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