FAP80, a retro computer without the retro baggage
This is cool, but there's an argument to be made that the baggage is the whole point of doing retro computing.  You can emulate a Z80 on an STM32 and it will run faster than the real thing.  Much faster.  So why bother with a real Z80?  Because there is something ineffably cool about the "real thing".  It's kind of like vinyl records.  Digital audio is vastly superior by any objective measure, and yet people still want vinyl.  The don't want it <i>despite</i> the clicks and pops and the annoyance of having to clean it and futz with the needle and the turntable speed, they want it <i>because</i> of all of these things.