I STILL have a fully-functional Z80-based CPM machine in storage; along with an EPSON MX-80 printer.
I keep thinking I’ll get them out, blow out the literal bugs, and show the kiddos what a human can do when dealing with an O/S that knows its place in the universe.
I'm kind of sorry I did, because it was the first CP/M machine to be registered for the Internet "Map" back in the 80s. (This was prior to the advent of the Domain Name System.) And I used to work for the company -- I wrote its BIOS.
Still have the printer we bought a couple of years later, Epson FX-80 (with one pin sticking), though it's not been out of the storage closet in many years.