That guys site is well spending some time wandering about - warning, you may be there for a few hours!! Home-page:-
https://www.nonstopsystems.com/radio/fr ... o_home.htmSome time ago I came across a site with home-built Enigma machines, sadly and rather unusually I didn't bookmark it.
Of course an Enigma machine can be emulated in a micro with a few pages of code. I did see a version written in Basic many years ago for the old BBC B computer. No, I don't have a copy...
Steve A.