First time in ages I've felt up to doing old computer stuff, and managed to upgrade an Acorn A3010 from 'totally dead' to 'largely dead', which is good progress!
@SophieRose personally I find the weird ROM disc thing really interesting: makes it almost viable to run the whole thing totally discless, which you can't do with any other Mac.
@SophieRose SE is more practical, more robust, but a bit less charming, and doesn't have the weird ROM disk thing. Practically probably a better choice.
AirTalk board programming time! This highly technical and involved process involves pressing 'up arrow / enter' 50 times while trying not to fall asleep. Try not to marvel too much at my technical competence.