For the two people in the world who were wondering this, GNU Emacs runs just fine under Debian on a Raspberry Pi. It doesn’t leave much memory available for other stuff so don’t expect to do a lot at the same time as you’re running emacs. But it works!
I love Emacs. It’s the editor I grew up with. I’ve been using it for over 30 years. I don’t think I could switch to another editor now if I wanted to. There’s even an excellent GUI port of it to MacOS called Aquamacs that I use all the time.
I come not to praise Emacs but not to bury it, either. More