seems like most of you have gotten OS installed on your Pi's already anyways.
Basically all you need to do to get UAE on it if you have debian on it, or a debian based OS, is go to command console and type in
sudo apt-get install uae
Same works for EUAE, just do the same again and type euae instead of uae
I'm unsure if there are other UAE distibutions running on it at the moment, might be worth googling to see if there are any other repositories that may have them in aside from those registered by default.