[lokedhs]

The one that was the go-to manual back in the days was the Atari Compendium. I still have the book on my shelf.

I have seen digital versions (scans, I guess) floating around online. I don't know how complete they are.

There is still a demoscene for the Atari, although it's of course much smaller these days. You can find some pointers on our group's website: www.dhs.nu

[Annatar]

Wait, you’re from the Dead Hackers Society? Holy #$%*!, you guys are legends on the ST!

[lokedhs]

Yes, that's where my nickname comes from. :-)