For those curious to play with a commercially published 2600 game, the source for Imagic's Dragonfire was released by the author. It pastes nicely into the IDE, fully working without modification. See http://www.atariage.com/2600/archives/source/Dragonfire_sour... for info and the .tar.gz release.

For ease of copying and pasting it into the IDE, see http://pastebin.com/4nrYTt2X.