My hat is off to a chap in the U.K. named Chris Lam. He is the author of a Macintosh-based, shareware Atari emulator called Rainbow, which was used to make all of the screenshots here. Why let these games be mere memories? Here's Rainbow in action:

The latest version (released after I made these screenshots), offers full-screen action! You can get more information on Rainbow, and download a demo version, by clicking here.