|The latest version (released after I made these screenshots), offers
full-screen action. And Rainbow is now available for both Macintosh and PC.
You can get more information on Rainbow, and download a demo version,
by clicking here.|
There was another Macintosh-based emulator called WACKE, but development stopped many years ago with version 1.60. You might still download it if this link is working (it seems to fade in and out).
If you use a PC, you could also try the freeware Atari800WinPlus or Atari800.