Pandora-Atari is a port of Atari800. Atari800 is an emulator for the 800, 800XL, 130XE and 5200 models of the Atari personal computer.

http://zx81.zx81.free.fr/serendipity/index.php?/archives/442-Pandora-Atari-Atari-8001305200-Emulator-for-Pandora-v1.1.0.html