Stella is a multi-platform Atari 2600 VCS emulator released under the GNU General Public License (GPL). The Atari 2600 Video Computer System (VCS), introduced in 1977, was the most popular home video game system of the early 1980’s. Now you can enjoy all of your favorite Atari 2600 games on your Pandora device thanks to Stella!

Release notes:

This is just a quick port to the Pandora of the current (20111003) SVN-version. No bios-file or similar data is needed to run the emulator. This version does not use hardware-acceleration and does not run PAL-games, but it should work fine with NTSC-games and still should be fast enough to run at standard speed. You also can pass a rom-name to the run.sh-script for example by using /usr/pandora/scripts/pnd_run.sh. run pnd_run.sh without any parameter for a short description.

http://repo.openpandora.org/?page=detail&app=stella-svn