GP2x-2600 is based upon Stella. Stella is on of the best emulator of Atari 2600 game console, running on many different systems, such as Linux, Solaris, Windows, MacOS/X, WinCE, OS/2, GP2X.

Changes:

– Display and save thumbnail images for each save state
– New speed limiter function
– Add option to display fps rate
– Option to prevent the blue led to be displayed when
L or R are pressed
– Add a simple intro splash screen
– Support iso8859-1 fonts in print text functions
(might be useful to translate menus in german, french …)
– Bug fix and code cleaning

http://zx81.zx81.free.fr/serendipity/index.php?/archives/253-GP2X-2600-Atari-2600-emulator-for-GP2X-v1.0.4.html