While browsing an archive of available software for the opensource handheld console GP2X Wiz  , I stumbled upon Wiz2600 .
This is an emulator for the Atari 2600 or Atari VCS console. It enables the user to play Atari 2600 games on the GP2X Wiz handheld.
The emulator is available as opensource .
Installation on the GP2X Wiz is very simple. Just put the wiz2600 folder inside your game folder on the SD card or the builtin NAND Flash and leave the ini file there. Place all game rom images into the roms folder and launch the emulator.
First the user sees a configuration menu. Here various options as screen settings, audio and joystick can be configured. Select the game rom image you want to play and start the emulation. Now the GP2X Wiz will behave like the Atari 2600 and you can play the game. pressing MENU will bring back the configuration menu.
The 2600 functions like RESET and SELECT are mapped to the fire buttons, the directional pad works as the joystick.
From what I tried sofar, the games works. I could play Space Invaders, Jr. Pacman and Mrs Pacman with Wiz2600 well. Only slight problem seems to be the sound. It sounds quite different to what I know from my original Atari 2600jr. The onscreen color scheme also looks a bit off but it does not break the fun.
With Wiz2600 you can easily enjoy Atari 2600 titles on your GP2X Wiz. A musthave for all owners of the GP2X Wiz handheld!