Foft has updated his Multi Atari supporting emulator for the GP2X, heres whats new:
* Merged GP2X and GP32 versions (mostly)
* Added ZIP file support
* GP2X:Added clock speed change (Fast forward uses 250, let me know if it crashes for you)
* GP2X:Fixed crash when displaying onscreen keyboard
* GP2X:config now go in /mnt/sd/roms/a800 (i.e. move it from gpmm/a800 to roms/a800)
* GP2X:Switched to 8-bit mode
* GP2X:Added X and Y buttons
* GP2X:Stereo works (thanks to Rlyeh again)
Download Here --> http://gp2x-emulation.dcemu.co.uk/atari800gp2x.shtml