GP2X-2600 is an Atari 2600 emulator for GP2x and based upon the famous Atari 2600 emulator Stella, initially coded by Bradford Mott.

Changes:

– Auto-fire mode, press RTrigger+X to switch it on/off
useful for games such as space invaders !
On given games, the auto fire can’t be stopped, so an
option to stop it, is available in the settings menu.
– RTrigger/LTrigger keys can be used in the keyboard
settings menu to navigate between Normal, LTrigger
and RTrigger compose mapping.
– Add several new hotkeys :
. settings such as fps, render mode, auto fire speed
can now be directly modified inside the emulator
(no need to enter in the settings menu)
. quick save / quick load current state
(no need to enter in the main menu)
– Default Hotkeys can now be set in the keyboard mapping menu
(useful to add hotkeys on existing/previous keyboard files)

http://zx81.zx81.free.fr/serendipity/index.php?/archives/298-GP2X-2600-Atari-2600-emulator-for-GP2X-v1.0.6.html