ProSystem is the best emulator of Atari 7800 game console, running on Windows system. It has been written by Greg Stanton, see Greg Stanton web site for details. Here is a port on GP2X-Wiz of the version that ZX-81 had previously ported to PSP.

Quote:

Many new features have been added compared to GP2X-F100 version. Here is a copy of the changelog :

– Cheat support !
– New background images
– Text editor to write your own comments on games
– Text editor to modify the global cheat.txt file
– Display first comment line while browsing game files
– Memory monitoring engine to find your own cheat code !
– Improve file requester with virtual keyboard to choose
sequentially rom files beginning with a given letter
– Add documentation for settings in help menu
– A thumbnail image is now displayed in the file requester
while selecting any file with the same name of a previously
saved game (rom, keyboard, settings).
It might be very helpful to recognize that game later if you
have thousand different games on your disk and rom folders !

http://zx81.zx81.free.fr/serendipity/index.php?/archives/383-Wiz-7800-Atari-7800-emulator-for-Wiz-v1.1.0.html