ProSystem is the best emulator of Atari 7800 game console, running on Windows system.
It has been written by Greg Stanton, see http://home.comcast.net/~gscottstanton for details.
Here is a port on Dingoo/Dingux of the version i've previously ported to PSP, Gp2x and Wiz.
Many new features have been added compared to original version, have a look
to the README for details.
How to use it ? Everything is in the README.txt file.
Sources are included, and this package is under the GNU public licence v2, read COPYING.txt
file for more information about it.
You may find it on my blog