There are quite a few Atari 2600 emulators out there, but quite possibly
the best is the PC
Atari Emulator by John Dullea. There are very few of the ROMs on this
page that won't run on it. It also has an easy-to-use menu. While the
program runs under DOS, it'll run in a DOS window under Windows '95.
For the instruction manual, click the name of the game.