EMU7800 v1.2, an Atari 7800 emulator, was released today. EMU7800 is for Windows and was written in .NET. You can grab the latest version from their sourceforge page. According to the developers, most ProSystem (7800) and VCS (2600) titles run well. EMU7800 runs on Windows XP SP3 and higher systems. Performance is sufficient on current hardware. See the changelog below.
Fixed emulation regressions from prior release that were known to impact KLAX, Ace of Aces, Pitfall, and Grandprix
Restored Keypad controller input for 2600