This is a release of EMU7800, an Atari 7800 emulator implemented using Microsoft's .NET platform. Most 2600 and 7800 titles work well, with 2600 support featuring authentic HMOVE emulation, per Andrew Tower's paper "A Small Opus on the TIA." The stars in Cosmic Ark appear, but without emulation cheats.

To run EMU7800, you will need to have the .NET runtime installed onto your computer. Currently, this means that you will also need to be running Microsoft Windows. (Hopefully this will change in the near future.) In any case, it is a free download from Microsoft's website. To have the capability to build from the included source code, be sure to install the SDK (software development kit) as opposed to just the redistributable runtime. EMU7800 was developed on a machine with a Pentium 4 Celeron 1.7 GHZ processor. This appears more than adequate for emulator performance. Your mileage may vary, and I would be interested in hearing how well it works (or doesn't) on other machines.