The MiSTer is an FPGA-based device that runs cores for many different platforms. It originates from the MiST project which had an initial goal of creating an FPGA version of the Atari ST computer. Curiously, there is no Atari ST core for the MiSTer at the time this video is being released, but I fully expect one in the future. Lots of different games shown for different arcaden, console, and computer platforms running on the MiSTer. The only game that ran on a real console was a few seconds of Dragon's Curse for the TurboGrafx-16 for illustrative purposes.