Vertical orientation was the standard for many "Golden Age" classics and remains popular for specific genres. Why did early arcade games use vertical displays?
By using "split" ROM sets within these packs, you can remove unwanted horizontal games and clones to save significant disk space. Top Games Included in Vertical ROM Packs
Games like Pac-Man or Donkey Kong were designed with a 3:4 or 9:16 aspect ratio. Playing these on a vertical screen provides the original, authentic experience.