There is however also TRON: https://ethw.org/Milestones:TRON_Real-time_Operating_System_Family,_1984 https://ethw.org/Milestones:TRON_Real-time_Operating_Syste

There is however also TRON: https://ethw.org/Milestones:TRON_Real-time_Operating_System_Family,_1984 https://ethw.org/Milestones:TRON_Real-time_Operating_System_... which was demoed running on an 80186 with _multiple_ windows running videos w/o dropping a frame. Described as "The most installed operating system in the world": https://www.linuxinsider.com/story/the-most-popular-operating-system-in-the-world-31855.html https://www.linuxinsider.com/story/the-most-popular-operatin... Unfortunately, the U.S. State Department viewed the Japanese plan to place it on all computers in their educational system as anti-competitive. Really wish it was available for the Raspberry Pi.