Tron OS by Ken Sakamura

In 1984 Prof. Ken Sakamura (坂村 ) of Tokyo University developed a basic computer software called Tron or “The Realtime Operating system Nucleus”. It enabled a very fast computer processing speed and was so simple that anyone could use it. Its specifications were open source.

In 1988, Tron computers for U.S. elementary and junior high schools were obstructed, There, Windows OS monopolized the personal computer industry.
Tron extended its software to cellular phones, digital cameras, televisions, printers, car engines and navigation systems, as well as point of sales systems.  Now it is used in 60% of industrial equipment and information appliances. Microsoft eventually compromised with Tron in a joint development of a new OS that was completed in 2003. It had the 60% share in the industry.