Theorysonic Operating System

The Theorysonic Operating System, often abbreviated as TS-OS or TS-OS 1 by fans is a graphical operating system developed and released by Theorysonic and the first version of TSUG. It was released in 1973. It is the first version of Theorysonic graphical operating system. It was also the world's first operating system.

History
The development of TS-OS began in 1965. TS-OS 1 took eight years to develop before being released.

Features

 * TS-DOS