TS-UGOS 4 (codenamed Sydney) is a graphical operating system developed and released by Theorysonic. It was released on May 11, 1991.
The development of TS-UGOS 4 began on April 25, 1989, thirteen days after the release of TS-UGOS 3.
- RealityX API for game programming and multimedia, replaces the old TSGI API for improved features and technology. Limited 3D support.
- Rounded taskbar.
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