- Time Sharing Operating System
TSOS stands for
Time Sharing Operating System; it was an operating system for RCA ( Radio Corporation of America) mainframesof the RCA Spectra 70series.
RCA was in the computer business until 1971. Then it was sold to
Sperry Corporation; Sperry offered TSOS renaming it to VS/9. In the mid seventies, an enhanced version of TSOS was offered by the German company Siemensand was called BS2000here.
While Sperry (respectively Univac after the company was renamed) discontinued VS/9 in the early 80's, BS2000, now called BS2000/OSD is still offered by
Fujitsu Siemens Computersand used on their mainframe customers primarily in Europe.
TSOS was the first operating system that supported virtual addressing of the main storage. Beyond that it provided a unique user interface for both, time sharing and batch which was a big advantage over
IBM's OS/360or their successors MVS, OS/390and z/OSas it simplified the operation.
Timeline of operating systems
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