Time Sharing Operating System

Time Sharing Operating System, or TSOS, is a discontinued operating system for RCA mainframe computers of the Spectra 70 series. TSOS was originally designed in 1968 for the Spectra 70/46, a modified version of the 70/45.[1] TSOS quickly evolved into the Virtual Memory Operating System (VMOS) by 1970. VMOS continued to be supported on the later RCA 3 and RCA 7 computer systems.[2]

Time Sharing Operating System (TSOS)
DeveloperRadio Corporation of America (RCA)
OS familyNot Applicable
Working stateDiscontinued
Source modelUnknown
Initial release1968 (1968)
PlatformsRCA Spectra 70 series mainframe computers
Default user interfaceCommand-line interface

RCA was in the computer business until 1971 when it sold its computer business to Sperry Corporation. Sperry renamed TSOS to VS/9 and continued to market it into the early 1980s. In the mid seventies, an enhanced version of TSOS called BS2000 was offered by the German company Siemens.

While Sperry โ€“ now Unisys โ€“ discontinued VS/9, the BS2000 variant, now called BS2000/OSD, is still offered by Fujitsu Siemens Computers and used by their mainframe customers primarily in Europe.

As the name suggests, TSOS provided time sharing features. Beyond that it provided a common user interface for both time sharing and batch, which was a big advantage over IBM's OS/360 or its successors MVS, OS/390 and z/OS.

See also


  1. Radio Corporation of America (1968). Spectra 70 Time Sharing Operating System Information Manual (PDF).
  2. RCA Computer Systems Division (Dec 1970). RCA Series Information Manual (PDF). pp. 4โ€“17.
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