TSOS, the Time Sharing Operating System, was an operating system RCA designed in 1968 for its Spectra 70/46 mainframe within the Spectra 70 series, offering time-sharing features similar to CTSS along with a unified interface for both time-sharing and batch processing. It evolved by 1970 into the Virtual Memory Operating System, VMOS, and after RCA left the computer business in 1971, Sperry Corporation acquired the division and renamed the system VS/9; Siemens later built an enhanced variant, BS2000, which Fujitsu still supports today as BS2000/OSD for customers in Europe. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/
Sources
Wikipedia: Time Sharing Operating System
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