High Quality Content by WIKIPEDIA articles! The Cray Time Sharing System, also known in the Cray user community as CTSS, was developed as an operating system for the Cray-1 or Cray X-MP line of supercomputers. CTSS was developed by the Los Alamos Scientific Laboratory (LASL now LANL) in conjunction with the Lawrence Livermore Laboratory (LLL now LLNL). CTSS was popular with Cray sites in the United States Department of Energy (DOE). The predecessor of CTSS was the Livermore Time Sharing System (LTSS) which ran on Control Data CDC 7600 line of supercomputers. Both LTSS and CTSS were written in higher-level versions of the Fortran programming language, at a time when most operating systems were still written in assembly language, but with additional dynamic memory and other enhancements also developed at LASL and LLL.

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