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Compatible Time-Sharing System
The Compatible Time-Sharing System (CTSS), was one of the first time-sharing operating systems; it was developed at MIT's Computation Center. CTSS was first demonstrated in 1961, and was operated at MIT until 1973. During part of this time, MIT's influential Project MAC also ran CTSS, but the system did not spread beyond these two sites.
CTSS was described in a paper presented at the 1962 Spring Joint Computer Conference, and greatly influenced the design of other early time-sharing systems.
==Overview==
The "Compatible" in the name refers to backwards compatibility with the standard batch processing OS for the IBM 7094, the FORTRAN Monitor System (FMS). CTSS ran an unaltered copy of FMS, processing a standard batch stream, in a pseudo-virtual 7094 provided by its ''background'' facility. (The hardware was partly but not fully virtualized; see History of CP/CMS for further details.) Background FMS jobs could access tapes normally, but could not interfere with foreground time-sharing processes or the resources used to support them.
CTSS was very influential. It showed that time-sharing was viable; it fostered important new applications for computers; it had a significant influence on the next generation of time-sharing systems, notably CP/CMS. Its direct successor, Multics, pioneered many core concepts of current operating systems.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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