Compatible Time-Sharing System

The Compatible Time-Sharing System, or the 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 Project MAC had a second copy of CTSS, but the system did not spread beyond two sites (though this applies to many early computer systems). CTSS was described in a paper presented at the 1962 Spring Joint Computer Conference.

History of IBM mainframe operating systems
Early mainframe computers
  • GM OS & GM-NAA I/O (1955)
  • BESYS (1957)
  • UMES (1958)
  • SOS (1959)
  • IBSYS (1960)
  • CTSS (1961)
S/360 and successors
  • BOS/360 (1965)
  • TOS/360 (1965)
  • TSS/360 (1967)
  • MTS (1967)
  • ORVYL (1967)
  • MUSIC (1972)
    • MUSIC/SP (1985)
DOS/360 and successors (1966)
  • DOS/VS (1972)
  • DOS/VSE (1980s)
  • VSE/SP late (1980s)
  • VSE/ESA (1991)
  • z/VSE (2005)
OS/360 and successors (1966)
  • MFT (1966)
  • MFT II (1968)
    • OS/VS1 (1972)
    • OS/VS1 BPE
  • MVT (1967)
    • 65MP
    • OS/VS2R1 (SVS) (1972)
    • MVS (OS/VS2R2 and later) (1974)
      • MVS/SE (1978)
      • MVS/SE 2 (1979)
      • MVS/SP Version 1 (1980)
      • MVS/XA (1983)
      • MVS/ESA (1988)
      • OS/390 (1995)
      • z/OS (2000)
VM line
  • CP-40/CMS (1967)
  • CP-67/CMS (1967)
  • VP/CSS (1968)
  • VM/370 (1972)
  • VM/BSE (BSEPP)
  • VM/SE (SEPP)
  • VM/SP (1980)
  • VM/XA MA (1984)
  • VM/XA SF (1985)
  • VM/XA SP (1988)
  • VM/ESA (1990)
  • z/VM (2000)
TPF line
  • ACP (1967)
  • TPF (1979)
  • z/TPF (2005)
UNIX and Unix-like
  • UTS (1981)
  • AIX/370 (1990)
  • AIX/ESA (1991)
  • MVS/ESA OpenEdition (1993)
  • OS/390 UNIX System Services (1996)
  • Linux (1999)
  • z/OS UNIX System Services (2001)
  • OpenSolaris (2008)

Read more about Compatible Time-Sharing System:  Overview, Characteristics, Implementation, Influences

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