View source for Multiple Console Time Sharing System

{{Infobox OS
| name                   = GM Multiple Console Time Sharing System (MCTS)
| logo                   = 
| screenshot             = 
| caption                = 
| website                = 
| developer              = [[General Motors Research Laboratories]]
| family                 = [[Multics]]
| source model           = 
| released               = 1970s
| latest release version = 
| latest release date    = 
| preceded_by            = 
| succeeded_by           = 
| latest preview version = 
| latest preview date    = 
| frequently updated     = 
| marketing target       = 
| language               = [[English language|English]]
| kernel type            = N/A
| userland               = 
| ui                     = [[Command-line interface]]
| license                = none
| working state          = Historic
| supported platforms    = [[Control Data Corporation]] [[CDC STAR-100|STAR-100]]
| updatemodel            = 
| package manager        = 
}}
The '''Multiple Console Time Sharing System''' (MCTS) was an [[operating system]] developed by [[General Motors Research Laboratories]] in the 1970s for the [[Control Data Corporation]] [[CDC STAR-100|STAR-100]] supercomputer.  MCTS was built to support GM's [[computer-aided design]] (CAD) applications.<ref>{{cite journal |last1=Elshoff |first1=James L. |last2=Ward |first2=Mitchel R. |title=The MCTS operating system |journal=ACM SIGOPS Operating Systems Review |volume=10 |issue=1 |date=January 1976 |pages=18–38 |doi=10.1145/775314.775317 |doi-access=free}}</ref>

MCTS was designed starting in 1968. It was written in a high-level [[systems programming language]] "Malus", a dialect of [[PL/I]]. A superset of Malus called [[Apple (programming language)|Apple]] became the primary application language.<ref name=SIGOPS>{{cite journal |last1=Brown |first1=R.R |last2=Elshoff |first2=J.L. |last3=Ward |first3=M.R. |title=The GM Multiple Console Time Sharing System |journal=ACM SIGOPS Operating Systems Review |date=1 Oct 1975 |volume=9 |issue=4 |pages=7–17 |doi=10.1145/775310.7753 |doi-broken-date=2024-07-05 |url= https://dl.acm.org/doi/10.1145/775310.775311|access-date=July 1, 2024}}</ref>

MCTS was based on [[Multics]].<ref name=o54>''Krull'', pg. 54</ref> All access to data was thru the [[virtual memory]] system. Only the system paging support module was concerned about the physical location of the data.<ref name=SIGOPS />

==See also==
*[[GM-NAA I/O]]
*[[SHARE Operating System]]
*[[Timeline of operating systems]]

==References==
{{Reflist}}

==Further reading==
* {{cite journal |url=https://courses.cs.washington.edu/courses/cse490h1/19wi/resources/gm-origins.pdf |first=F.N. |last=Krull |title=The origin of computer graphics within General Motors |journal=[[IEEE Annals of the History of Computing]] |publisher=[[IEEE]] |volume=16 |issue=3 |date=Fall 1994 |pages=40–56 |doi=10.1109/MAHC.1994.298419}}

{{Supercomputer operating systems}}
{{Time-sharing operating systems}}
{{Multics}}

[[Category:Discontinued operating systems]]
[[Category:Multics-like]]
[[Category:Proprietary operating systems]]
[[Category:Time-sharing operating systems]]
[[Category:Supercomputer operating systems]]

{{Operating-system-stub}}