Editing Conversational Monitor System (section)

{{Short description|Operating system}}
{{main|VM (operating system)|CP/CMS|History of CP/CMS}}
{{More footnotes needed|date=September 2023}}
{{Infobox OS
| name                   = Conversational Monitor System (CMS)
| logo                   = IBM logo.svg
| logo caption           = 
| logo size              = 120px
| logo alt               = 
| screenshot             = 
| caption                = 
| developer              = [[IBM]]
| family                 = 
| working_state          = 
| source_model           = 
| released               = {{Start date and age|1967}}
| latest_release_version = 
| latest_release_date    = 
| latest_preview_version = 
| latest_preview_date    = 
| frequently_updated     = 
| repo                   = 
| marketing_target       = 
| programmed_in          = 
| language               = <!-- number of human languages supported (English, French, Italian, Arabic, ...) -->
| prog_language          = 
| updatemodel            = <!-- APT, Windows Update -->
| package_manager        = <!-- dpkg, rpm, Windows installer -->
| supported_platforms    = [[IBM CP-40]]
| kernel_type            = 
| userland               = 
| influenced_by          = [[Compatible Time-Sharing System]]
| ui                     = 
| license                = 
| preceded_by            = 
| succeeded_by           = 
| website                = 
}}
{{History of IBM mainframe operating systems|vm}}
The '''Conversational Monitor System''' ('''CMS''', originally '''Cambridge Monitor System''')<ref>{{cite book  
|title=Control Program-67/Cambridge Monitor System (GH20-0857-1) |publisher=IBM |date=October 1971}}</ref> is a simple [[interactive computing|interactive]] single-user [[operating system]].  CMS was originally developed as part of IBM's [[CP/CMS]] operating system, which went into production use in 1967.  CMS is part of IBM's [[VM (operating system)|VM family]], which runs on [[IBM mainframe]] computers. VM was first announced in 1972, and is still in use today as [[z/VM]].

CMS runs as a "guest" operating system in a private [[virtual machine]] created by the [[VM (operating system)|VM]]  ''control program''. The control program plus CMS together create a multi-user time-sharing operating system.