page_title: Convergent Technologies Operating System
hierarchical_section_title: Convergent Technologies Operating System
caption_attribution_description: A Burroughs B25 computer running CTOS.
context_page_description: The Convergent Technologies Operating System, also known variously as CTOS, BTOS and STARSYS, was a modular, message-passing, multiprocess-based operating system.
context_section_description: The Convergent Technologies Operating System, also known variously as CTOS, BTOS and STARSYS, was a modular, message-passing, multiprocess-based operating system.
caption: A Burroughs B25 computer running CTOS
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