Convergent Technologies Operating System

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Convergent Technologies Operating System (CTOS)

A Burroughs B25 computer running CTOS
Developer	Convergent Technologies
Written in	PL/M
Working state	Discontinued
Initial release	1980; 45 years ago (1980)
Platforms	x86
Kernel type	Microkernel
License	Proprietary

The Convergent Technologies Operating System, also known variously as CTOS, BTOS and STARSYS, is a discontinued modular, message-passing, multiprocess-based operating system.