Convergent Technologies Operating System

Convergent Technologies Operating System (CTOS)
A Burroughs B25 computer running CTOS
DeveloperConvergent Technologies
Written inPL/M
Working stateDiscontinued
Initial release1980 (1980)
Supported platformsx86
Kernel typeMicrokernel
LicenseProprietary

The Convergent Technologies Operating System, also known variously as CTOS, BTOS and STARSYS, is a discontinued modular, message-passing, multiprocess-based operating system. It was sold by Convergent Technologies, and from 1988, when they acquired Convergent, by Unisys.

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