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Coherent (operating system)
The Coherent operating system was introduced in 1983 by the now-defunct Mark Williams Company as one of the first Unix-like systems for IBM PC-compatible computers. Coherent was capable of running on most Intel-based PCs with 286, 386, and 486 processors and, like a true Unix, was capable of multitasking and of having multiple users. Coherent also had support for X11.
Coherent is sometimes mistakenly referred to as "Coherent Unix", which is incorrect. Coherent was based on the specifications of Unix Version 7, without reference to any of the Unix source code, either from Bell Labs or BSD.
Much of the operating system was written by ex-students from the University of Waterloo: Dave Conroy , Randall Howard , and Johann George .
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