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The Coherent Operating System

The Coherent operating system was a Unix Version 7 written by a company called Mark Williams Company. It was originally produced for the PDP-11 in 1980. A port was introduced in 1983 as the first Unix-like system for IBM PC compatible computers. Coherent was able to run on most Intel-based PCs with Intel 8088, 286, 386, and 486 processors. Coherent version 3 for Intel-based PCs required at least a 286, Coherent version 4 for Intel-based PCs required at least a 386.

Like a true Unix, Coherent was able to multitask and support multiple users.