The Unix Pestilence Unix-Hater's handbook by Simson Garfinkel, Daniel Weise, Steven Strassmann, Don Hopkins. 1994(ахтунг! 3,5 мб пдф!)
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At first, Thompson used Bell Labs’ GE645 to cross-compile the Space
Travel program for the PDP-7. But soon—rationalizing that it would be
faster to write an operating system for the PDP-7 than developing Space
War on the comfortable environment of the GE645—Thompson had written
an assembler, file system, and minimal kernel for the PDP-7.
All to
play Space Travel. Thus Unix was brewed.