Information Research Services Updated: 29 April 1998
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        Dennis Richie and Ken Thompson's design of the first version of UNIX on a PDP-7 marked the beginning of a long relationship between DIGITAL and UNIX that continues to the present. In the early 1970s UNIX was ported to a PDP-11 and in 1983, DIGITAL developed ULTRIX, its own version of the popular operating system. Here, Richie and Thompson work at a PDP-11.
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