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Starting with the Datapoint 3300 in 1969, by the late 1970s and early 1980s, there were dozens of manufacturers of terminals, including Lear-Siegler , ADDS , Data General , DEC , Hazeltine Corporation , Heath/Zenith , Hewlett Packard , IBM , Televideo , Volker-Craig, and Wyse , many of which had incompatible command sequences (although many used the early ADM-3 as a starting point). The great variations in the control codes between makers gave rise to software that...