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PDP-11 Possibly the single most successful minicomputer design in history, a
favorite of hackers for many years, and the first major Unix machine, The
first PDP-11s (the 11/15 and 11/20) shipped in 1970 from
DEC; the last (11/93 and 11/94) in 1990. Along the
way, the 11 gave birth to the VAX, strongly
influenced the design of microprocessors such as the Motorola 6800 and
Intel 386, and left a permanent imprint on the C language (which has an odd
preference for octal embedded in its syntax because of the way PDP-11
machine instructions were formatted). There is a history site.
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