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for an unbuilt, undesigned 24-bit design.;PDP-3: The first 36-bit machine designed by DEC, advertised to customers but never built by Digital. Architecturally it was essentially a 36-bit extension of the PDP-1 with index registers: the PDP-3's 1960 preliminary specification describes the PDP-1 as "the 18 bit version of PDP-3" When the USAF's Air Force Cambridge Research Laboratories attempted to order a PDP-3 in the early 1960s (for speech

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