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The PDP-4 was the successor to the Digital Equipment Corporation's PDP-1.

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Photograph of Exhibit of PDP-4 Digital Equipment Corporation Machines on the Stage of the National Archives Auditorium, 1964 (3874706978).jpg
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PDP-4

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The PDP-4 was the successor to the Digital Equipment Corporation's PDP-1.

==History== This 18-bit machine, first shipped in 1962, was a compromise: "with slower memory and different packaging" than the PDP-1, but priced at $65,000 - less than half the price of its predecessor. All later 18-bit PDP machines (7, 9 and 15) are based on a similar, but enlarged instruction set, more powerful than, but based on the same concepts as, the 12-bit PDP-5/PDP-8 series.

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