Information Research Services Updated: 28 April 1998
          Oops! Here's the right answer.
        From a technical bulletin on the PDP-1 (Programmed Data Processor), dated March 1960: "...a compact, solid state general purpose computer with an internal instruction execution rate of 100,000 to 200,000 operations per second. PDP-1 is a single address, single construction, stored program machine with a word length of 18-bits operating in parallel on 1's complement binary numbers."
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