June 21, 1948: Manchester Small-Scale Experimental Machine Runs First Program
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1948 – What was first expected to be a practical use computer, the SSEM, or Small-Scale Experimental Machine became the first stored-program computer. Basically, it stores program instructions into it’s electronic memory. This 32-bit word length, cathode-ray tube computer was designed to only run subtraction and negation through hardware. Other functions could be run, but only through software.
The first program was run on this day. It was written by Professor Tom Kilbum. The seventeen-instruction stored-program took 52 minutes to run. The program was tasked to find the highest proper factor of 218 (262,144).
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