EDVAC goes online
This machine could do things no other could. Through electrical states, the properties of mercury, and the ability to store 2 different states (1 or 0 which would signify either on or off) - EDVAC achieved something no other device had to date achieved.
Memory. It could not only calculate, but it could 'remember' and compute results based on various variables entered. In August 1949, the first computer with a "Stored Program" went on-line.
Work on this computer actually began in 1945, 2 years before the ENIAC computer went operational.
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