Atanasoff-Berry computer
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He spent the next year working out the details of its central computing apparatus: vacuum tube add-subtract mechanisms, rotating drum memory, and vacuum tube regeneration mechanisms to refresh the memory's capacitor elements. He and Berry completed a successful model of that central apparatus by December 1939, and the computer itself by May 1942.
[1] A. Mackintosh. Dr. Atanasoff's computer. , 1988, Scientific American.
[2] Alice R. Burks. The first electronic computer , 1988 .