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The ABC was built by Atanasoff and Berry in the basement of the physics building at Iowa State College during 1939–1942. The initial funds were released in September, and the 11-tube prototype was first demonstrated in October 1939.

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Colossus was a set of computers developed by British codebreakers in the years 1943–1945 to help in the cryptanalysis of the Lorenz cipher. Colossus used thermionic valves (vacuum tubes) to perform Boolean and counting operations.

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1944-Mark I completed to compute ballistics tables

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1944-Mark I completed to compute ballistics tables

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Harvard Mark I, an early proto computer, built during World War ll in the United States.

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ENIAC, in full Electronic Numerical Integrator and Computer, the first programmable general-purpose electronic digital computer, built during World War ll by the United States. It was built by American physicist John Mauchly American engineer J. Presper Eckert Jr., and their colleagues at the Moore School of Electrical Engineering at the University of Pennsylvania

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On June 14, 1951, the U.S. Census Bureau dedicates UNIVAC, the world's first commercially produced electronic digital computer. UNIVAC, which stood for Universal Automatic Computer, was developed by J. Presper Eckert and John Mauchly, makers of ENIAC, the first general-purpose electronic digital computer.