L’UNIVAC I est le premier ordinateur commercial réalisé aux États-Unis. Il a été créé par J. Presper Eckert et John Mauchly, déjà à l’origine de l’ENIAC. Avant que d’autres machines ne sortent dans la même série, l’UNIVAC I était tout simplement appelé UNIVAC.
Le premier ordinateur est livré à l’United States Census Bureau le 30 mars 1951 et mis en service le 14 juin. Le cinquième (construit pour l’Atomic Energy Commission) a été utilisé par CBS pour prédire l’issue de l’élection présidentielle de 1952. A partir d’un échantillon d’un pour cent des votants il prédit qu’Eisenhower aurait été élu président, chose que personne n’aurait pu croire, mais UNIVAC avait vu juste.
Les ordinateurs étaient fabriqués par Univac, une filiale de Remington Rand.
UNIVAC I utilise 5200 tubes à vide, et pèse 13 tonnes.
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