The steps of technological differences are called generations. In 1941 German had developed a computer named Z3 to design airplanes and missiles. In 1943 the made a computer named Colossus to break secret codes during World War II.
In 1944, an American Howard A. Aiken, Professor of Harvard University, made the first electromechanical computer, Mark I. it was about51 feet long and 8 feet high. It was a slow machine. Over 3Q00 electrical actuated switches were used to control its operations.
In 1946, ENIAC (Electronic Numerical Integrator and Computer) was made by Dr. John W. Mauchy collaborated with J. Presper Eckert, Jr. at the university of Pennsylvania. It was 1000 times faster than Mark I. It oãcupied 150O0 square feet of floor spacing and weighs 30 tons. The ENIAC could do 5000 additions per minute.
John Von Neumann designed the EDVAC (Electronic Discrete Variable Automatic Computer). The key element of the Von Neumann architecture was the central processing unit, which allowed all computer functions to be coordinated in binary form (0 & 1).
1951, UNIVAC-i (Universal Automatic Computer UNIVAC-i) built and Eckert for Remington Rand Corporation, and installed in the U.S.Census, became one of the first commercially available computers.
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