By Harvey M Deitel; Barbara Deitel
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UNIVAC: The First Commercial Computer I n 1 946 Eckert and Mauchly left the University of Pennsylvania to form the Eckert-Mauchly Com- The Evolution of Compute rs The EN IAC The E NIAC occupied 1 500 square feet of floor space and weighed 30 tons. It consumed so much electricity that it actually dimmed the lights of the city of Philadelphia (it was kept at the University of Pennsylvania there) when it was turned on. The machine was completely electronic, consisting of 1 9,000 vacuum tubes and tens of thousands of other electronic components.
Mauchly of the University of Pennsylvania. From their dis cussions Mauchly devised his own ideas on how to build a better computer. He teamed up with J. , a graduate student, and to gether they built the first electronic general purpose computer, the ENIAC ( for Electronic Numerical Integrator and Computer). S. Army as the need for computing accurate ballistics tables increased [HE tHE 32 Introduction Figure 2 - 1 4 The Atanasoff-Berry Computer. during World War I I . (Unfortunately, it was not completed until 1 945, several months after the war ended.
Figure 2 -2 3 The advent of large-scale integrated circuitry ( LSI) with many thousands of transistors on a single silicon chip signaled the beginning of the fourth generation. In 1 970 IBM announced its System/370 to replace the 3 60s. The 370s used LSI technology, ran existing 360 programs, and replaced core memory with faster and cheaper metal oxide semiconductor (MOS) memories. At about this time the industry was "generation con· scious" and was being primed to expect the an nouncement of the fourth generation.
An introduction to information processing by Harvey M Deitel; Barbara Deitel