Download e-book for iPad: An introduction to information processing by Harvey M Deitel; Barbara Deitel

By Harvey M Deitel; Barbara Deitel

ISBN-10: 0122090055

ISBN-13: 9780122090059

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Mauchly and Eckert 6. Jay W. Forrester 7. Herman Hollerith 8. Ada Lovelace 9. John von Neumann 10. Thomas J. Watson, Sr. A. B. C. D. E. F. G. H. I. J. First punched card tabulating machines Magnetic core memory Mathematics of true/false variables First computer programmer Founded IBM Stored program concept ABC Harvard Mark I ENIAC Analytical Engine The Evolution o f Computers 43 Fill-in-the-Blanks Fill in the blanks in each of the following: 1. The slide rule was made extinct by the ___ . 2. Many important nineteenth-century computing developments were inspired by the success of in the Jacquard loom.

That census took only two and a half years to complete. A punching de­ vice ( Figure 2 - 1 2) was used to record facts about individuals by punching holes in specific locations on the cards. The tabulating machine (Figure 2 - 1 3 ) then pressed pins against the cards. When a pin passed through a hole, the pin went into a jar of mercury. This completed an electrical cir­ cuit that caused a simple mechanical counter to be increased by one. Right: Hollerith's punched-card tabulating ma­ chine. Devices like this were used in the census of 1 8 90.

They were smaller, more reliable, used less energy, and gave off very little heat. In addition, computers with transistors operated much faster than those with vacuum tubes. By 1 95 9 computer systems were delivered featuring the complete re­ placement of vacuum tubes with transistors. First generation computers were dedicated systems, that is, only one person at a time could use the machine. Designers of second generation systems realized that much better utilization could be achieved by allowing several users to share the machine jointly.

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An introduction to information processing by Harvey M Deitel; Barbara Deitel

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