Read e-book online An introduction to information processing PDF

By Harvey M Deitel; Barbara Deitel

ISBN-10: 0122090055

ISBN-13: 9780122090059

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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.

Their near extinction came quickly-with the computer revolution of the 1 970s. Early Computing Devices The Abacus The h istory of the evolution of computers begins thousands of years ago with the abacus, the world's oldest known computing device. It was used by the Chinese as early as 600 B . C . and is sti ll in use today. The abacus is an instrument that uses beads, or counters, which represent the numerical unit of notation (units, tens, hundreds, thousands), at­ tached to wires or grooves on a frame.

If the Analytical Engine had been completed, it would have been the first completely auto­ 12. One of the most i mportant developments in matic, general-purpose computer. For his de­ the computer field in the twentieth century sign of the Analytical Engine, Babbage is was the stored program concept, proposed by remembered as the father of the computer. John von Neumann in 1 946. The EDSAC was the first stored program computer, com­ 6. Ada, Countess of Lovelace, is recognized by pleted by Maurice Wilkes in 1 949.

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

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