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By Harvey M Deitel; Barbara Deitel

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How quickly can they exchange information among themselves? Why is storing computer data considered "the pits? " How have space satellites changed the picture of commu­ nications? Can computers take a poll? Can they con­ centrate? What are those marvelous devices called microchips? How are they made? Why are so many of them thrown away rather than fixed? " Can we build living computers (fleshware)? Do computers like bars? Can they process garbage? Can they load bullets? How are lasers changing the world of computers and commu­ nications?

These circuits are designed with the help of CAD/CAM (computer­ aided design/computer-aided manufacturing) de­ vices (Figure 4; see Chapter 5). These computer systems help the designer produce complex circuit patterns more quickly and accurately than would be possible man ually. When the design is complete, the computer system contains a detailed descrip­ tion of the circuit. The computer then automatically prepares a large photomask containing the circuit pattern for one layer of the chip (Figure 5).

The computer then performs vari­ ous calculations in its processing unit and presents the results of these calculations to the user via an output unit, such as a printer or video screen. The example i n the figure shows a simple payroll application. The user types in an employee's name and hourly salary and then enters the number of hours the employee worked each day. The com­ puter then calcu l ates the sum of these daily fig- The Processor 49 ENTER HOURS MONDAY 7 8 TUESDAY > B WEDNESDAY > 8 THURSDAY ?

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