Download 15.Consumer Electronics by John G. Webster (Editor) PDF

By John G. Webster (Editor)

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A printed circuit board (PCB) forms the backbone of a calculator’s electronic circuit system, allowing various components to be attached and connected to each other (9). Figure 6 shows a calculator printed circuit assembly with many of the electronic components labeled. Wires that transmit data and instructions between the logic circuits, the memory circuits, and the other components are called buses. The printed circuit assembly starts out as a piece of high-temperature laminate polyimide or modified polyimide.

The keypad is an input device, since it is a way for the user to provide information to the calculator. The display is an output device, since it allows the calculator to convey information to the user. Early calculators, and today’s simple calculators, make do with only these input and output devices. But as more and more memory has been added to calculators, allowing for storage of more data and more extensive programs, the keypad and display have become bottlenecks. Various means have been developed to alleviate these bottlenecks.

N. R. Scott, Computer Number Systems and Arithmetic, Englewood Cliffs, NJ: Prentice-Hall, 1985. 14. T. M. Whitney, F. Rode, and C. C. Tung, The ‘powerful pocketful’: an electronic calculator challenges the slide rule, Hewlett-Packard Journal, pp. 2–9, 1972. 15. W. E. Egbert, Personal calculator algorithms I: square roots, Hewlett-Packard Journal, pp. 22–24, May 1977. 16. W. E. Egbert, Personal calculator algorithms II: trigonometric functions, Hewlett-Packard Journal, pp. 17–20, June 1977. 17. W.

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