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Computers consist of many chips placed on electronic boards called printed circuit boards .
There are different types of chips. Chips come in a variety of packages. Dual in-line packages are the traditional buglike chips that have anywhere from 8 to 40 legs, evenly divided in two rows. Pin-grid arrays are square chips in which the pins are arranged in concentric squares. Single in-line packages are chips that have just one row of legs in a straight line like a comb.