It is an input and an output. The scanner scans the paper which is the input ,and the output is when the printer prints the paper.
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A modem modulates and demodulates electrical signals sent through phone lines, coaxial cables, or other types of wiring.
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A microprocessor is a computer processor where the data processing logic and control is included on a single integrated circuit. A computer need microprocessors to perform the functions of a computer's central processing unit.
