How different units of computer communicate data, address etc. with each other?
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Depends on the component and the design of the computer. The fundamental that is shared by most computers is the use of digital electronic signals, but there are computers that use light instead of electricity for at least some part of their communication (not many, but numbers are slowly growing, there are computers that do analog signalling (not many, and the fraction has been shrinking for over 60 years, and there are bio-computers that link components in other ways (liquid solution; proto-neurons).
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