Explain the most used alphanumeric code before Unicode. ?

Explain the most used alphanumeric code before Unicode. ?
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Answer :

The most used alphanumeric code before Unicode is ASCII code. The American Standard Code for Information Interchange stands for ASCII or ASCII. In 1975, Robert Beamer invented the seven-bit ASCII code. ASCII is a very common code , consisting of 6 bits. This code can be used to specify 2 or 256 unique symbols. Currently ASCII-8 refers to ASCII code.
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