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* Often a communications line could not be shared by terminals of different types, as they used different " dialects " of the existing communications protocols.
Up to the early 1970s, computer components were so expensive and bulky that it was not feasible to include all-purpose communications interface cards in terminals.
Every type of terminal had a hard-wired communications card which supported only the operation of one type of terminal without compatibility with other types of terminals on the same line.

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