IBM 608
World's first marketed all-transistorized calculator / From Wikipedia, the free encyclopedia
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The IBM 608 Transistor Calculator, a plugboard-programmable unit, was the first IBM product to use transistor circuits without any vacuum tubes and is believed to be the world's first all-transistorized calculator to be manufactured for the commercial market.[1][2]:ā34ā Announced in April 1955,[3][4] it was released in December 1957. The 608 was withdrawn from marketing in April 1959.[3]