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Binary-coded decimal — In computing and electronic systems, binary coded decimal (BCD) is a digital encoding method for numbers using decimal notation, with each decimal digit represented by its own binary sequence. In BCD, a numeral is usually represented by four bits … Wikipedia
IBM 1620 — The IBM 1620 was announced by IBM on October 21, 1959 and marketed as an inexpensive scientific computer . After a total production of about two thousand machines, it was withdrawn on November 19, 1970. Modified versions of the 1620 were used as… … Wikipedia

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