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Which the oldest calculator than it uses interchangeable rom?

April 26, 2017calculator oldest ROM uses

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Which the oldest calculator than it uses interchangeable rom?

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Is Sharp PC-1002 the oldest calculator than it uses interchangeable rom? “Most novel among recent calculator developments is the AC-powered desk-top PC-1002 from Sharp Electronics Corp., Paramus, N.J. Intended for engineering applications, this Japanese-made machine performs 15 scientific functions. In addition, this calculator offers up to four individual programs or a total of 256 steps which are controlled by four special keys (A, B, C, D). A plug-in programmable read-only memory (PROM) module contains the commands. When installed, the PROM becomes part of the calculator’s hardwired system. With different PROMs, the functions of the special keys are changed, converting the calculator to user-specified applications. Standard chips are now available for statistics, mathematics, metric conversion, and surveying. Additional chips covering structural engineering, electrical engineering, finance, and other fields are currently in preparation. Apart from the PROM function, the PC-1002 can