Sanyo ICC-810

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In May 1971, Sanyo launched its first pocket calculator, the ICC-804D, which contains four pieces of LSI integrated circuits developed in cooperation with General Instrument of United States. The miniaturization was made possible by small LED display, as well as the NiCd batteries (Cadnica) produced at Sanyo. The calculators sold for Y79,500, had an internal precision of 16 digits, of which 8 digits were visible on the display at the same time. Next, a slightly larger, more robust version equipped with NEC’s gas discharge display (ICC-807D), was completed, the price of which was only Y49,500. In 1972, these were followed by the ICC-810, whose major innovation was the calculator circuit implemented in a single LSI chip. It could handle only 8 digits and could only be used in floating point mode. In order to keep the batteries charged, the display was switched off after about half a minute of inactivity, which was indicated by the lighting of the HOLD lamp, and could be switched back by pressing the H key. The next version (CX-8102, according to new type designation) used algebraic logic, had the ability to calculate percentages, a fixed-point notation, and an accumulating memory.