Triumph L817

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After thin VFD pocket calculators, Japanese manufacturers have produced various liquid crystal displays in series, all of which are made for interfacing a domestic chip. The first Triumph-Adler machines still had a look similar to the aluminum housings of the previous series, but the new ones launched in 1980 was dominated by black color. The calculators built with NEC's new, low-power circuits, could now be switched on with a pushbutton instead of the usual slide switch; so these equipments last for 3,500 hours of use. The green plastic case could also be used as a stand. In addition to the four arithmetic operations, the L815 is capable of calculating percentages, square roots, and changing the sign; L817 can provide reciprocal values and squares, display fixed point results; the two scientific types, LS825 and LS826, had more functions than before; the only difference between them was the display format selector button, which was only implemented on the LS826.

Two versions of the L817 are known: the earlier made with Optrex-made, the later with Sanyo-made LCD with matching PCB. The readout design of the displays is slightly different, unfortunately the Sanyo models are near the end of their life and in most cases are completely “blackened”. In addition, their NEC calculator circuits have non-volatile memory registers.