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Oi Electric Aleph-Zero Desktop Calculator

Photo taken at offices of Oi Electric in Japan

Desktop electronic calculator utilizing approximately 1700 Parametron ferromagnetic devices as logic elements. Parametron devices were compact and reliable, but required much more power than transistors. Total power consumption for the Aleph Zero was around 300 Watts, roughly four times the power draw of later transistorized calculators of similar capability. Four function plus one-key automatic square root and summation function. Full automatic floating decimal. One memory register. Utilizes Nixie Tube display elements.

The Aleph Zero may likely have been the first Japanese-made all-electronic calculator that was in regular production. It definitely preceded Sharp's Compet 10 to market. Though the Aleph Zero was advanced for its time, at around the same time, Mathatronics in the US was debuting its Mathatron calculators, which were by far the most advanced electronic calculators to date, and held that position until late 1965, when Olivetti in Italy introduced the famous Programma 101.