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Hunor 131 Desktop Calculator

The Hunor 131 is the first electronic calculator manufactured in socialist Hungary, introduced in 1965. Hunor was the brand name adopted by the manufacturer to market its electronic calculators. The calculator was developed by a team led by Klatsmányi Árpád (12/20/1923-7/1/2007), famed Budapest-born engineer, working for the Hungarian engineering factory Elektronikus Mérőkészülékek Gyára(EMG), (Electronics Measurement Equipment Works). Development was begun in October of 1964, and the machine was in full production by fall of 1965 - an incredibly short development timeframe for any electronic calculator.

The calculator's logic is fully transistorized, using transistors developed and manufactured within Hungary. The register storage (three working registers) of the calculator is based on a small magnetic core memory array.

The Hunor 131 provides the four basic math functions, and supports chained multiplication and division. The calculator has a capacity of 13 digits, using top-view Nixie tubes for the display. The machine has fully-floating decimal, with the decimal point indicated by discrete neon tubes situated between the Nixie tubes. Numeric overflow lights an indicator and sounds a tone, with the keyboard electronically disabled until the machine is cleared.

The calculator supports remote operation by connection of remote keyboards (up to six) to the calculator through a cable connection, however, the remote keyboards do not have display capability, rather limiting their usefulness. Only one remote keyboard could operate the calculator at a time.

The museum is looking for anything relating to this calculator, including the calculator itself in working or non-working condition, parts, remote keyboard units, and documentation/literature. Please contact the museum by clicking the EMail button in the toolbar at the top of this page.