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 calculatrors under.
The calculator was developed by a team
led by Árpád Klatsmányi(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 calcultor is based on a
small magnetic core memory array.
The machine provides the four basic math functions, and supports chained
multiplication and division. The Hunor 131 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.
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.