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EMG Hunor calculator family
The management of the Development Group of the Electronic Measuring Devices Factory ( EMG ) clearly understood that workplaces with high computing demands needed electronic calculators that could operate on demand. Therefore, in the first half of the 1960s, it launched the Hunor program, within the framework of which 16 electronic calculator models were developed, including the Hunor 131, which achieved great economic success (picture).
Own development to meet increased domestic needs
Use
- Daily work in corporate offices
- Detailed design calculations in engineering design offices
There is no specific data, but it was sold in large numbers: the revenues generated nearly half of the factory's annual profit.
Structure
The 13-digit arithmetic unit of the Hunor-131 calculator was built using transistor circuits using EDS logic elements.
Its control panel had 11 numeric and 11 action keys, and the results could be read on numerical display Nixie tubes.
The overflow was indicated by a sound and light signal.
The machine could be connected to 6 different keyboard layouts (of course, only one at a time).
Its improved versions (Hunor 157, Hunor 158) could handle four workstations.
The necessary power supply voltages were generated from a 220 Volt alternating current network; its consumption was 95 Watts.
Operation
In addition to the 4 basic mathematical operations (addition, subtraction, multiplication, division), exponentiation and any combination of these could be performed with numbers entered from the keyboard, while adhering to precedence rules.
The entered number and the result were displayed by 13 number display tubes and (for the decimal point) the same number of small glow lamps.
By storing the current result, it was also possible to perform cumulative operations.
Program set
It was not programmable.
There were no
Historical curiosities
The Hunor-131 calculator contained 393 transistors and 1766 diodes; it was mass-produced with a cycle time of 30 minutes.
The different keyboards were used for economical reasons to increase the application possibilities, since the price of a machine was relatively high.
The later (1978) "grandchildren" (Hunor 121, 121B) were made with Texas Instruments and National Semiconductors calculator ICs, with the following options:
- adjustable decimal precision (0,1,2,4,8)
- constant switch
- go back to the number before the operation
- delete entered digits one by one
- built-in storage
A printer could now be connected to the Hunor 126.
The Hunor 131, which also received a design award, was the first domestic product to appear on the world market.
Image gallery: EMG products
Resources
More detailed data: Hunor-131 and its descendants
The “family members”: Hunor calculators
Interesting fact: EMG story
Created: 2016.07.24. 20:03
Last modified: 2021.02.13. 18:59