ELWRO 120L Calculator

General description

The ELWRO 120L holds a significant place in the history of Polish technological advancement, particularly in the realm of electronic calculators. Developed in the 1970s by ELWRO, a renowned Polish company, this calculator represented a leap forward in computation technology during its time.
  1. Simple Design:
    The ELWRO 120L boasted a straightforward yet robust design, featuring the essential four arithmetic functions: addition, subtraction, multiplication, and division. Its simplicity in design belied its capability to perform basic mathematical calculations efficiently, catering to various computational needs.

  2. Integration of Progressive Technology:
    Powered by a single integrated circuit chip CEMI MCX74204 , the ELWRO 120L exemplified the integration of state-of-the-art technology into compact devices. This innovation allowed for the mass production of calculators, making them more accessible to a broader audience.

  3. 220V Power Supply:
    One distinguishing feature of the ELWRO 120L was its compatibility with a 220V power supply, aligning with the electrical standards prevalent in Poland and many European countries. This ensured seamless integration into everyday environments, from homes to offices and educational institutions.

  4. Educational and Professional Utility:
    The ELWRO 120L found widespread use in educational settings, aiding students in learning fundamental mathematical concepts and principles. Its reliability and simplicity also made it a valuable tool for professionals in various fields, facilitating quick calculations in their day-to-day tasks.

  5. Enduring Legacy:
    While modern computing technology has far surpassed the capabilities of early calculators like the ELWRO 120L, its legacy endures as a symbol of Poland’s technological prowess and innovation. For those who used it during its prime, the ELWRO 120L evokes nostalgia and serves as a testament to the rapid evolution of computing devices.

In conclusion, the ELWRO 120L calculator stands as a testament to Poland’s contributions to the technological innovation.

Internal structure

The ELWRO 120L calculator is based on a Polish-made CEMI MCX74204 integrated circuit, representing an initial attempt at producing „calculator on chip” circuits.
This integrated circuit is very rare and practically only occurs in this calculator.

Video showing the operation of the ELWRO 120L calculator and its internal structure.

You can watch my other videos on vintage computer technology on my YouTube channel: https://www.youtube.com/@Oldics-com