The MC-24 is a series of electric calculating machines, automatic, with integrated print and register memory, produced by the Italian Olivetti, starting from 1956. The mechanism was designed by Natale Capellaro, while the body is due to Marcello Nizzoli. The most popular model and sold (they produced 6 million units), the Divisumma 24 as well as a revolution in the field of automatic computers has also become an icon of industrial design Italian.

The series consisted of three basic models: the Multisumma-24 (addition, subtraction and multiplication), the Divisumma-24, and Tetractys that, equipped with a dual totalizer and a number of additional features, represented the worldwide state of the art of mechanical calculation of those years.

A prototype of the Tetractys was presented at the Milan Fair in 1955 and the complete machine was available to purchase the following year. They were in production until 1966.

Manufacturer: Olivetti
Date: 1958

This exhibit has a reference ID of CH33152. Please quote this reference ID in any communication with the Centre for Computing History.

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