[8] After securing a contract with DEFA (now known as DGA), SEA embarked on the development of its first stored-program computer in 1951, and likely France's first as well: the Calculatrice Universelle Binaire de l'Armement (CUBA).

Notably, the decision to utilize cutting-edge magnetic core memories instead of the more established Williams tubes or mercury delay lines proved risky, as no manufacturer in the still World War 2 recovering French industry was yet capable of producing them.

Additionally, an auxiliary drum memory was selected to complement the system, which SEA ultimately procured from the British company Ferranti due to the lack of a French manufacturer ready in time.

CAB stood for Calculatrice Automatique Binaire (Binary Automatic Calculator - the term "ordinateur", French for "computer", was coined only in 1955).

The mid-1950s then marked a turning point for SEA, as the company went on to develop two transistorized computers, constituting its two large-scale productions in this field.

In the same year, SEA invented the Symmag, a logic gate utilizing ferrite beads similar to those used in magnetic core memory.

[4] In collaboration with Crédit Lyonnais, the prototype named CABAN (Banking Calculator) was developed, placing emphasis on magnetic tape storage, offering higher capacity compared to punched cards.

[12] It operated at a fairly fast 2 MHz (in contrast, the IBM 1401 was clocked at 870 kHz), which enabled SEA to devise a bit-serial processor, which was less complex and costly while maintaining adequate performance for business applications.

[4] In 1964, SEA entered into a Memorandum of Understanding with Control Data Corporation (CDC), granting access to the technologies and peripherals of the emerging American supercomputer specialist.

[10] In the same year, IBM unveiled the 360 series, introducing a novel concept of both horizontal (application domains) and vertical (performance levels) compatibility within a unified family of computers.

This groundbreaking concept of compatibility and interoperability greatly interested SEA, prompting an exploration of a new generation of products built on these principles.

[15] The SEA primarily produced computers in small quantities, about a couple hundreds, and occasionally as one-of-a-kind units, most notably for military clients.