The CAB 500 (Calculatrice Automatique Binaire 500, or Binary Automatic Calculator 500) was a transistorized computer using drum memory designed between 1957-1959 by Société d'Electronique et d'Automatisme (SEA) and manufactured in about a hundred units, with the first one delivered in 1961.

A remarkable aspect of this machine for its time is that it did not require any special setup such as air conditioning, and could be connected to a standard 220-volt three-phase power supply.

This straightforward installation was complemented by its relatively low cost, made possible by its technology built around SYMMAG 200 magnetic logic elements and mass production.

[5] The CAB 500 was equipped with a magnetic drum capable of storing over 16K 32-bit words, representing about 16,000 ten-digit numbers, which enabled the execution of complex calculations, detailed statistical analyses, or extensive administrative management tasks.

[3] In terms of applications, the CAB 500 could solve linear systems with over 60 unknowns, invert matrices of more than 60 orders, and handle operations research problems with a substantial number of variables.