In the early 1960s, IBM marketed the IBM 7740 Communication Control System and the IBM 7750 Programmed Transmission Control, which were programmable message switching systems.
A principios da década de 1960, IBM comercializou o Sistema de control de comunicacións IBM 7740 e o Control de transmisión programado IBM 7750, que eran sistemas de conmutación de mensaxes programables.