SANTIAGO, Chile  When military forces loyal to Gen. Augusto Pinochet staged a coup here in September 1973, they made a surprising discovery. Salvador Allende’s Socialist government had quietly embarked on a novel experiment to manage Chile’s economy using a clunky mainframe computer and a network of telex machines.

The project, called Cybersyn, was the brainchild of A. Stafford Beer, a visionary Briton who employed his “cybernetic” concepts to help Mr. Allende find an alternative to the planned economies of Cuba and the Soviet Union. After the coup it became the subject of intense military scrutiny.

In developing Cybersyn, Mr. Beer changed the lives of the bright young Chileans he worked with here. Some 35 years later, this little-known feature of Mr. Allende’s abortive Socialist transformation was remembered in an exhibit in a museum beneath La Moneda, the presidential palace.

A Star Trek-like chair with controls in the armrests was a replica of those in a prototype operations room. Mr. Beer planned for the room to receive computer reports based on data flowing from telex machines connected to factories up and down this 2,700-mile-long country. Managers were to sit in seven of the contoured chairs and make critical decisions about the reports displayed on projection screens.