IBM completes development of large scale digital computer

The selective sequence electronic calculator recently completed by the International Business Machines Corporation, New York, N. Y., is a general purpose machine which combines electronic speed, vast memory capacity, and high flexibility. Memory capacity, an inherent limitation for large scale computer, is supplied by three methods. Eccles-Jordan circuits are used in the electronic memory unit to provide storage of 160 decimal digits. An additional 3,000 decimal digits are immediately available in the relay memory unit. The remainder of the 400,000-digit storage capacity is supplied by punched tapes.