The system uses two semiconductor diodes and a capacitor to store each binary bit. At present the store consists of 64 words of 38 parallel bits, with a random-access cycle time at any selected address of 4 microsec.The design of the selection circuits will be described, including a reference to the use of transistors to produce voltage pulses of either polarity having well-defined amplitudes. Reference will be made to the sensing and writing circuits, and also to the selection of diodes for use in the storage elements. In addition, information on reliability gained during operation will be given.