Abstract
The single memory system provided in the Stored Program Control (SPC) No. 1A is built around the piggyback twistor (PBT). Each SPC 1A store provides 770,048 bits of random-access nondestructive readout (NDRO), electronically alterable information organized into 16,384 words. The store has a read-cycle time of 6.3 μs. The paper describes in detail the memory medium, memory circuits, and equipment design. A general description is given of store operations and store diagnostic and maintenance procedures.
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