d only 23 commands. Not only was the main memory on magnetic drum, but so were the CPU registers, each on a dedicated track. The drum stored 2048 32-bit words. Input and output was by six level paper tape. The number of vacuum tubes was kept to a minimum by using solid-state diode logic wherever possible. The whole machine was the size of a large desk. To further reduce costs, the traditional rows of lights showing internal registers were absent. Instead, Librascope mounted a small oscilloscope on t
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