The Second Generation(1959-1963)

By early 1960,transistors and some other solid-state devices that were much smaller than vacuum tubes were being  used for much of the computers circuity.A transistor is an electronic switch that alternately allows or does not allow electronic signals to pass.Magnetic cores, which looked like very small metal washers of the main memory.Removable magnetic disk packs, stack of disk connected by a common spindle ,were introduced as storage devices. Second generation machines tended to be smaller,  more reliable, and significantly faster than first generation computers.

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