A transistor computer is a computer which uses discrete transistors instead of vacuum tubes. The "first generation" of electronic computers used vacuum tubes, which generated large amounts of heat, were bulky, and were unreliable. A "second generation" of computers, through the late 1950s and 1960s featured boards filled with individual transistors and magnetic memory cores. These machines remained the mainstream design into the late 1960s, when integrated circuits started appearing and led to the "third generation" machines.
Read more about Transistor Computer: The First Transistor Computer, The First Commercial Fully Transistorized Calculator, The First Commercial Fully Transistorized Large-scale Computer, Schools and Hobbyists, See Also
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“The Buddha, the Godhead, resides quite as comfortably in the circuits of a digital computer or the gears of a cycle transmission as he does at the top of a mountain or in the petals of a flower.”
—Robert M. Pirsig (b. 1928)