vaccum tubes and valves.
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Discrete components. Most components were the same as in first generation computers, but vacuum tubes were replaced with transistors. Operating voltages were correspondingly reduced and circuits sped up as a result.
Because the first, second, and third generation computers were also digital computers.
Electro-Mechanical Computers were used before first generation of computers.
no, first generation computers used vacuum tubes.
The speed of computers increased from one generation to the next generation, and to the next generation, and so on.