Just about anything they could think of that stored data in some way.
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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.
First Generation computers were computers made out of Vaccum Tubes. They were soon rejected due to the extreme heat and electricity absorption.