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The first practical form of Random Access Memory was the __________

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The first practical form of Random Access Memory was the __________

(a) SSEM

(b) Cathode Ray Tube

(c) William’s Tube

(d) Thomas’s Tube

This question was posed to me during an internship interview.

I would like to ask this question from The Storage Unit topic in section Basic Computer Organisation of Computer Fundamentals

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Right answer is (c) William’s Tube

Easy explanation: The first practical form of RAM was William’s Tube made in 1947. It stored data as electrically charged spots on the face of a Cathode Ray Tube.

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