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Why are ROMs called non-volatile memory?

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Why are ROMs called non-volatile memory?

(a) They lose memory when power is removed

(b) They do not lose memory when power is removed

(c) They lose memory when power is supplied

(d) They do not lose memory when power is supplied

This question was addressed to me in unit test.

The question is from Read Only Memory (ROM) in section Memory Devices of Digital Circuits

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Right answer is (b) They do not lose memory when power is removed

Easy explanation: Volatile memory stores data as long as it is powered. ROMs are called non-volatile memory because of they do not lose memory when power is removed.

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