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I read:

NVRAM is the updated Mac terminology for PRAM and is short for Non-Volatile RAM.

Plus, I know that there are 2 types of main memory RAM and ROM while the first is Volatile the second isn't.

So, my question is, why it was called NVRAM/PRAM and not NVROM/PROM?

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    $\begingroup$ To my understanding (and I don't really know a lot about this kind of things), ROM is "Read Only Memory" (for storing BIOS programs for example) while RAM is general purpose (it can be written and read from). So a non-volatile RAM isn't quite a ROM $\endgroup$
    – nir shahar
    Jan 12 at 23:35

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