How does cmos rom memory work, why does it need battery power?

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by_EL2021-10-26 21:59:12

RAM

by_EL, 2021-10-26 21:59:12

The question is that if rom memory is not volatile memory like ram, then why is the cmos bios motherboard additionally powered by a battery, because this is rom volatile memory, why is there a battery? I don't understand
Thank you

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Tony, 2021-10-26
@AntonSazonov

The battery is needed in order for the clock (RTC) to run when the PC is turned off.
ROM - Read-Only Memory.
RAM stands for Random Access Memory.
There is nothing about energy independence in their names.
CMOS memory - https://ru.m.wikipedia.org/wiki/%D0%AD%D0%BD%D0%B5...
And CMOS is not Read-only.