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The CMOS used to be actually part of the same chip (an Motorola MC146818) that contained the real-time clock, and 14 of the 64 bytes of memory in this chip were the clock registers. Today's hardware emulates an MC146818, but the memory may actually be an EEPROM, so doing things like "clearing the CMOS" may not be possible on some modern laptops (removing the battery will only reset the clock) - typically a "reset password" or similar jumper is provided to clear any power on password, though.
– LawrenceC
Commented Jul 22, 2014 at 20:24

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