Hi there
Here is the easy one, but sometimes it confuses me.  What type of information does BIOS keep and What type of information does CMOS keep.  Please I need to understand it.  Try to explain in easier way, so that a learner like me can understand it.
amanzoorNetwork infrastructure AdminAsked:
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In short:
BIOS contains all the code required to control the keyboard, display screen, disk drives, serial communications, and a number of miscellaneous functions.
CMOS hols date, time, and system setup parameters.


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I like to think of it this way:

BIOS is the software used for configuring your machine. It stores your settings in the CMOS.
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> BIOS is the software used for configuring your machine. It stores your settings in the CMOS
Well, BOIS (Basic Input Output System) is software. But you can't configure it since it is in EPROM.
CMOS is the place you config the setting for BIOS.

That's like saying I can't configure my VCR because its program is in ROM. And that would be a silly thing to say.
Well, I don't know what do you mean.
Anyway, you can program BIOS, such BIOS upgrade. When the system boot up, BIOS read the configuration
from CMOS (if not available, then BOIS itself has default configuration).
That's the defference between BIOS and CMOS.

I don't know the configuration of VCR, but I know I will lose my setting when I put out the power core.
So I think the setting is stored in RAM.

The same thing, CMOS will lose its setting (or configuration) when you take out the battery on motherboard.
But BIOS won't lose its setting while the battery is out since it is hard-coded in EPROM.
Configure BIOS? I rather call "program BIOS".


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