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The CMOS Chip

By Peppermill ·
I understand that when configuring a computer, the configuration is stored in the CMOS Chip. I also understand that this is the same chip that holds the Real Time Clock. When one saves the cmputers configuration, Where does it fisically save it? In a special chip? If it is a chip, Can someone tell me where I should find it on the motherboard?

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The CMOS Chip

by TheChas In reply to The CMOS Chip

First, CMOS is actually a specific integrated circuit design technology, many of the IC's on the motherboard are CMOS devices.

The BIOS settings and RTC data are stored in a CMOS RAM memory IC.
CMOS technology is used because it draws very little current when it operates, thus maximizing the back-up battery life.

Many companies combine the RTC and CMOS memory in a single IC.
Some companies have even included the memory, clock, oscillator, and battery in a single package.

The locationvaries by motherboard, but the CMOS RAM is usually near the BIOS flash memory IC.

On a modern motherboard, this will be a surface mount, or BGA device that cannot be changed by the average user. (or technician for that matter) As special soldering equipment is required to change the IC.

In order to verify which IC is the CMOS memory/RTC, you need to either search the IC manufactures, checking each IC part number.
Or, obtain a service manual for the motherboard.

Chas

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The CMOS Chip

by Peppermill In reply to The CMOS Chip

My Gratitude to The Chas, I looked all over for this answer and only got a hint that it was the way that was explained. Now I can take it from here and accomplish my repair job. Thanks again.

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The CMOS Chip

by Miroslavvv In reply to The CMOS Chip

For detailed info go on
http://www.computerbits.com/archive/2002/0300/biosandcmos.html
...or
http://www.sysopt.com/biosdef.html

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The CMOS Chip

by Peppermill In reply to The CMOS Chip

Yes, I went to their website and it helped, Thanks

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The CMOS Chip

by Peppermill In reply to The CMOS Chip

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