Archived from groups: alt.sys.pc-clone.dell (
More info?)
<ben_myers_spam_me_not @ charter.net (Ben Myers)> wrote in message
news:42b20049.2348710@nntp.charter.net...
> Nope. The battery is also responsible for keeping the CMOS settings from
> becoming corrupted.
I agree that the older systems needed a battery to maintain their settings.
[We still have a 486 in the lobby that needs to have the BIOS settings
entered every time it's booted (I soldered a new battery in it twice and it
olny lasts a week so ......)]; but I was talking about EEPROM, not PROM or
EPROM systems.
"While Random Access Memory (RAM) loses its data every time you power down
your computer, EEPROM does not require a power source to maintain its data.
For this reason EEPROM is commonly used by many BIOS chips to save system
settings."
http://www.wisegeek.com/what-is-eeprom.htm
....Here's a reference to the Dell support site on what they use:
"Dell systems use a NVRAM chip to hold the BIOS and System Setup
information."
"NVRAM is an acronym for Non-Volatile Random Access Memory, a type of memory
that retains its contents when power is turned off."
"In a Dell computer, NVRAM contains the BIOS (Basic Input/Output System), a
CMOS layer (complimentary metal-oxide semiconductor), and several other
layers."
and
"...EEPROMs were then developed. These are Electrically Erasable
Programmable Read Only Memory. EEPROMs can be erased with an electrical
signal. These are the physical chips used for most flash BIOS chips."
http://support.dell.com/support/topics/global.aspx/support/kb/en/document?dn=1012191&c=us&l=en&cs=&s=gen