Identifying The CMOS CHIP

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scrolljoe 42

I'm curious ! how does one identify the Cmos chip on the motherboar


Was it a seperate removable chip in the past..is it now integrated o
MB

Tried researching same but could not find an answer. Thanks for any

imput. :cool
 
I'm curious ! how does one identify the Cmos chip on the motherboard?
Was it a seperate removable chip in the past..is it now integrated on
MB ?
Tried researching same but could not find an answer. Thanks for any

imput. :cool:
Click to expand...

I think you mean the BIOS chip? Normally it's this squarish thing on
the board with a bring shiny sticker with words to the effect of
"xxxBIOS" where xxx could be AMI/Award/Phoenix etc :P
 
No Angel ! I am talking about the CMOS chip. ;)
Click to expand...

The CMOS RAM, RTC, and keyboard controller are incorporated into the
chipsets of modern motherboards.

- Franc Zabkar
 
scrolljoe said:
I'm curious ! how does one identify the Cmos chip on the motherboard ?

Was it a seperate removable chip in the past..is it now integrated on
MB ?

Tried researching same but could not find an answer. Thanks for any
Click to expand...

I did a search, and the very first hit said, "The original RTC/CMOS
chip was the Motorola MC146818". I don't see how anybody could have
put less effort into the search than I did and not find anything,
unless he or she was a librarian for the Phoenix municipal library
system.
No Angel ! I am talking about the CMOS chip. ;)
Click to expand...

Can you point out a non-CMOS chip on a mobo made in the past five
years?

OTOH the MC146818 clock/battery-backed setup memory is now part of the
south bridge chip. Look for the tiny silvery cylinder laying on its
side, with two wires sticking out one end. That's the crystal (could
be marked "32768", which is how many times it ticks per second). The
chip should be nearby. If you want more information about the original
Motorola part, you may have to search www.freescale.com or
www.onsemi.com because Motorola sold off a lot of their chip operations
(the incompetent son of the founder ran the company into ground and
started a preemptive war to find nonexistent WMDs).
 
Thanks for your research Larry..I now have an idea resulting from al
previous posts as to where is the elusive CMOS chip. And Larry, m
interest in mobos is less than 5 years...3 is more like th
figure..you see ,I am a student.

On an aside, the search for WMD will continue long after the Founder'
son is gone..methinks he ran the Company into a hole from which it'
'tuff
to get out. Peace..have a good day. :
 
I'm curious ! how does one identify the Cmos chip on the motherboard
?

Was it a seperate removable chip in the past..is it now integrated on
MB ?

Tried researching same but could not find an answer. Thanks for any
Click to expand...

Try a search on "Dallas CMOS memory" - before the current crop of
integrated chipsets where the CMOS is on the chipset or the Super IO chip,
with an external button battery, there was the Dallas (and copies) "chip"
which included a battery, CMOS and real time clock. You couldn't miss the
Dallas "chip" - it was big and it looked like you could separate the top
half from the bottom, with the thought it might be a hidden socket...
something I never actually got around to checking out.:-)
 
Larry wrote
. Look for the tiny silvery cylinder laying on its
side, with two wires sticking out one end. That's the crystal (coul
Click to expand...
be marked "32768", which is how many times it ticks pe second). The
chip should be nearb
Click to expand...

Found a couple of old MBs and looked for that shine capacitor- lik
tube
and the nearby chip..found and researched same....must say it's
learning process...there is something to be learnt every day.Thank
again

George , thanks for your imput. Saw a pic of the dallas clock chip
What I did find on an old Compaq was its cousin ..a Tadiran 3.6
lithium with 2 leads [TL-5283/C]..this look-alike does not have th
CMos component. Thanks again
 
George said:
Try a search on "Dallas CMOS memory" - before the current crop of
integrated chipsets where the CMOS is on the chipset or the Super IO chip,
with an external button battery, there was the Dallas (and copies) "chip"
which included a battery, CMOS and real time clock. You couldn't miss the
Dallas "chip" - it was big and it looked like you could separate the top
half from the bottom, with the thought it might be a hidden socket...
something I never actually got around to checking out.:-)
Click to expand...

I have one dated 1994, on a mobo I found several years ago, and it's
still keeping decent time . It's off by slightly more than 2 mins.,
but I've never reset it (no Y2K calendar bug). I've never had a
lithium battery last nearly that long with any of my other mobos
 
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