Re: Asus P1-P55T2P4 Motherboard:
Where is the CMOS Battery? I have the original manual here and have searched the board itself: no mention or sign?
It's the DALLAS RTC/CMOS component.
yes, DS-12b887 , see my photos.
intel did not have NVRAM/RTC in the South bridge in 1997. is reason, evolution matters.
this should bet the last 1997 post here,
we hope,
use it as a door stop. or paper weight.
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It has got to be there. Sometimes they mount them vertically instead of flat. It is usually the size of a quarter. Type 2032.
wrong guess.
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Did you end up finding it?
wow a 1997 relic MOBO, why mess with this junk, it is now RARE! with ISA slots wow,
still running windows 98SE" or w95?
sure , all PCs made have service manual
not dirt cheap PC, they have near nothing.
that mobo is a desktop mobo.
a very old pentium 4, now a relic and near useless now, to 99.9% of persons. XP junk...
the coin cell is clear as day on the mobo if you just looked, use a flash light and look 1 more time.
P1 is wrong , it is P/I , not P1.
ok, that is why search fails using wrong model of mobo
asus.com ever heard of them #1 maker.
1second long search there finds this
https://www.asus.com/us/supportonly/PI-P...
old 430HX chip set relic.
read page 3 and 4 and learn back in 1997 there is NO COIN cell then.
they used a RTC clock chip that has hidden battery deep inside that fails in 10years.
from Dallas Semiconductors inc. long ago
I have scope that uses it and an a Spare.
the photo there page 3 clearly states
Self-PoweredRealTime Clock
cut and pasted just for you.
why mess with year 1997, love to know use?
me. (museum >)?
the reason is simple (I know it)
intel did not have RTC inside the old chipset back then,
so Asus, used a total RTC solution, DALLAS.
see actual mobo yours below, dallas.
i REPLACE THE DALLAS, IN MY SCOPES.
i ALSO KNOW HOW TO HACK IN A NEW BATTERY;
ASK.
THE BATTERY IS DEEP INSIDE THE DALLAS rtc.
THERE ARE 3 THINGS INSIDE, THE CHIP AND A BATTERY and NVRAM ! (Some versions have 2 batteries.) not this one. just 1.
inside a master and fail over battery.
if curious (Maxim now) data sheet.
http://pdf.datasheetcatalog.com/datashee...
circa 1995, battery, so is 26 year old battery now (worst case)
amazing no? old tech, and history
only boomers know that useless stuff. now.
why folks mess with 1995 PCs amazes me
yes it can be fixed that.
we can talk for 1 hour on topic.
lived it then,. solved them all. I did.
what I did on my scope Tektronix 2430 .
is remove the CHIP dallas.
then put in a 24 pin machine pin grade DIP socket and plugged in the new Dallas. chip.
fixed now for 10 more years.
or do as others did,
1: GROUND DOWN THE TOP OF THE DALLAS EXPOSING THE LITHIUM CELL. AND rip it out (cave man style) then with new coin holder and new cr2032 and new coin and wired by soldering
the the polarity matters.
to get that correct we use magic voltmeter.
to see what pin on the old battery is +
then mark that spot with red ink pin.
here is the hack sold by lots of others and me.
https://classic-computers.org.nz/blog/20...
done many now. and want to forget 1995 me.
but there you go, facts all.
i hope this cost you $1 for 1995 junk
or from dumpster dives?
it is worth ZERO now and for sure dead now.
BIOS will be DEAD like this,
my bud drilled a hole dead center and turned the mobo in to a wall clock.
with sign,below WARNING LEGACY TIME. 1995,
where you can not see , is where.
got a soldering iron and de-solder tools
i bet not, nor wish to learn.
it failed 10 years ago, then now 2021 expect it to work, or paid 10x what it is worth?
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