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New There may also be
(depending on age of this relic)

A couple of pins to short, to zero the CMOS "officially", intended for use before initial fire-up of the board. Then usually - you use same shorting block to reconnect to the (new) battery. Mostly - I think these are labelled, near battery carrier and silk-screened "short" or such-like.

I've never experimented to confirm, as alleged -- that this step is necessary, so that next boot with battery renewed - properly loads BIOS defaults. But it can't hoit.


Ashton
(I used to pull most old-style CMOS Varta-like batts and install appropriate AA-cell carriers. EZ, cheap, only need do it once) But if yours is That old -
New There almost always is.
This jumper is to discharge CMOS with the battery in - but it's still advised to unplug the power supply cables to the motherboard. Without the jumper (or unable to find it) you have to remove the battery and disconnect the power supply cables (even with the wall cord unplugged, a powersupply may have enough residual voltage to keep CMOS alive for as much as half an hour).

Discharging the CMOS will sometimes return an insane computer to normal. Apparently there's important stuff in there the CMOS setup program doesn't touch.
[link|http://www.aaxnet.com|AAx]
New About those AAs
Noted your comment re heat, falling out.

Not claiming serendipity, but.. I always mounted mine outside the case, at back. Perhaps not the best solution in an office, but seemed 'cool'. All batteries like cool.

Thanks re the reset - hadn't occurred that there could be junk mem locations not automatically rewritten from BIOS menu. So much not to know..
     Possible (or worth it) to change a motherboard battery? - (drewk) - (21)
         All depends on the motherboard I guess - (Meerkat) - (1)
             Thanks, will check tonight (unless Greg remembers) -NT - (drewk)
         NTP configgering - (Yendor) - (1)
             Pretty sure I tried that - (drewk)
         get list of servers, ntptimeset -s -NT - (deSitter)
         Nearly all motherboards today . . . - (Andrew Grygus) - (10)
             Get the battery out, as Andrew says, and... - (a6l6e6x)
             Older motherboards - (orion) - (8)
                 Ripped those AA clips out any time I saw one.. - (Andrew Grygus) - (7)
                     That subdirectory factoid amazes computer people - (ben_tilly) - (6)
                         Even More amazing, a story I eaves dropped on the bus this - (boxley) - (4)
                             Let her have her delusions - (orion) - (3)
                                 'DEB' is no less offensive just coz someone else invented it - (Meerkat) - (2)
                                     I apoligize then - (orion)
                                     How the term DEB came about (new thread) - (orion)
                         Re: That subdirectory factoid amazes computer people - (deSitter)
         Should be a Battery similar to - (folkert) - (1)
             Cool, will be trying both (battery and pool.ntp) -NT - (drewk)
         There may also be - (Ashton) - (2)
             There almost always is. - (Andrew Grygus) - (1)
                 About those AAs - (Ashton)

May cause dizziness, rash, diarrhea, difficulty in breathing, loss of consciousness, extreme pain, bloody stools, flaccidity, amputation, blindness, suicidal thoughts, insanity, lesions, boils, bubonic plague, anal warts, vomiting up toads and lizards, violent convulsions, death, and likely poltergeist activity.
88 ms