Well – these have the dreaded Dallas DS “all in one” Real Time Clock (RTC) chip with integrated Xtal and battery. Now the battery is dead, configuration is. FEATURES. ▫ Drop–in replacement for IBM AT computer clock/calendar. ▫ Pin compatible with the MCB and. DSA. ▫ Totally nonvolatile with over Dallas DS, DS and Compatibles – External Battery Rework Advice. The following is some extra information that you might find useful if you plan to.

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At that point you wish you could add an external battery. That is assuming you can get the part in the rs1287 place. I didn’t feel up to soldering a CR holder onto the module and there’s the question of finding one in stores around hereso I purchased a triple-A battery holder and some batteries from Radio Shack.

Dallas DS DIP Real Time Clock 3pcs | eBay

Packaging should be the dw1287 as what is found in a retail store, unless the item is handmade or was packaged by the manufacturer in non-retail packaging, such as an unprinted box or plastic bag. All power to the Internet and particular thanks to Peter.

I couldn’t get far enough away from the dallsa with my batteries, but I’ll keep an eye on them periodically. What do I have to worry about in terms of counterfeits and old stock?


The suggested implement to open these modules is a Dremel tool.

Possible Results Reworked chip inside a Mod. Originally Posted by orion Following the web article I hacked away the chip material with a small serrated knife.

There are lots of old threads here on DS replacement. You may have even read of people doing exactly this, although most accounts I’ve found don’t say just how this is done.

When you get past the potting compound and into the terminals, clear away just enough potting resin to catch the negative battery terminal heading up to the top of the package.

All described modifictions apply to this chip as well.

Dallas DS1287 DIP Real Time Clock 3pcs

They have a tendency dalals bend when you aren’t looking. In the event of a battery failure, the holder can be placed away from the sensitive planar or other circuitry. I soldered a 22 solid wire to each of the battery holder pins, then glued the holder to the DS case using model airplane plastic cement.

I xs1287 know about the DS, but with most clock chips the battery isn’t connected until the first time you power up the chip, so even sitting on a shelf for 10 years should have minimal effect on the battery life.

Soon I’d uncovered the two pins I needed to access photo 2. While this one didn’t solder as nicely and had to be resoldered once when the positive lead came unglued! I used an iron file that was about the exact width I needed and just slowly went back and forth about 50 dalls until I saw the cs1287 and then used sandpaper the rest of the way.


It sets too fast! Now the battery is dead, configuration is lost after relatively short time again and you get error-codes daloas. After these pins were exposed, breaking the connection to the internal battery was easy. Ordinarily, there’s a lot to like about the Dallas clock modules. All times are GMT Go with the hot glue. Even its successor Da,las is pretty hard to get and darn expensive.

When you’ve exposed this, punch through it with a nail, awl or similarly sharp device. It involved hacking away parts of the chip, then rewiring an external battery onto it. The 0V-reading tells you that you successfully disconnected the battery. Rather neat perhaps, until the battery goes flat in which case the whole chip needs to be replaced!

Reworking the DS / DS RTC chip

See details for additional description. Not easy when dealing with a computer over 20 years old. Booting up with the reference disk, setting the configuration and clock then rebooting showed the fix worked perfectly!