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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I replaced my RTC chip in my Compaq Deskpro s with one of these sold by ericchungelectronic and it works perfectly. When it runs down, you are left vs1287 the task of finding a new module and then justifying the purchase price against the actual value of the computer itself.

Finding a Dallas DS replacement

It works like a champ! The lowest-priced brand-new, unused, unopened, undamaged item in its original packaging where packaging is applicable. The only things you need to do is: I found the hack much easier to perform.

All times are GMT The listing doesn’t say that the RTC comes with the battery and it has voltage something essential for machines that use these real time clocks so your old computer will be able to store it’s CMOS data again. Best rework chip, save lots of diy effort. I needed to do something about it! A really new, fresh and unused chip is hard to get.


While this one didn’t solder as nicely and had to be resoldered once when the positive lead came unglued! I found the substrate quite soft and easy to cut into. Great remanufactured chip I replaced my RTC chip in my Compaq Deskpro s with one of these sold by ericchungelectronic and it works perfectly.

Dallas DS1287 DIP Real Time Clock 3pcs

Of those, the following thread mentions certain things like the DS is not always a substitute for the DS See details for additional description. 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. If you aren’t afraid to get somewhat violent with these modules, you will find that inside the module itself is nothing more than a clock crystal, button cell battery and the DS, which is used in some systems with an external battery and clock crystal.

Originally Posted dwllas orion Even its successor DS is pretty hard to get and darn expensive. All power to the Internet and particular thanks to Peter.

Originally Posted by Chuck G. Care for the polarity! My hack job can be seen below.

Dallas DS DIP Real Time Clock 3pcs | eBay

There exists no modern day replacement for these, so re-energizing them is the only option. The usual reason for these errors is a flat CMOS battery. Now the battery is dead, configuration is lost after relatively short time again and you get error-codes constantly. So you have my thanks and gratitude for putting that idea on the web.


After the dust cleared It doesn’t take too long to figure out that the DS and other, similar modules could be re-energized with a new battery. Ordinarily, there’s a lot to like about the Dallas clock modules. I appreciate it greatly. And applying the replacement chips is easier for you than the hack? My old computer has been out of action for months, but this week I got it going again by following the instructions on your webpage “Reworking the DS RTC chip”.

Up for sale is one piece DS You dallws to be sure the battery is disconnected, so double-check with a voltmeter. Unless of course you’re like me and have more bad luck than you should when things come down to the wire.

Following the web article I hacked away the chip material with rallas small serrated knife. Soldering was the next big thing. Thank you very much for putting this mod on your web site.

If you follow his procedure, you’ll probably do fine. Who’s a reliable source and who’s not?