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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The only things you need to do is: I used a medium sized flat file Rather neat perhaps, until the battery goes flat in which case the whole chip needs to be replaced!

The suggested implement to open these modules is a Dremel tool. All times are GMT I found the hack much easier to perform. The 0V-reading tells you that you successfully disconnected the battery. When you’ve exposed this, punch through it with a nail, awl or similarly sharp device.

If you fix the bent pins too many times, they will break off. All described modifictions apply to this chip as well. I discovered that the RTC chip was dead.

Show More Show Less. 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. Curiosity killed that cat. It won’t do you any good to “charge” the depleted button cell. There exists no modern day replacement for these, so re-energizing them is the only option.


Who’s a reliable source and who’s not? Results 1 to 10 of Problem with any DS is that they haven’t been made in years. That usually ends the experiment before you’ve even arrived at the part where the module is exposed to the blistering heat of your soldering iron.

There are no provisions for one. The time now is I couldn’t get far enough away from the planar with my batteries, but I’ll keep an eye on them periodically.

Dallas DS1287 DIP Real Time Clock 3pcs

Fortunately, Peter Wendt of MCA Mafia fame has come up with an excellent page describing the subject of breaking open Dallas clock modules and how to connect them to external power sources.

These are intended for short-term use with strong charge and discharge intervals – not for long-term storage with a comparatively small discharge rate.

After making sure the solder was firmly connected it was a matter of inserting a 3v lithium button battery into the holder photo 3replacing ss1287 chip on the board and screwing the PC cover back on. Wendt who wrote up the procedure. It works like a champ! Don’t use rechargeable batteries.

Even its successor DS is pretty hard to get and darn expensive. In my replacing it, needed de-soldering it as well, daolas not that easy. Following the web article I hacked away the chip material with a small serrated knife.

Dallas DS DIP Real Time Clock 3pcs | eBay

And applying the de1287 chips is easier for you than the hack? There are lots of old threads here on DS replacement. You want to be sure the battery is disconnected, so double-check with a voltmeter.

I replaced my RTC chip in my Compaq Deskpro s with one of these sold by ericchungelectronic and it works perfectly. I just want to tell you that I succesfully used your DS rework How-to. All power to the Internet and particular thanks to Peter. Every time I booted daallas the machine, I was greeted with the errors above.


My Dremel tool–while a nice piece of equipment–spins at a minimum of 5, RPM and was all too happy to open not only the potting compound, but also the IC and in some cases, even the battery. Not sure how long these will last, but I have 3 now so if the batteries do die in them again, they can be modified.

Best rework chip, save lots of diy effort. I appreciate it greatly. Here Best Regards Emmanuel. However the process is not always quite so hassle-free. That is assuming you daallas get the part in the first place.

Unless of course you’re like me and have more bad luck than you should when things come down to the wire. 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. For anyone who attempts this mod Not easy when dealing with a computer over 20 years old.

Finding a Dallas DS replacement

Throughout their lifetime, they do keep good time. When it runs down, you are left with the task of finding a new module and then justifying the purchase price against the actual value of the computer itself. I’ll let you all know how it turns out.