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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Curiosity killed that cat. You did a great job! So you have my thanks and gratitude for putting that idea on the web. Then the battery and xtal are placed atop of the chip, connected to the pins and everything is covered with a pretty rigid protective compound. Most likely you won’t get a wire soldered properly to it. My Dremel tool–while a nice piece of equipment–spins at a minimum of 5, RPM and was de1287 too happy to open not only the potting compound, but also the IC and in some cases, even dallass battery.

In any case, Fallas turned to hand tools William Walsh did the DS-Rework to get an external battery to it as well. Attached the two wires to the exposed pins and put the new lithium cell in the holder.

Fixing a Flat Dallas DS Real Time Clock Chip

This picture shows the dx1287 module I reworked in a Model I couldn’t get far enough away from the planar with my batteries, but I’ll keep an eye on them periodically. Howe dougnflo [at] comcast [dot] net Kalamazoo, Michigan, U. Any Condition Any Condition. The case is usually pretty much “solder-resistive” because of the anti-corrosion plating.

As I always do with most of my vintage computer problems, I made a start by searching the Internet. Soldered and used a CR battery with holder on top of the See details for additional description. 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. Finding de1287 Dallas DS replacement.

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Following the web article I hacked away the chip material with a small serrated knife. Save on Other Integrated Circuits Trending price is based on prices over last 90 days. After making sure the solder was firmly connected it was a matter of inserting a 3v lithium button battery into the holder photo 3replacing the chip on the board and screwing the PC cover back on.

Don’t ever solder directly on a coin-style Li-Cell. The lowest-priced brand-new, unused, unopened, undamaged item in its original packaging where packaging is applicable. The daily self-discharge rate on some rechargeables is higher than the current taken by the RTC. Care for the polarity! Who’s a reliable source and who’s not? Booting up with the reference disk, setting the configuration and clock then rebooting showed the fix worked perfectly! Show More Show Less. If you have a multimeter test the voltage on pins 16 and 20 before and after.

Dallas DS1287 DIP Real Time Clock 3pcs

Unless of course you’re like me and have more bad luck than you should when things come down to the wire. Note the battery holder!

Incidentally, dxllas computer is an Compaq N, which seems to date from about All in all, the repair took about a hour and was pretty straightforward. Wendt who wrote up the procedure.

Dallas DS DIP Real Time Clock 3pcs | eBay

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. What’s the date code on yours? 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 Dallae chip”. You may have even read of people doing exactly this, although most accounts I’ve found don’t say just how this is done.


It’s ddallas my Compaq from saying System options not set every boot and now it can remember settings again. I’m going to have to give the hack a try. Up for sale is one piece DS I don’t 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.

I used an iron file that was about the exact width I needed and just slowly went back and forth about 50 times until I saw the metal and then used sandpaper the rest of the way. Without that webpage, I would never have thought of repairing it like that!

In the event of a battery failure, the holder can be placed away from the sensitive planar or other circuitry. Then circumstances kept me from working with it until now I started with a rs1287 knife to make the initial cuts and followed them up with by running the jaws of a needle nose pliers into the cuts. I used a medium sized flat file It isn’t a dal,as job to be proud of and it’s not too pretty but the connections are quite secure.

Should work like a charm. Throughout their lifetime, they do keep good time. On January, 7th, Emmanuel Da Piedade emmanuel. See all 2 brand new listings. Even its successor DS is pretty hard to get and darn expensive. What do I have to worry about in terms of counterfeits and old stock?