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 found the hack much easier dallax perform. Of those, the following thread mentions certain things like the DS is not always a substitute for the DS Without that webpage, I would never have thought of repairing it like that!

Reworking the DS / DS RTC chip

William Walsh did the DS-Rework to get an external battery to it as well. Note the battery holder! This picture shows the second module I reworked in a Model There exists no modern day replacement for these, so re-energizing them is the only option. In fact, go print a copy of it right now.

All times are GMT I know the DS is a newer replacement, but is it still in production? This worked very well and allowed me to put the batteries in a location where they’d be easier to change. It won’t do it dalls good and may result in early death of that part due to excessive internal heating.


Attached the two wires to the exposed pins and put the new lithium cell in the holder. Should work like a charm.

Curiosity killed that cat. Then circumstances kept me from working ds287 it until now While this one didn’t solder as nicely and had to be resoldered once when the positive lead came unglued!

After the dust cleared Daallas a bad deal if you don’t mind a few years knocked off of the battery life. You want to be sure the battery is disconnected, so double-check with a voltmeter. It’s stopped my Compaq from saying System options not set every boot and now it can remember settings again.

Booting up with the reference disk, setting the configuration and clock then rebooting showed the fix worked perfectly! Ratings and Reviews Write a review. I’ll let you all know how it turns out.

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. Up for sale is one piece DS Following the web article I hacked away the chip material with a small serrated knife. 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.


Dallas DS1287 DIP Real Time Clock 3pcs

Their lifetime is also quite long. The suggested implement to open these modules is a Dremel tool. Almost immediately I found an article written by someone who had the same issue and had published a solution.

There are no provisions for one. I discovered that the RTC chip was dead. I could not have gotten my Compaq DeskPro e back to clock life back without you!


I appreciate it greatly. You will want it later if your rs1287 bench isn’t near a computer. If you have a multimeter test the voltage on pins 16 and 20 before and after.

Best rework chip, save lots of diy effort. It doesn’t take too long to figure out that the DS and other, similar modules could be re-energized with a new battery.

What do I have to worry about in terms of counterfeits and old stock? Problem with any DS is that they haven’t been made in years. Not easy when dealing with a computer over 20 years old.

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