I put one of these NVRAM chips in Rottendog MPU for Williams WPC (Getaway) and it works perfectly.
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Quoted from lyonsden:Also, as a general update, I've put these in 30 games so far over the past 1-2 years and have had no failures. They have been purchased from different people/groups in China (Ebay/AliExpress) so I assume used/pulls/etc. They do the trick and at under $2 per chip, they are the same price or cheaper than batteries. Between the low cost and removing the chance of battery leak damage, they are a no-brainer. Of course, there is always risk involved with removing old chips from some boards (e.g., WPC) and pulling/damaging traces.
While I've only done 2 of them (both of my pins), my experience has been the same as lyonsden with 100% success. I highly recommend ditching the batteries in exchange for NVRAM chips.
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