I did this a while back to make it easier for people to figure out which NVRAM to purchase for their games:
Since I've been involved with the NVRAM product as far back as 2012, I've always put out a ton of info on the product pages to simplify things. IMO the best concise resources for figuring out NVRAM is the PDF I linked above & also my individual product pages for each type of NVRAM @ https://www.pinitech.com/products/cat_nvram.php
I've got board diagrams highlighting the RAM chip to replace, a rating of difficulty of installation on boards that require soldering, jumper changes listed, etc. IMO makes it easy as pie to understand. It's important for me to make sure people are comfortable with the product and what they're getting themselves into. Some NVRAM is plug-and-play, anyone can do it. Some of it requires modification of the circuit boards. I'd rather help people make an informed decision than see MPU boards damaged or the wrong chip was replaced because not enough information was out there.