Quoted from PinballManiac40:Since U16 is already in an IC socket, it makes more sense to go with NVRAM. Being 24 pin and labeled with 6116, go with the new 6116 NVRAM. There is no benefit going with a coin cell battery, unless you like changing them as a normal 2 year maintenance. I prefer NVRAM.
I just have a bunch of CR2032 cells and I usually convert to that since it is much cheaper, but I have no problem going NVRAM on this Alltek. So, would any 2k x 8 NVRAM work, like a simtek or dallas? I have a few of those and if they will work, I can save a few bucks on ordering a new one. I have a NOS STK25C48 I think fits the bill.
Thanks for the suggestion.