I need to get the battery off of my Mad Planets PCB. What CMOS RAM do I need to replace with NVRAM? Anything else to do? I googled the hell out of this and couldn't find anything.
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MK48Z02 or DS1220. I dont know the simtek part number off the top of my head. I believe two of the rams need to be replaced, its the two on the right looking at the pcb with the edge connector facing north.
You should have 6116LP in there (low power rams, battery backed).
(yes, 5v is dead on no issues)
This might be your problem if your measuring voltage at the power supply. Qbert has significant drop in voltage across the harness and the nvrams are sensitive to voltage. If it drops slightly below 5v it locks the ram out. Ideal voltage at the nvram would be around 5.05-5.10v.