5101 NVram Module.
The 5101 module replaces 5101, 6501, and 2101 RAM chips.
For many Bally, Gottlieb, Stern, Williams systems to eliminate the need for batteries to retain data. Simply remove the original ram, install the module and remove the batteries. Soldering may be necessary on some boards.
These may not function correctly on all boards. They have only been tested on some pinballs.