NV Ram adapter Williams System 3 and 4

Pinballparts
NV-RAM-WIL-3-4
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This multiple chipselect NVRAM module is suitable for Williams system 3 and system 4 CPU boards.
It replaces the 5101 memory chip and the backup batteries.
Never battery leakage  anymore and costly repairs as a result.
This NVRAM module is designed for mounting in a high quality 22 pin IC socket.