[sdiy] cr-78 ram replacement

J Brave onephatcat at earthlink.net
Sun Jul 3 16:36:26 CEST 2016

Hi does anyone know how to determine which of the many variations of the 5101 ram chip would be the correct one? This is the one listed in the service manual: UPD5101C-E  

But I'm not finding that exact thing for sale - people are talking about replacing with Bally pinball ram - also 5051 on some forums, also there is a company selling an "equivalent" chip - but how do I know if I have the right matching chips? The pinball ram is far less pricy than the originals:

Pinball: https://www.ebay.com/itm/251898604630 
"Equivalent":  http://www.vetco.net/catalog/product_info.php?products_id=5199


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