Is your original system 11C board damaged or missing? If damaged, post a picture of it.
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Quoted from TxDremz:mem protec failure
Start with posting a picture. If there is no or minor battery corrosion, then board is repairable.
I could install NVRAM for you to keep that perfect MPU looking like that forever, which removes the batteries. I even have the C30 and night even have all capacitors on hand for a cap rebuild for that power supply. I live out close Katy. Also, Tim in Cosby of Crosby Pinball could also do it since he is less than half the distance than I am from you.
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