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SOLVED: Gaplus/Galaga 3 high score save (Midway board)

I see that JROK created a high score save mod for the Namco board of Gaplus/Galaga 3 (http://www.jrok.com/sohs/gap_shs.html), but does anyone know if a high score save exists for the Midway board or know which chips to replace? I haven't been able to find anything.
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