tech: i robot video board problem

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Archived from groups: rec.games.video.arcade (More info?)

if anyone out there can help, i would appreciate it. I have an I Robot
that for the most part works has glitchy graphics i replaced the 4264
RAM and the glithy went away but now the background area what is
supposed to be black, now flashes white/black real fast and give you a
head ache. has anyone dealt with this problem that can help?
chris