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Does anyone know which Memory chip(s) control the walls on Vanguard? My Vanguard plays well but it quit displaying the walls/maze... I have a a new board, but it does not even display an picture, so Im hping to swap out the bad chip(s) Any help would be greatly appreciated..

I recently purchased a Vanguard game, and shortly after playing it, the mazes diasappeared. Then the monitor displayed the ship in triplicate.... any ideas??? Thanks! Mike