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Tuesday 2 January 2018 at 19:43
Glad you got it working without having to pay for a new MPU board. Switch matrix is one of the most common "damage" areas of both Gottlieb System 1 and System 80 due to the fact that the playfield has higher voltages present than the ICs can handle and when people get their hands in there and start...
Source: http://pinside.com/pinball/forum/topic/system-1-rom-and-continuous-scoring#post-4154817