What differentiates this project from the typicalemulator is that no reference is made to theoriginal programs encoded on the MPU firmware.Instead, I employed a black box, or cleanroom, method based on studying their function ratherthan their internal structure. For me, it made senseto interpret these 66 electrical connections in termsof their purpose in a closed-loop process controlmodel. That is, each is either input, output, part ofa feedback circuit or part of the power supply. Thefour main divisions of the pinball machine controlsystem are the solenoids, switch matrix, featurelamps and digital displays. I intentionally leftout the digital displays for the first prototype,which is why the apparatus uses the computer monitorto show the scores. The analysis yielded the processmodel shown in Figure 2.
Circuit Wizard Release Code 139
2ff7e9595c
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