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Troubleshooting Early Bally and Stern Pinball Machines -
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PINBALL TESTER
ULTIMATE MPU Manual
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Early Bally & Stern mpu & driver boards info & tips - YouTube
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Action Pinball - Bally & Stern General Game ROM Chip & Jumper Info
PINBALL TESTER
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Early Bally & Stern mpu & driver boards info & tips - YouTube
Bally MPU (A4) - YouTube
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