EM Tech: Score Motors and Bonus Counts in Electromechanical Pinball with Mark Gibson

Bonus count circuits can be tricky, especially when multipliers enter the mix. Join pinball historian and educator Mark Gibson of [FunWithPinball.com]( as he pulls back the curtain on the clever engineering behind electromechanical pinball machines. In this deep dive, you’ll explore how score motors, relays, and stepper units work together to calculate single, double, and triple bonus values with remarkable precision. Mark breaks down the logic and timing behind these fascinating circuits, making complex EM scoring systems easier to understand for collectors, restorers, and pinball enthusiasts alike. Whether you're troubleshooting a machine or simply curious about the ingenuity of classic pinball design, this session offers a fun and insightful look into the mechanical magic that powers bonus counting. This seminar was recorded at Golden State Pinball University 2026 as part of the Pinball University Series. Learn more: