Stern boards of 1977-1982 interchange with Bally

Stern's solid-state boards were copied from the Bally design, so most boards swap between the two makes. Stern later changed its MPU to add RAM and ROM, and the Bally and Stern solenoid driver boards are interchangeable (page 45).

Systems

• Bally MPU AS-2518-17
• Bally MPU AS-2518-35
• Stern MPU-100
• Stern MPU-200

Related tips

• Bally and Stern solenoid driver boards interchange

Source: Repairing Bally Electronic Pinball Games from 1977 to 1985, Part One, Clay Harrell (pinrepair.com)