M-200 clock-speed jumpers E32-E33 and E34-E35

Removing E32-E33 and E34-E35 slows the M-200 clock for Bally games or M-100 era Sterns, though leaving them in usually works in Bally games (the start-up sequence just runs quicker). The extra 5101 at U13 can be pulled for Bally use. In a later Stern game, removing those jumpers makes everything, including the start-up tones, run noticeably slow.

Systems

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

Related tips

• Why the MPU has ROM jumpers
• Checking U6 and the jumpers with the U9 VMA line
• Get the MPU working before changing jumpers
• Add a ground jumper on every -17/-35 MPU
• Get the MPU booting before you change any ROM jumpers
• Fit new C14 and C15 for a cleaner reset and clock
• Jumpers for a -35/-133 MPU running two 2732 EPROMs (U2 and U6)
• Bally -35 MPU jumper settings by ROM type

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