Stern games from 1980 on need an M-200 MPU

The M-200 carries a second 5101 RAM (U13) that later Stern code uses, so a Bally -17/-35 or a Stern M-100 will not run Stern games from 1980 onward. Since M-200s are scarce, use Bally boards in Bally games and keep M-200s for the Sterns.

Systems

• Stern MPU-200

Related tips

• Stern M-200 MPU jumper settings by ROM set
• Test EPROM: the least an MPU needs to run it
• 5101 RAM speed grades and which MPUs need what
• Testing an MPU in the game with only J4 connected
• MPU board test points
• Stern M-200 occasionally will not boot and the MPU reset button does nothing
• MPU board test point voltages
• Why the MPU has ROM jumpers

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