How to read Bally jumper charts and identify ROM types

Jumper pads are all prefixed E, so "1-4" means wire E1 to E4; take out any jumper the chart does not list. The Bally part number on a chip does not tell you its type: solid black chips with white printing are 9316-style masked ROMs, while EPROMs have a clear window (keep its label on so light cannot erase it) and are marked 2716, 2532 or 2732.

Systems

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

Related tips

• Bally -35 MPU jumper settings by ROM type
• ROM and EPROM types used on Bally MPUs
• Bally -17 and Stern M-100 ROM jumper settings
• Why the MPU has ROM jumpers
• Get the MPU booting before you change any ROM jumpers
• Stern M-200 MPU jumper settings by ROM set
• Leave the ROM jumpers alone until the LED flickers
• Turning an M-200 into an M-100, or running two- and three-ROM Bally sets

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