ROM and EPROM types used on Bally MPUs

Masked ROMs are 9316 (16k bit) or 9332 (32k bit). EPROMs are 2516 or 2716 (16k bit, identical, same jumpers), 2532 or 2732 (32k bit). The 2532 and 2732 have different pinouts and need different jumpers; the 2532 uses the same jumpers as the 9332. Read the type off the chip before setting jumpers.

Systems

• Bally MPU AS-2518-17
• Bally MPU AS-2518-35

Related tips

• Bally -35 MPU jumper settings by ROM type
• Why the MPU has ROM jumpers
• Setting up an MPU for the test EPROM
• How to read Bally jumper charts and identify ROM types
• Test EPROM: the least an MPU needs to run it
• After the test EPROM: refit the game ROM and count flashes
• Get the MPU booting before you change any ROM jumpers
• 9332 masked ROMs can be replaced by 2532 EPROMs as-is

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