CPU board PIA positions and jobs

The CPU board has six 6821 PIAs: 5F handles solenoids (PIA1), 11D lamps (PIA2), 11B display 2 (PIA3), 9B display 1 (PIA4), 8H switches (PIA5) and 7B sound (PIA6). Their addresses are printed as $2100, $2402, $2802, $2C02, $3002 and $3402 respectively.

Systems

• Data East CPU Version 1/2
• Data East CPU Version 3
• Data East/Sega CPU Version 3b

Related tips

• One PIA output does not toggle under the test EPROM
• Which logic chips drive which solenoid transistor pairs
• Test EPROM flash codes: which chip failed
• Segments missing or stuck on: CPU board PIAs 9B and 7B
• Switch column (drive) circuit on the CPU board
• Lamp column still dead after a new TIP42
• Whole switch column dead after working under the playfield
• One switch column dead: parts to check in order

Source: Repairing DataEast 1987 (Laser War) to Sega 1995 (Batman Forever), Part Two, Clay Harrell (pinrepair.com)