What is on the 6803 CPU board

One board does both the CPU and driver jobs: a 6803 processor (with on-chip RAM), two 6821 PIAs that handle lamps, coils and switches, and a 6116 static RAM for settings instead of the old 5101. Combining the boards cut the number of connectors in the game.

Systems

• Bally 6803

Related tips

• Bench-test a CPU board with the 6803 test EPROM
• Power a 6803 CPU board on the bench with a PC supply
• CPU board test points
• Check the 6803 clock at U1 pins 2 and 3
• Factory CPU jumpers by game
• Electronic spares for 6803 board repair
• Cybernaut can have a -35, 6802 or 6803 boardset
• Find a bad 6803 or a shorted bus line

Source: Repairing Bally 6803 Pinball Games from 1985 to 1989, Clay Harrell (pinrepair.com)