Bench-test a CPU board with the 6803 test EPROM

A test EPROM made for the 6803 board exercises the CPU and PIA ports, the RAM and every lamp and coil output with the board on the bench, using LEDs on the connectors in place of lamps and coils. It is burned into a 27128 and goes in socket U3; U2 can stay or come out.

Systems

• Bally 6803

Related tips

• What is on the 6803 CPU board
• Time Machine: CPU and display EPROM types and latest versions
• Robocop: CPU and display EPROM types and latest versions
• The Simpsons: CPU and display EPROM types and latest versions
• Checkpoint: CPU and display EPROM types and latest versions
• Batman: CPU and display EPROM types and latest versions
• Secret Service: CPU and display EPROM types and latest versions
• Torpedo Alley: CPU and display EPROM types and latest versions

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