Nine-flash LED code meanings

1: 6803 (U1) internal RAM. 2: U2 game ROM. 3: U3 game ROM. 4: U4 6116 RAM. 5: U8 6821 PIA-0. 6: U7 6821 PIA-1. 7: display interrupt in U1. 8: phase B lamp logic (U12 4584, U8), fed through power supply fuse F5. 9: phase A logic (U1, U11 4011, U12 4584), fed through fuse F4.

Systems

• Bally 6803

Games

• Atlantis
• Black Belt
• Blackwater 100
• City Slicker
• Dungeons & Dragons
• Escape from the Lost World
• Hardbody
• Heavy Metal Meltdown
• Motordome
• Party Animal
• Special Force
• Strange Science
• Truck Stop

Related tips

• How to read the flashes on pre-1988 6803 games
• How to read the flashes on the last four 6803 games
• Expected CPU LED flashes by game
• Missing lamp fuse changes the flash count
• Truck Stop and Atlantis: 6803 games built by Williams
• Game boots but will not take credits or start
• Nonsense adjustment values after a battery failure
• Factory CPU jumpers by game

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