The CPU must be a 68B09E
The WPC processor at U4 must be a 68B09E. A plain 6809E or 68B09 will not run the game. U6 is the game ROM, U8 the 2064 RAM and U9 the WPC ASIC.
Systems
Related tips
- What is on the WPC CPU board
- Which System 11 CPU boards fit which games
- What fails on a WPC CPU board
- Dead CPU: isolate it from the other boards
- Why coils stay off until the CPU boots
- Running a WPC CPU board on the bench
- Reseating the U9 ASIC on a dead CPU board
- Dead CPU: the order to replace chips
Source: Repairing Williams/Bally WPC Pinball Games from 1990 to 1999, Part One, Clay Harrell (pinrepair.com)