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This page describes the procedure for rejumpering an early WPC CPU board to accept larger eproms used in later games and software revisions.
It is most commonly needed for Funhouse (Versions above vL-5) and Bride Of Pinbot (vL-7), but may be needed for other games.
The W1 and W2 jumpers are right next to the U6 CPU chip.
This table refers to how your CPU board must be jumpered to read the software you have installed correctly depending on the EEPROM size.