Jumpers JW8-JW11 for the spare driver circuits

U7 PIA outputs PB14 and PB15 are spare and reach the board's spare drivers only through jumpers. JW8: PB14 to general purpose driver 1 (J9 pin 9). JW9: PB14 to switch drive 1 (J4 pin 1, switch strobe 5). JW10: PB15 to general purpose driver 2 (J7-4, J6-7 or both). JW11: PB15 to switch drive 2 (J2 pin 19). Fit them to match the game.

Systems

• Bally 6803

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