MPU327- This board replaces both the MPU board AND the Driver board for ALL Williams System 3, 4, 6 & 7 pinball games MPU327
MPU011A- This completely redesigned board replaces Williams System 11A & 11B MPU / Driver Boards part number D-11883-xxx (where xxx is the game number).
Used Williams Boards
MPU9211 Williams System 9 and 11 A B C MPU and Driver Board Rottendog – Little Shop Of Games
Working on Williams System 11 PINBOT Pinball PCB's MPU Testing With a Multimeter - YouTube
Fixing a dead Williams System 11 logic board – No Quarters Arcade
PINBALL: Repair Williams System 11 Pinball 1986-1990, part one
PINBALL: Repair Williams System 11 Pinball 1986-1990, part one
Bally / Williams Any System 11 B cpu mpu Flat Rate circuit board repair | eBay
Williams System 11 CPU MPU board pinball/shuffle alley with High Speed roms | #506553326