An original System 6 MPU board which can be used in the following pinball machines NVRAM fitted - batteries not needed.
WILLIAMS PINBALL MACHINE SYSTEM 11c MPU / DRIVER BOARD
WILLIAMS PINBALL MACHINE SYSTEM 4 MPU / CPU BOARD
WILLIAMS PINBALL MACHINE SYSTEM 11 MPU / DRIVER BOARD
WILLIAMS PINBALL MACHINE SYSTEM 6 MPU / CPU BOARD
Williams Pinball Machine Sytstem 6 - 7 Speech Board
