![MPU011A- This completely redesigned board replaces Williams System 11A & 11B MPU / Driver Boards part number D-11883-xxx (where xxx is the game number). MPU011A- This completely redesigned board replaces Williams System 11A & 11B MPU / Driver Boards part number D-11883-xxx (where xxx is the game number).](https://www.thepinballwizard.net/images/products/pmpu-0004.jpg)
MPU011A- This completely redesigned board replaces Williams System 11A & 11B MPU / Driver Boards part number D-11883-xxx (where xxx is the game number).
![TECH: How to replace the battery holder on a Williams System 11 CPU board | Museum of the Game® Forums TECH: How to replace the battery holder on a Williams System 11 CPU board | Museum of the Game® Forums](http://johnsarcade.com/images/whirlwind/close_up_1.jpg)
TECH: How to replace the battery holder on a Williams System 11 CPU board | Museum of the Game® Forums
![TECH: How to replace the battery holder on a Williams System 11 CPU board | Museum of the Game® Forums TECH: How to replace the battery holder on a Williams System 11 CPU board | Museum of the Game® Forums](http://www.johnsarcade.com/images/whirlwind/not_so_close_1.jpg)