Description This completely redesigned board Comes with Comet Game & Sound Roms (U21,U22 Sound & U27 Game Rom and NV Ram replaces the MPU board in all Williams System 9 through 11B games, NOW INCLUDING System 9-11 early games such as Comet and High Speed, view the full list below. Replaces Williams/Bally #D-10881-xxx, D-11932, & D-11883-xxx. Please note games with an (*) are 11C and you can use this board or the Rottendog MPU011C. This new board has a small balancing pot to compensate for the differences in volume on the MPU and soundboard. For System 9 games, the soundboard is not longer needed and incorporated in the new MPU board. Customs EPROMs are required for the System 9 games, which I can provide or you can make your own with the images I can provide. For all games, you must move over your (2) 6802 or 6808 processors or buy here. For System 11 games, you will need to swap over your two Game ROMS from your MPU board and the two Sound ROMs from the Soundboard or I will have options to buy them here in the future. All 6821s chips are provided, and the MPU9211 comes with NVRAM installed, no batteries are needed!    Benefits over the original Williams board: – Williams WPC type mounting holes for ease of install / uninstall. – No batteries required for memory retention (no acid damage, ever!) – Simplified driver design using logic level FETs – Beefed up switch matrix drive for better durability (good to 100V back drive) – Board is made with 100% through-hole components. – No custom parts used in this design (all parts can be purchased through usual suspects) – Major component designators carried over from original design so original schematics can be used. – Board comes with a complete set of schematics Game List: • Alley Cats (Shuffle) • Bad Cats • Banzai Run • Big Guns • Black Knight 2000 • *Bugs Bunny Birthday Ball • Comet • Cyclone • *Diner • *Dr. Dude (Non-WPC machines) • Earthshaker • Elvira and the Party Monsters • F14 Tomcat • Fire! • High Speed • *Game Show • Gold Mine (Shuffle) • Grand Lizard • Jokerz • Millionaire • Mousin’ Around • Pinbot • Police Force • *Pool Sharks • *Radical • *Riverboat Gambler • Road Kings • *Roller Games • Shuffle Inn (Shuffle) • Sorcerer • Space Shuttle • Space Station • Star Lite (very few machines were Sys 9) • Strike Zone (Shuffle) • Swords of Fury • Taxi • Tic Tac Strike (Shuffle) • Top Dawg (Shuffle) • Transporter • Whirlwind