Williams Defender Early Series Boardset
The Defender early series boardset is limited to upright games only, the CPU and Interface boards cannot be used in a Cocktail game as they lack the hardware for screen rotation and player 2 controls.
The ROM, Sound and Power Supply boards can be used in upright or cocktail games and with the exception of the cocktail game restriction they can all be mixed freely with later series boards.
Defender boards cannot be used in any other game.
Disclaimer:
Although I have done my best to ensure that all information contained on this page is correct, I can take no responsibility for damage to you or your game!