Test points and LEDs added for all voltages generated on the board. Test point locations put into one location and clearly marked for easier troubleshooting Upgades newer version driver board compatible with Williams WPC89 and WPC-S pinball games. This board is a direct plug in replacement for the original OEM part. The original driver board this board replaces are part numbers: A-12697-1, A-12697-3, and A-12697-4. You can see and play the game (and many others about 50 to check out) in our showroom if you like.Please see our web site for more gameroom fun. This is a challenging game with lots of features to keep you entertained. This Pinball Machine is Lots of Fun to Play for Anyone and makes a great addition to any billi.