Quoted from applejuice:1 controller board and 1 driver board, that are designed to work together, and replace all other bally boards except the power section on the old power driver board.
So does that mean in reality, replacing 3 boards? (CPU, solenoid driverboard, lamp board)
Curious what you're going to price it at. For comparison, Alltek is $350 for all of that (but it's only a replacement, doesn't give you the option of adding new rules, or sounds). Very cool project!
http://www.allteksystems.com/ordering-bally-stern.html