A chap called Dick Hamill has written an arduino system that allows you to run your bally or stern solid state games with new game code. The arduino takes over the game instead of the MPU processor and ROM code. He's developing a plug in board - really quite neat.
He and other folk are writing game code, with new rules, new features, adding modes, and ability to add sound and call outs !
Really interesting stuff. (well, it is to me ).
https://pinside.com/pinball/forum/topic/replacing-the-m6800-in-a-stern-mpu100-with-an-arduino
He and other folk are writing game code, with new rules, new features, adding modes, and ability to add sound and call outs !
Really interesting stuff. (well, it is to me ).
https://pinside.com/pinball/forum/topic/replacing-the-m6800-in-a-stern-mpu100-with-an-arduino