I am working on a Fireball Classic that has a truly strange problem. The game acts like it is awarding an extra (replay) ball every time the ball drains.
On starting a game the credits go down by one, then the ball count goes to zero, then the ball is released into the shooter lane, then the ball count goes to one.
When that ball drains (and it does not matter how few points have been scored) it is pushed into the trough, a ball is released into the shooter lane and the ball count stays at one. If the game is a multi player it continues scoring for player one (that at least makes sense). I have set the #16 and #17 values to 2 which should turn off all awards. There do not appear to be any dip switch settings that could cause this and they have not been changed since the game worked normally (it's not my game and the owner said it used to work fine). For no good reason other than it was easy to do, I checked the frequency of the CPU clock and it is correct at about 500 kHz. Any suggestions would be greatly appreciated!