Stone Mountain, GA
My South Park just started not showing the interaction animation. Meaning, it keeps just playing the standby animation of a town slowly passing by. It seems intermittent. Any ideas as to what to might cause this?
Thanks!
Mike
(Topic ID: 175934)
Linked Games
South Park
Sega, 1999
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So when it is stuck, the animation is still moving, not static image? When you say standby animation, you mean the attract mode animation? Does it play all the standby animation or just the town graphics? How long will it stay this way, will it eventually correct itself?
It generally only plays the town animation. I just played a game and the first ball was stuck on the "kick the baby" animation for the whole ball. Then the next ball (ball 6?) and the third (ball 7) were stuck on the town animation. When the game was over it flashed this audit message as well. Attract mode is just a black screen. Here's a few pictures of what is happening.
Oh and btw, the difference in score between ball six and seven just happened. I didn't actually score any points between the two balls.
You didn't change anything to the game recently (like install a new eprom ?) ?
Then I would first suspect the flatcable going to the dmd controller.
Does the MPU have any battery alkaline damage? Could you post a picture of the board near the battery pack?
1 week later
Not sure if there is any acid damage. There was some battery leakage but I replaced the batteries and everything seemed ok.
Quoted from Deadmeat13:Not sure if there is any acid damage. There was some battery leakage but I replaced the batteries and everything seemed ok.
Could you post a picture of the board near the battery pack? It is not always easy to notice battery damage.
The fact that it is displaying the wrong frames and those frames have bad data built into them (random scores, ball 7, etc) points to the frames being generated incorrectly.
It is unclear to me if that function is performed on the display board or the CPU board. I would guess the CPU board which means having a good look at the potential battery acid damage a good idea.
Do you know anyone with this era game? If so, can you take your display and try it in his/her game? You can unplug the display and speaker connectors, remove the ground straps and take the whole speaker/display panel to your friends to see if it works properly in their machine.
Heck, if you want to drive up to Cumming, you can try all your boards in my South Park.
This just occurred to me, this era machine has the display ROM on the display driver board. This probably means the frames are generated on the display board. I would suspect the ribbon cable between the CPU and display boards. Carefully inspect that you have the pins lined up properly and pin 1 on each board is on the red tracer side of the cable.
If that all looks good, try swapping the cable end-for-end. This sometimes temporarily resoves a connection issues on one of the connections.
3 weeks later
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