Berzerk High Score Table Corruption

jeffsgames

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Donor 2011, 2015
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Anyone got a clue where I should start looking on this issue? The high score table and credits are corrupted. Every time I turn on the game this is what I get. When games are finished, their scores are added just fine, and they stay on there until the game is turned off. I have a cell phone battery with a good charge wired in to the game, so it should save scores but doesn't. Also, the corruption causes the game to think there are credits in it. Acts almost like a free-play kit so that's not so bad. Still want to fix it back to 100%. Everything else plays great, exactly as it should.

Thanks in advance for any help!
 

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To remove the corrupt scores you need to do a clear book keeping.

It should start keeping scores after that. If not there is another problem with the NVram, or battery.
 
To remove the corrupt scores you need to do a clear book keeping.

It should start keeping scores after that. If not there is another problem with the NVram, or battery.

I have cleared the scores, but it didn't last. Maybe it is a problem with the NVram. What chip is that one? I'll check the schematic later tonight.
 
Thanks! That's exactly what I was hoping to hear. I have some traces that are rough, so I'll meter all of them to make sure.

Anything possible over the ribbon cables?
 
Thanks! That's exactly what I was hoping to hear. I have some traces that are rough, so I'll meter all of them to make sure.

Anything possible over the ribbon cables?

Ribbon cables have nothing to do with the high score table. High score information is stored in the RAM chip Mark noted.....the battery basically keeps this chip "on" at all times. The battery and this RAM reside on the same pcb (thus, the ribbons are irrelevant). If the RAM chip doesn't have enough juice....or if it drops for a fraction of a second....you can have issues.

Edward
 
Measure between GND and pin 18 of the RAM chip at position 1E while the board is off. There should be about 3 Volts.

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There is no NVRAM on a ZPU board, else it wouldn't require an external battery.

I installed a lithium battery on a couple of ZPU's works like a charm. The only thing needed to change is one resistor for a schottky diode (thanks to mark for suggesting that).

Here's a pretty clear walk-through:
http://forum.arcadecontrols.com/index.php?topic=97846.msg1051879#msg1051879
 
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