Jul 022016
 

The game belonging to my personal collection didn’t boot anymore after several years kept in storage.

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Game was in mint condition but the address decoder custom 34 had lot of oxidation on the pins (common problem on these custom chips) so I proceeded to clean and reseat it paying particular attention to avoid breaking pins which generally are really weak.

Game booted but it developed the following problem

 

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After probing around on the rams and TTL for suspicious signals with no luck I decided to dig up my dead Gaplus board which I kept in my garage for Namco customs spare parts and checked one by one each custom.

After changing the CUS20 (tilemap and sprie address generator) the problem was fixed

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Another Fujitsu chip left our world.