Galaga

Talon2000

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Got an issue with the Blue bee when it splits to the 3. Scorpions etc..

Only those ships will have a square in the corners surrounding them. Like the 8x8 sprite has a block in each corner. It's only on those ships. All the others, even on challenging stages up to lvl 38 so far seem to have no problems.

I've checked all the proms, roms, and rams on the video board. They are clean, and checksums verify. Sockets have been replaced.

Ideas?
 
If you already check the Roms and it has already been socketed, It sounds like the data on a rom is not being is not getting where it's suppose to be. It sounds like you have a broken trace someplace. If your lucky it a cold solder joint and a little touch up with a soldering iron will fix it.

or you have a bad resister pack and one of the legs have broken free.

or you have a broken trace which means either probing around the chip with a logic probe or scope.
 
Resistor packs have been replaced.

It would help to know which rom controls those particular sprites before I just go off and randomly start checking bus lines.

Also it's only in one certain part of the game, so it will be difficult to tell which line if any isn't working, since it's only a few characters that pop on on occasion.
 
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