Sunday, 10 August 2025

Ghosts n Goblins (Bootleg) repair

 This Ghosts n Goblins bootleg just sat on a screen of garbage and did nothing.



I eventually found a 74LS74 with weak signals on the top board near the ribbon cable. Replacing the logic chip allowed it to boot and the sound worked but the sprites were messed up (which I forgot to photograph).

I traced this down to a 2114 ram on the bottom board using the piggyback trick (placing a good chip on top of the suspect one).

 
 
Someone had cut pin 18 and then resoldered it, I guess looking for a different bad ram but now this one is bad. Once replaced that fixed all the issues apart from one.

 

The last issue to resolve is that the board is an amputee, with only two and a half feet.

 
 
That's better.

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