Sep 202015

Just a quick fix for a Shadow Warriors PCB I had since many years but never looked at:

Shadow Warriors_PCB

Gameplay was fine but all the backgrounds GFX were scrambled and messy:


This is the part of circuit which generates the backgrounds, located on video board:


Luckily EPROMs and RAMs were socketed so I first tested the latter and found a bad one @3D (a Toshiba T5563 pin to pin compatible to a generic 6264) :


Replacing the bad chip was enough to clear the issue.



 Posted by at 11:21 pm

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