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:

bad_backgrounds

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

backgrounds_circuitry

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) :

T5563@3D

Replacing the bad chip was enough to clear the issue.

backgrounds_fixed

 

 Posted by at 11:21 pm