I learned a good lesson fixing this faulty video card (Twinhead CT-6040S) | Adrian's Digital Basement (youtube.com)
from cm0002@lemmy.world to retrocomputing@lemmy.sdf.org on 13 Apr 07:37
https://lemmy.world/post/28159364

This ISA video card doesn’t work. There are no schematics so this is going to be an adventure to figure out why this card bad. Get your oscilloscope ready!

#retrocomputing