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Trying to find solder points
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TheLonelyChord:
Sorry for the bump, but maybe this can explain what I was trying to say:

Left side ( Ground / Button)

Right side ( Button / Ground )
ROM: Spaceknight:
If I had to guess, I'd say it's that wide trace around the outside of that unit.
TalkingOctopus:
This looks like a 3rd party ps1 pad.
danny_galaga:
think about what a 'ground' is in this case. it is a common connection for all the buttons. its really clear on that pcb which is the common for all those buttons. THAT is the ground.
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