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GX4000 weird problem, controllers interfered with each other

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Davor Vitief:
As the topic says when i play any game if/while both players hold button 1 or 2 simultaneously each control pad moves both characters  ??? . I have tried with a controller and a JY3 and different cartridges leading to the same result, any help is welcome, thank you.

Bryce:
There are diodes behind the joystick ports to stop this, probably one of them has failed.

Bryce.

Davor Vitief:
Thank you, i will take a look.

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