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Thanks friend, it gives me the same reading, 98 ohms between 3v3 and ground, I do not have more advanced knowledge to know what is happening to my board, the mx4sio that I manufactured on a memory card worked for me on another console, so the problem must be my board.

Is it normal that the 3v3 and ground points give continuity by measuring them with the multimeter? It happens to me in both control ports. I have tried in many ways to get the mx4sio to work, but when I barely do the installation it detects the opl, I It lets you enter a game, I play it for 20...

After trimming the board, do you need to connect that controls pin to the voltage regulator as in the video? On this board that is also different, thank you.