Thank you so much for your help. I'm asking my last silly question :shame: I solder the wire from Jamma's 5 volt socket to the Vcc pin of the arduino, which says 3.3 volts on the schematic, right? I just connected the arduino to the computer with ttl to test it, I measured it with a voltmeter...
First of all, thanks a lot for this great project, I want to use it in the mvs console I'm trying to make. I made the necessary preparations with Arduino and usb shield. I flashed the USB2DB15. My plan is to solder the pins in the circuit to the jamma with cables. But while reading the Adapter...