Hi, i have ported an Apple II smartport floppy disk emulator to Arduino, using an SD card adapter and connecting it to the IDC 19-pin of an Apple IIc and IIgs. It works fine but... only when connected with USB, attached to the PC or via a phone charger I'm making test since weeks, but i can't stan…

Apple II smartport emulator, sketch works only when usb powered.

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