Hello :)

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I want to design an extension card where I can plug in the Game Boy link cable and connect the Game Boy or the printer. If the Game Boy is connected, I want to get the data stream from the Game Boy camera and store it and if the printer is connected, I want to use the printer for printing anything I want to. Also, I have the idea, to use that, for playing Tetris over the internet.

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For that, I’ll need to use the microcontroller from the Arduino Nano. How can I easily design an extension card using KiCAD?