While the Arduino family of boards connect to your computer using a USB virtual serial port, the ATmega ones have an actual serial connection on-board.

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Arduino Nano screw terminal adapter “With a finished project, you’re likely to make permanent connections to your Nano by soldering it.

Serial terminal servers are dirt cheap and let you tap remotely into the consoles of a range of devices Sometimes a simple piece of hardware or software — and the presence of mind to install it ...