Raspberry Pi can be used to interface with the real world from its GPIO, for example, by controlling a stepper motor. You can also use Raspberry Pi to dialog with some devices—like Arduino—by using a serial USB port.
Back in my day I remember using Clipper programming language and a book on how to program the HP Laserjet, to resd and write via the parallel port to make a laser printer sing and dance.
See How to connect a Raspberry Pi to a serial USB port with Python from the terminal
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Raspberry Pi can be used to interface with the real world from its GPIO, for example, by controlling a stepper motor. You can also use Raspberry Pi to dialog with some devices—like Arduino—by using a serial USB port. In this guide, I’ll show you how to connect your Raspberry Pi to a serial USB port and read its values with Python from the terminal (without a desktop environment). For this purpose, we’ll use Pyserial and its terminal tool.