They are reusable.

Old hardware can be used for doing electronics just like the Arduino, Raspberry Pi, and etc. Parallel port can be used for digital interfacing.

pcduino

You can use the joystick port for analog input just like the Arduino. (less accurate though). The serial port allows you to do communication.

SUNP0003 


Some vga cards even have i2c interfaces















http://www.instructables.com/id/Electronic-Guides/

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