He hacked up the firmware of a dotmatrix printer to send it commands from his Atari 2600 or 80286 Compaq to make music. "Sound is generated by the print head pins striking the paper and the sound is picked up by a tie-clip mic on the print head. By adjusting the frequency of the printing process in software, different pitches can be played (with about a two octave range.)"
He hacked up the firmware of a dotmatrix printer to send it commands from his Atari 2600 or 80286 Compaq to make music. "Sound is generated by the print head pins striking the paper and the sound is picked up by a tie-clip mic on the print head. By adjusting the frequency of the printing process in software, different pitches can be played (with about a two octave range.)"
He thoughtfully includes all the source you need to do this to your own Epson LQ-500! https://www.qotile.net/dotmatrix.html