Tristan Perich pushed chiptune to the limits with his 2010 1-Bit Symphony. The album is stored in a standard crystal case. When a switch is on, a battery powers a microchip which outputs music through a digital pin to a headphone jack. One button to skip tracks, one potentiometer to control volume. I adore the minimalism.
Mine doesn't play “correctly” anymore. I hope its production is unique.
Comes with a leaflet with the complete sources:
