This page serves as a timeline to show when analog devices were first made with digital circuits and systems. * 1642: Blaise Pascal invents the mechanical calculator. This calculator could work in base 6, 10, 12 and 20. * 1820: Thomas de Colmar invents the arithmometer. Its production release in 1851 marks the beginning of the mechanical calculator industry. * 1822: Difference engine: First mechanical computer created by Charles Babbage. * 1837: Analytical engine: Mechanical general-purpose computer created by Charles Babbage. * 1843: Fax machine: a scanning, rasterized, digital replacement for the vectorized, analog telautograph."The Secret Life of the Fax Machine" by Tim Hunkin * 1847 (?) : piano roll: a digital recording of which notes were played. * 1877: gramophone record: an a