Phreakmonkey uploaded a video to YouTube that gives a demonstration of the 45 years old Livermore Data Systems "Model A" Acoustic Coupler Modem. This antique modem is still functional and can still be used with modern computer systems.
How modems worked in 1964 (video)
Posted on Saturday, May 30 2009 @ 7:05 CEST by Thomas De Maesschalck