contraption which recorded on  
         Punch
Cards
         Spools of Wire
         Magnetized Cardboard
         Photosensitive Film
         Clear plastic disks
         Audio Cassettes
         VHS Cassettes
         encased 1/2 size CDR's
         ...Fluidic Logic Gates
   . . . .
   I think this thread mainly illustrates (with great
   examples, THANKS) the difference between what's feasible
   and what's marketable.  Let's face it, a good engineer
   can get anything to do anything else but when its'
   considered a success is when a million or more people
   can do it with a single push of a button.  (And for less
   than a weeks salary).
John A.
(check out the price of those VidLP's  Yike)