David Griffith wrote:
  This paper tape fiddling made me wonder if anyone ever
made a cassette
 tape interface that emitted RS232 signals and looked to the computer like
 a paper tape reader/writer. 
Yes, we had some at Westfield College, University of London in the
early 1980s.  I can't remember the make/model, but I think I may
have one in the loft (will take a look).  It was a modified audio
cassette recorder with a 25-pin "D" connector for the serial port.
--
John Honniball
coredump at gifford.co.uk