I dunno where they all went...  In my case, I had a
competing Smith-Corona
 daisy-wheen typewriter with a female DB9 attachment on the back that hooked 
This reminds me,...
Somewhere I have an electronic tyewriter, It's portable, battery operated
(!), and has a Centroinics port on the side so you can use it as a
printer. The mechanism? A wide-carriage (8" or so) version of that little
ballpoint pen plotter that we discussed recently, you know the
CBM1520/CGP115/etc one). One odd pen i have for it once contained
white-out type correction fluid and and could be used to erase characters
 from the output (!). 
-tony