glass tty

glass tty /glas T-T-Y/ or /glas ti'tee/ n.  A terminal
   that has a display screen but which, because of hardware or
   software limitations, behaves like a teletype or some other
   printing terminal, thereby combining the disadvantages of both:
   like a printing terminal, it can't do fancy display hacks, and like
   a display terminal, it doesn't produce hard copy.  An example is
   the early `dumb' version of Lear-Siegler ADM 3 (without cursor
   control).  See {tube}, {tty}; compare {dumb terminal},
   {smart terminal}.  See "{TV Typewriters}" (Appendix
   A) for an interesting true story about a glass tty.