Glass tty
/glas T-T-Y/ or /glas ti'tee/ 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" for an interesting true story about a glass tty.
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