glass = G = glassfet

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.

--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.

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