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From: jnc@mercury.lcs.mit.edu (Noel Chiappa)
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Subject: [TUHS] Re: vi in cooked mode?
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    > From: Diomidis Spinellis

    > I remember being told back in the 1980s that vi would set the terminal
    > to "cooked mode" when vi was in "insert mode", so as to reduce expensive
    > context switching for each character typed.
    > ...
    > However, I can't find such evidence even as far back as BSD 1.

Maybe you're thinking of Multics Emacs, which had such a capability:

  https://multicians.org/mepap.html

  Noel