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From: "Alfred M. Szmidt" <ams@gnu.org>
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Subject: Re: prettify symbols question
Date: Fri, 13 Nov 2020 05:15:48 -0500
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To: Eli Zaretskii <eliz@gnu.org>
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   > The Lisp Machine character set

   Emacs doesn't support such an encoding/charset, does it?  Maybe it
   should?

No, not yet.  I can see about doing that.

   Is this character set documented somewhere?  The Lisp Machine
   Manual I have seems to say that \210 is BS or Overstrike, not LAMBDA
   (https://tumbleweed.nu/r/lm-3/uv/chinual.html#The-Character-Set).

That is how the Lisp Machine sees things (there is an implicit
conversion of the files from the host to the Lisp Machine when read
over Chaosnet); e.g, newline is #o215, but when files are stored on a
Unix host they have been translated so that newline #o215 becomes
#o12, similar for tab, etc so things are viewable on ASCII systems.

So there are two encodings, one is native to the Lisp Machine (where
#o215 is left as is), and the other one for UNIX (where #o215, etc,
are translated).