Re: new coding system (was: Re: prettify symbols question)

[Alfred M. Szmidt]

   > From: "Alfred M. Szmidt" <ams@gnu.org>
   > Cc: emacs-devel@gnu.org
   > Date: Fri, 13 Nov 2020 12:11:18 -0500
   > 
   > These default coding systems were tried to encode text
   > in the buffer `lispm-char-test.text':
   >   (lispm-unix (1 . 0) (59 . 1) (117 . 2) (175 . 3) (233 . 4) (291 . 5)
   >   (349 . 6) (407 . 7) (465 . 4194184) (523 . 4194185) (581 . 4194186))
   > However, each of them encountered characters it couldn't encode:
   >   lispm-unix cannot encode these: ^@ ^A ^B ^C ^D ^E ^F ^G \210 \211 ...
   > 
   > (where ^@ etc are #o0, #o1, etc and #o210 ...)

   Is this the encoding on Unix systems?  If so, maybe try without
   mapping characters below ASCII 128, I'm not sure this is supported in
   an ASCII-compatible encoding.

I am not sure I understand.  On unix #o0 maps to the MIDDLE DOT, #o1
to DOWNWARDS ARROW, etc.  The Lisp Machine character set isn't
compatible with ASCII -- the control characters have a entierly
diffierent function.  As I understood it, the charmap/charset is a
mapping from UCS-4 Unicode to whatever is on the target?