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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 03:27:17 -0500
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   >    If the above doesn't work, then maybe it _is_ related to encoding.
   >    What does the mode line say about 'buffer-file-coding-system when' you
   >    visit this file?
   > 
   > So when the buffer-file-coding-system is utf-8-unix everything works
   > (where also the sequence is not acted on in comments).  But when the
   > buffer is raw-text-unix, it does not work for #o210, but works for say
   > #o10.  Some multi-byte thing going on?

   Yes, raw-text means the buffer includes raw bytes, not characters.
   Emacs doesn't do anything useful with raw bytes above 127, and in
   particular doesn't interpret them as characters.

Do you have any ideas on what a good coding system would be for this?
utf-8 is obviously wrong.  The char. set is just 8-bit, or should I
write a coding system?