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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: new coding system (was: Re: prettify symbols question)
Date: Sat, 14 Nov 2020 16:24:22 +0200
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To: "Alfred M. Szmidt" <ams@gnu.org>
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> 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.