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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: prettify symbols question
Date: Fri, 13 Nov 2020 15:47:43 +0200
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> From: "Alfred M. Szmidt" <ams@gnu.org>
> Cc: emacs-devel@gnu.org
> Date: Fri, 13 Nov 2020 08:31:42 -0500
> 
> (define-charset 'lispm
>   "LISPM"
>   :short-name "LISPM"
>   :ascii-compatible-p nil
>   :code-space [0 255]
>   :map "LISPM")
> 
> (define-coding-system 'lispm
>   "Lisp Machine encoding"
>   :coding-type 'charset
>   :mnemonic ?L
>   :charset-list '(lispm))
> 
> So that sorts it out for the native one, but what should be done for
> the Unix friendly mapping?  LISPM-ASCII, and similar as above?

Something like that.  Although I'm not sure about the name.  But why
do you need the native variant?  If we only need one charset, for how
it is seen on Unix, we could call that 'lispm'.