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Describe Far-Eastern DOS terminal support.

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Eli Zaretskii 1999-04-08 12:17:13 +00:00
parent fb7f676dd3
commit 36e2096934
1 changed files with 23 additions and 12 deletions
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@ -531,18 +531,27 @@ codepage for Emacs to use by setting the variable @code{dos-codepage} in
your init file.
@cindex language environment, automatic selection on @r{MS-DOS}
Multibyte Emacs supports only certain DOS codepages, those that encode
a single ISO 8859 character set, and it knows which ISO character set
based on the codepage number. Emacs automatically creates a coding
system to support reading and writing files that use the current
codepage, and uses this coding system by default. The name of this
coding system is @code{cp@var{nnn}}, where @var{nnn} is the codepage
number.@footnote{The standard Emacs coding systems for ISO 8859 are not
quite right for the purpose, because typically the DOS codepage does not
match the standard ISO character codes. For example, the
letter @samp{@,{c}} (@samp{c} with cedilla) has code 231 in the standard
Latin-1 character set, but the corresponding DOS codepage 850 uses code
135 for this glyph.}
Multibyte Emacs supports only certain DOS codepages, those which can
display Far-Eastern scripts, like the Japanese codepage 932, and those
that encode a single ISO 8859 character set.
The Far-Eastern codepages can directly display one of the MULE
character sets for these countries, so Emacs simply sets up to use the
appropriate terminal coding system that is supported by the codepage.
The special features described in the rest of this section mostly
pertain to codepages that encode ISO 8859 character sets.
For the codepages which correspond to one of the ISO character sets,
Emacs it knows which ISO character set is that based on the codepage
number. Emacs automatically creates a coding system to support reading
and writing files that use the current codepage, and uses this coding
system by default. The name of this coding system is
@code{cp@var{nnn}}, where @var{nnn} is the codepage number.@footnote{The
standard Emacs coding systems for ISO 8859 are not quite right for the
purpose, because typically the DOS codepage does not match the standard
ISO character codes. For example, the letter @samp{@,{c}} (@samp{c}
with cedilla) has code 231 in the standard Latin-1 character set, but
the corresponding DOS codepage 850 uses code 135 for this glyph.}
@cindex mode line @r{(MS-DOS)}
All the @code{cp@var{nnn}} coding systems use the letter @samp{D} (for
@ -550,6 +559,8 @@ Latin-1 character set, but the corresponding DOS codepage 850 uses code
system and the default coding system for file I/O are set to the proper
@code{cp@var{nnn}} coding system at startup, it is normal for the mode
line on MS-DOS to begin with @samp{-DD\-}. @xref{Mode Line}.
Far-Eastern DOS terminals do not use the @code{cp@var{nnn}} coding
systems, and thus their initial mode line looks like on Unix.
Since the codepage number also indicates which script you are using,
Emacs automatically runs @code{set-language-environment} to select the