alternate charset

Corinna Vinschen
Thu Sep 24 08:27:00 GMT 2009

On Sep 23 21:42, Andy Koppe wrote:
> 2009/9/23 Corinna Vinschen:
> > The alternate
> > charset, typically only used for the graphical characters anyway,
> > could be either CP 437, or what GetOEMCP() returns.
> I think the alternate charset should be fixed to CP437. That's what
> PuTTY and mintty do, and here's the relevant line from
>, the man page for the Linux
> console:
> ESC ( U 		Select null mapping - straight to character ROM
> And from the CP437 wikipedia page:
> "Today, [CP437] is still the primary font in the core of any EGA and
> VGA compatible graphic card, i.e. the text you can see on screen when
> a PC reboots, before any other font can be loaded from a storage
> medium, is rendered with this code page."
> (Btw, the "alternate charset" is a PC-specific thing. vt100 and xterm
> don't have it.)

Erm?  AFAIK VT220 terminals already had multiple fonts, including a
font with the typical graphical frame and block characters.  There
were ESC sequences to switch between those fonts to allow nice forms
and sheet display.


Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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