Sorry the info didn’t help. I’ve never used the alternate character set. I 
recalled seeing something years ago about double width or double height 
characters that suggested use of an alt char set. 

Unfortunately I don’t recall whether it concerned VT100 or a HP terminal.

Info on URWID indicates that it supports ncurses, but cannot verify if it uses 
alt char set.

However, the following might be more relevant:  NCURSES Extended Characters 
Quick Reference Chart … 
 It includes c code that uses curses to display alt char set.


> On Apr 12, 2015, at 8:49 AM, anatoly techtonik <techto...@gmail.com> wrote:
> On Sun, Apr 12, 2015 at 2:06 PM, Richard S. Gordon <rigo...@comcast.net 
> <mailto:rigo...@comcast.net>> wrote:
> For a description of the standard and alternate character sets you might 
> checkout:
> http://en.wikipedia.org/wiki/VT100 <http://en.wikipedia.org/wiki/VT100>
> No info. 
> http://vt100.net/docs/vt100-tm/ek-vt100-tm-002.pdf 
> <http://vt100.net/docs/vt100-tm/ek-vt100-tm-002.pdf>
> Looks like search doesn't work in this PDF. Couldn't find "alternate" inside.
> http://www.in-ulm.de/~mascheck/various/alternate_charset 
> <http://www.in-ulm.de/~mascheck/various/alternate_charset> 
> Seen that. It assumes a lot of knowledge about terminals and their problems, 
> and I have no idea what the problem domain of this text is about.
> You might also get more insight by directly contacting Thomas E. Dickey. He 
> has maintained ncurses since 1995-1996. His record keeping is highly detailed.
> I just need a simple answer when it is used, why it is needed and how it 
> looks like compared to non-alternate charset.

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