You want to look at this manual. 
https://vt100.net/docs/vt220-rm
Vt100 doesn't support soft char sets but vt220 on does.


Wayne


> On Jan 5, 2023, at 10:46 PM, David Griffith via cctalk 
> <cctalk@classiccmp.org> wrote:
> 
> 
> I'm trying to figure out how to created and load a "soft character set" into 
> a vt220 terminal.  These documents: 
> https://vt100.net/shuford/terminal/dec_vt220_codes.txt, and 
> https://vt100.net/docs/vt510-rm/DECDLD.html, seem to talk about how to do it, 
> but I don't follow this well.  I'm guessing the fonts are made up of escape 
> sequences.  Then I guess they are loaded by simply printing them to the 
> terminal.  If that's the case, where are the examples of such sequences?
> 
> Playing around with vttest, there's an option to "Test Soft Character Sets" 
> in the "VT220 Tests" menu.  But I get the error message "You did not specify 
> a font-file with the -f option".  Where can I find examples of that file?
> 
> Putting these together, I'm guessing what vttest wants is a file containing 
> sequences described in those two documents.  So, where do I go from here?
> 
> 
> -- 
> David Griffith
> d...@661.org
> 
> A: Because it fouls the order in which people normally read text.
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