Oh, the days of the ASCII Code page 437
https://upload.wikimedia.org/wikipedia/commons/f/f8/Codepage...
https://upload.wikimedia.org/wikipedia/commons/f/f8/Codepage...
It's still all CP437 internally.
http://www.unicode.org/L2/L2017/17435r-terminals-prop.pdf
They have been implemented recently in the Pragmata Pro font I use, which seems to just keep adding glyphs