What extended ASCII character set uses 0x9D?

[Paul Rubin]

John Nagle <nagle at animats.com> writes:
> Since, as someone pointed out, there was UTF-8 which had been
> run through an ASCII-type lower casing algorithm

I spent a few minutes figuring out if some of the mysterious 0x81's
could be from ASCII-lower-casing some Unicode combining characters, but
the numbers didn't seem to work out.  Might still be worth looking for
in some other cases.