What extended ASCII character set uses 0x9D?

[Gregory Ewing]

Chris Angelico wrote:
> a naive ASCII upper-casing wouldn't produce 0x81 either - if it did, it
> would also convert 0x21 ("!") into 0x01 (SOH, a control character). So
> this one's still a mystery.

It's unlikely that even a naive ascii upper/lower casing algorithm
would be *that* naive; it would have to check that the character
appeared to be a letter before changing it.

You might expect bytes >= 0x80 to be classed as non-letters by
that test, but what if it ignores the top bit or assumes it's
a parity bit to be left alone? What do you get under those
assumptions?

-- 
Greg