128 (0-127), 95 printable, 33 control (for 7 bit ascii that is a
through back to teletypes.)
ISO 8859-1 has 256 characters.
From 128 up to 255 we find extra symbols for other languages and
regions. Ascci 128 = € for instance and 255 = ÿ.
Of course there are many 8-bit standars, windows-1250, for an
example.