Overview#Extended characters, generally, are those which are not in the standard ASCII character set, which uses 7-bit characters and thus has values 0 to 127.
ASCII Codes 0 to 31 and 127 are non-printing control characters, while codes 32 to 126 match the keys on a US keyboard ("a", "A", etc.).
Using 8 Bits Gives You an Extra 96 Characters#Since computers store characters in 8-bits, many uses have been found for the extra 128 values, most commonly for European characters such as A with Grave accent (À).
And actually, only 96 of the codes are used
- values 128 to 159 are not assigned Graphics, just as 0 to 31 are reserved for non-printing control characters.