Extended ASCII is a repertoire of character encodings that include (most of) the original 96 ASCII character set, plus up to 128 additional characters. There is no formal definition of "extended ASCII", and even use of the term is sometimes criticized, because it can be mistakenly interpreted to mean that the American National Standards Institute (ANSI) had updated its ANSI X3.4-1986 standard to include more characters, or that the term identifies a single unambiguous encoding, neither of which is the case.

The ISO standard ISO 8859 was the first international standard to formalize a (limited) expansion of the ASCII character set: of the many language variants it encoded, ISO 8859-1 ("ISO Latin 1") – which supports most Western European languages – is best known in the West. There are many other extended ASCII encodings (more than 220 DOS and Windows codepages). EBCDIC ("the other" major character code) likewise developed many extended variants (more than 186 EBCDIC codepages) over the decades.

The technology has largely been rendered technically obsolete by Unicode, which has code points for all the characters encoded in the various attempts to extend ASCII. All modern operating systems use this technology. Nevertheless, the topic remains important in the history of computing.
Based on the provided text, what technology rendered Extended ASCII obsolete?
Unicode rendered extended ASCII obsolete.