<P> Apple Computer introduced their own eight - bit extended ASCII codes in Mac OS, such as Mac OS Roman . </P> <P> Digital Equipment Corporation (DEC) developed the Multinational Character Set, which had fewer characters but more letter and diacritic combinations . It was supported by the VT220 and later DEC computer terminals . This later became the basis for other character sets such as the Lotus International Character Set (LICS), ECMA - 94 and ISO 8859 - 1 . </P> <P> Eventually, ISO released this standard as ISO 8859 describing its own set of eight - bit ASCII extensions . The most popular is ISO 8859 - 1, also called ISO Latin 1, which contained characters sufficient for the most common Western European languages . Variations were standardized for other languages as well: ISO 8859 - 2 for Eastern European languages and ISO 8859 - 5 for Cyrillic languages, for example . </P> <P> One notable way in which ISO character sets differ from code pages is that the character positions 128 to 159, corresponding to ASCII control characters with the high - order bit set, are specifically unused and undefined in the ISO standards, though they had often been used for printable characters in proprietary code pages, a breaking of ISO standards that was almost universal . </P>

What is the most common extended ascii set