extended ASCII - Computer Definition
The second half of the ASCII character set (characters 128 through 255). Extended ASCII symbols are different for each font. The standard font in DOS uses extended ASCII for foreign language letters as well as characters that make up simple charts and diagrams (see ASCII chart). The Macintosh allows extended ASCII characters to be user defined. The extended ASCII characters in most Windows fonts are defined by ANSI for foreign languages, and the Character Map utility can be used to view them.