The American Standard Code for Information Interchange (ASCII) is a character-encoding scheme based on the ordering of the English alphabet. ASCII codes represent text in computers, communications equipment, and other devices that use text.Character tables: ASCII tablethe 128 ASCII character table ASCII extended setsthe 256 character ASCII extended sets used in the IBM PC (MS-DOS) or in the Apple Mac ANSI table (ISO 8859-1)the 256 ANSI character table used by Windows