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The ASCII character set defines 128 characters (0 to 127 decimal, 0 to 7F hexadecimal, and 0 to 177 octal). This character set is a subset of many other character sets with 256 characters, including the ANSI character set of MS Windows, the Roman-8 character set of HP systems, and the IBM PC Extended Character Set of DOS, and the ISO Latin-1 character set used by Web browsers. They are not the same as the EBCDIC character set used on IBM mainframes. The Control Characters The first 32 values are non-printing control characters , such as Return and Line feed . You generate these characters on the keyboard by holding down the Control key while you strike another key. For example, Bell is value 7, Control plus G, often shown in documents as ^G. Notice that 7 is 64 less than the value of G (71); the Control key subtracts 64 from the value of the keys that it modifies. For the text version of the following tables, click Control Characters and Printing Characters. Control Characters