EO, or Eight Ones, is an 8-bit
EBCDIC
Extended Binary Coded Decimal Interchange Code (EBCDIC; ) is an eight- bit character encoding used mainly on IBM mainframe and IBM midrange computer operating systems. It descended from the code used with punched cards and the corresponding ...
character code
Character encoding is the process of assigning numbers to graphical characters, especially the written characters of human language, allowing them to be stored, transmitted, and transformed using digital computers. The numerical values that ...
represented as all ones (
binary
Binary may refer to:
Science and technology Mathematics
* Binary number, a representation of numbers using only two digits (0 and 1)
* Binary function, a function that takes two arguments
* Binary operation, a mathematical operation that ta ...
1111 1111,
hexadecimal FF). It is used for synchronisation purposes, such as a time and media filler.
When translated from the EBCDIC character set to
code pages with a
C1 control code set
The C0 and C1 control code or control character sets define control codes for use in text by computer systems that use ASCII and derivatives of ASCII. The codes represent additional information about the text, such as the position of a cursor, ...
, it is typically mapped to hexadecimal code 9F, in order to provide a unique character mapping in both directions.
See also
*
0xFF
255 (two hundred ndfifty-five) is the natural number following 254 and preceding 256.
In mathematics
Its factorization makes it a sphenic number. Since 255 = 28 – 1, it is a Mersenne number (though not a pernicious one), and the fourth such nu ...
*
Delete character
The delete control character (also called DEL or rubout) is the last character in the ASCII repertoire, with the code 127. It is supposed to do nothing and was designed to erase incorrect characters on paper tape. It is denoted as in caret notat ...
References
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Control characters