Eight Ones

EO, or Eight Ones, is an 8-bit EBCDIC character code represented as all ones (binary 1111 1111, hexadecimal FF). It is used for synchronisation purposes, such as a time and media filler.[1]

When translated from the EBCDIC character set to code pages with a C1 control code set, it is typically mapped to hexadecimal code 9F, in order to provide a unique character mapping in both directions.[2][3]

See also

References
  1. IBM. "Appendix G-1. EBCDIC control character definitions". Character Data Representation Architecture. Archived from the original on 2018-09-11.
  2. Umamaheswaran, V.S. (1999-11-08). "3.3 Step 2: Byte Conversion". UTF-EBCDIC. Unicode Consortium. Unicode Technical Report #16.
  3. Steele, Shawn (1996-04-24). cp037_IBMUSCanada to Unicode table. Microsoft/Unicode Consortium.
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