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FED-STD-1012 1977 Edition, August 11, 1977
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TELECOMMUNICATIONS: CHARACTER STRUCTURE AND CHARACTER PARITY SENSE FOR PARALLEL-BY-BIT DATA COMMUNICATION IN THE AMERICAN NATIONAL STANDARD CODE FOR INFORMATION INTERCHANGE
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This standard specifies the character structure and character parity sense for parallel-by-bit data communication using the American National Standard Code for Information Interchange (ASCII).

Federal telecommunication standards are to facilitate interoperability between telecommunication facilities and systems and compatibility of these systems at the computer-communications interface with data processing equipment.

This standard is to be used by Federal agencies with other Federal Standards or design specifications describing functional, mechanical and procedural characteristics as necessary to achieve interoperability. The parity sense required for 8-level perforated paper tape is not a part of this standard.