American National Standards Institute

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ANSI (typically pronounced as an acronym "ann-see") is the American National Standards Institute, a large engineering standards organisation with headquarters in Washington D.C and web site ansi.org. It was founded in 1918.

It is responsible for a number of important standards in computing, including:

  • ANSI Standard C, usually called ANSI C, published as X3.159-1989.
  • ANSI Standard Fortran, usually called Fortran 66, published as ASA X3.9-1966.
  • ANSI Standard Cobol standards in 1968, 1974, and 1985.
  • Expansion of 7-bit ASCII character set beginning in 1963.

As well as many other general engineering standards with application to historical computers:

  • The threads of inch-based machine screws including UNC (coarse) and UNF (fine), used in very many US-designed computers.