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During the late 1970s and 1980s, versions of C were implemented for a wide variety of [[mainframe computer]]s, [[minicomputer]]s, and [[microcomputer]]s, including the [[IBM PC]], as its popularity began to increase significantly.
In 1983 the [[American National Standards Institute]] (ANSI) formed a committee, X3J11, to establish a standard specification of C. X3J11 based the C standard on the Unix implementation; however, the non-portable portion of the Unix C library was handed off to the [[IEEE]] [[working group]] 1003 to become the basis for the 1988 [[POSIX]] standard. In 1989, the C standard was ratified as ANSI X3.159-1989 "Programming Language C". This version of the language is often referred to as [[ANSI C]], Standard C, or sometimes '''C89'''.
In 1990 the ANSI C standard (with formatting changes) was adopted by the [[International Organization for Standardization]] (ISO) as ISO/IEC 9899:1990, which is sometimes called '''C90'''. Therefore, the terms "C89" and "C90" refer to the same programming language.
ANSI, like other national standards bodies, no longer develops the C standard independently, but defers to the international C standard, maintained by the working group [[ISO/IEC JTC1/SC22]]/WG14. National adoption of an update to the international standard typically occurs within a year of ISO publication.
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