ISO/IEC 10279:1991/Amd 1:1994 Preview
Modules and single character input enhancement
Establishes the syntax of programs written using individual character input, or modules, or both; the semantic rules for interpreting the meaning of a BASIC program that uses individual character input, or modules, or both; errors and exceptional circumstances to be detected and also the manner in which such errors and exceptional circumstances are to be handled.
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ISO/IEC 10279:1991/Amd 1:1994