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The Pascal Standard (ISO/IEC 7185) says that some features of the Pascal language are implementation-defined. ISO/IEC 7185 further says that each implementation (called a processor by ISO/IEC 7185) must provide a definition of all implementation-defined features.

Below are links to definitions of how Irie Pascal handles implementation-defined features. Each definition has the following format:

First the official description of the feature is taken from ISO/IEC 7185 and displayed in red. This is followed by a simplified description, if the official description is unclear or requires the reader to have a copy of ISO/IEC 7185. Finally a statement describing how Irie Pascal handles the feature is at the end.

• String-elements
• Provision of tokens and delimiting characters
• Size and precision of real values
• Character set
• Ordinal values of characters
• Characters prohibited from text files
• When I/O is performed
• Value of "maxint"
• Accuracy of real operations and functions
• Default value of TotalWidth for integer-type
• Default value of TotalWidth for real-type
• Default value of TotalWidth for boolean-type
• Number of digits written in exponents
• Use of "e" or "E" as exponent character on output
• Case of characters used on output of boolean values
• Effect of built-in procedure "page"
• Binding of file-type program-parameters
• Effect of "reset" and "rewrite" on "input" and "output"