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6.6.5.2 The point at which the file operations "rewrite", "put", "reset", and "get" are actually performed is implementation-defined.

Irie Pascal implements lazy I/O (i.e. input operations are performed at the latest opportunity and output operations are performed at the earliest opportunity) in order to facilitate interactive terminal input and output. The file operations are performed as specified below:

• rewrite - the file is opened but the file buffer is empty.
• put - the contents of the file buffer are appended to the file.
• reset - the file is opened, but the file buffer is not filled until it is accessed.
• get - If the file buffer is full then the file buffer is emptied to make room for the next file value (NOTE: In this case no I/O is actually performed). If the file buffer is empty then the next data value is skipped (i.e. read and ignored). The file buffer remains empty.