( fam1 -- fam2 )

Modify the implementation-defined file access method fam1 to additionally select a "binary", i.e., not line oriented, file access method, giving access method fam2.

Some operating systems require that files be opened in a different mode to access their contents as an unstructured stream of binary data rather than as a sequence of lines.

The arguments to READ-FILE and WRITE-FILE are arrays of character storage elements, each element consisting of at least 8 bits. The committee intends that, in BIN mode, the contents of these storage elements can be written to a file and later read back without alteration.