cobol2.hlp (Table of Contents; Topic list)
DATACOMPRESS Details (↑ Format of Your Data Files)
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     The only value that can be specified for Micro Focus data compression
     is 1. Values in the range 128 through 255 indicate user-defined
     compression routines
 
     You need specify data compression only when creating the file.
     Subsequently, the data compression will be detected when the
     file is opened.
 
     To get data compression on an individual file, use $SET statements
     in your source so that this directive is in effect only for the
     part of the source containing the file's SELECT statement.
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