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Invoking Exclusion in Assembler Macros

It may be necessary to force exclusion regardless of user JCL or because you need the compressed data set attributes or the compressed data. You can disable CA Compress processing at OPEN, CLOSE, OBTAIN, RDJFCB, or catalog management by loading X'DEDFADE1' into Register 15 before issuing the macro.

It is your responsibility to use this facility consistently. Be careful to exclude both OPEN and CLOSE or neither, and be sure to treat RDJFCB and OPEN TYPE=J consistently. Failure to observe this restriction leads to abends and other unpredictable results.