Hello Robert,
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FCOBOL does not support VSAM datasets to my knowledge. But you can use the VSAMIO package that Jay Moseley wrote for the MVT COBOL compiler. You may go to this address: https://geronimo370.nl/vm6pext/dos-vs/ and download the VSAMIO zip at the bottom of the page to get a job that installs Jay's assembler module. The archive contains a job to assemble VSAMIO on the 5-pack, an other one to catalog the VSAMIO copy books, and an example of a FCOBOL program that loads records into a VSAM KSDS cluster. There are many examples of VSAMIO usage on Jay's site. You may e-mail me for more info if you wish.
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Best regards,
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Rene FERLAND, Montreal
René Ferland