I would be interested in how you got 360 era DL/1 (the only one AFAIK in the public domain) to talk to an entry sequenced 'OSAM' file. ?The MVS versions were definitely not unlicensed. The ISAM to VSAM key sequenced file I can understand with the ISAM to VSAM bridge. I don't ever recall that the pre-IMSVS DL/1 code ever even understanding VSAM. Especially the mess that was OSAM - custom open, dynamic DEB built, TCLOSE every write.
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