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Aside from the physical encoding, note the conventions for IBM tape file sequence and labeling:

https://www.ibm.com/docs/en/zvse/6.2?topic=SSB27H_6.2.0/fa2m...

You can bypass default label assumptions and label processing using JCL directives like BLP, NL, etc.

When I was in mainframe operations and at times ran the Production Control Center (triage), I rescued some systems from being rerun due to clobbered labels by altering JCL.

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This is very helpful. I’m guessing you have a copy of the Brown/Blue => Blue/Brown book.

I'm not familiar with that description. I worked as a 370 series (370/3033/308x/309x) OS/MVS computer operator in the 80s, before programming.

I worked as an 370 ACP/TPF Assembly Language Programmer in the 80s. I think this is referring to Gary DeWard Brown who wrote books about assembly language and JCL for example. Don't remember if they were blue though.

Gary deWard Brown is the author and hence the name. If I recall, he also describes utilities like IEBGENER, IEBCOPY and so on.

One copy of the book on Amazon was over $100.

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