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A comment on Show HN: Connecting an IBM 3151 terminal to a mainframe [video]. Parent comment

Re:Show HN: Connecting an IBM 3151 terminal to a mainframe [... by miki123211 on Tuesday April 08, 2025 @02:29PM (#43624997)
That, and datasets, which are not really hierarchical.

Yes there's a hierarchy (with . as a separator), but it's more naming convention than a description of the underlying filesystem. You can create projects.foo.code.bar without having any entity (like a Unix directory) for projects.foo first.

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Re:Show HN: Connecting an IBM 3151 terminal to a mainframe [... by rbanffy on Wednesday April 09, 2025 @01:41PM (#43634943)
MCP, the only OS older than z/OS in active maintenance, even more alien than IBM’s, does more or less the same. It had at one time a hierarchical file system, but at some point they decided it was pointless and adopted a naming convention instead.

I was trying to get around it on SimH, with the B5500 version. Definitely deserves the name.

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