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How does one go about learning all the ancillary skills? I mean there's COBOL, sure, but then there's the system architecture of a mainframe, something for which there is precious little documentation and learning material on.

Some doddling around with an (almost certainly illicitly acquired) copy of IBM Z/OS on an emulator almost proved to me that no free resources exist.

That's a really good question that I haven't had to think about for a while - I've had some kind of mainframe access my entire career, although I've actively tried to avoid doing that kind of work too frequently. It's just not something I've ever enjoyed.

I'll ask around with my mainframe vets and get back to you. There has to be something out there.

I would be very grateful - a new (old?) way of thinking about computing is very interesting to me.

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