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There are a few videos (well, nearly two hundred) on YouTube: https://www.youtube.com/user/moshe5760 https://www.youtube.com/user/moshe5760 You'll learn how to
by throwawaybutwhy 6y ago
There are a few videos (well, nearly two hundred) on YouTube: https://www.youtube.com/user/moshe5760 https://www.youtube.com/user/moshe5760
You'll learn how to set up a z13 mainframe in your basement, how to use an emulator (Hercules) with open source MVS on your Linux/Mac/Windows machine, where to find the manuals. Very engaging and fun overall.
Back to your question: it's a whole another world. Mainframes are reliable, expensive as h&ll, thoroughly backward compatible, virtualized before anybody else, and still the invisible mainstay of our economy and whatnot (banks, insurance companies, DoD, airlines).