what is a mainframe? how does it work? what does it do? what is the user interface of a mainframe?

This video shows the following:

1. what is a mainframe
2. what are they used for
3. what is the user intface today and how was it before
4. what are terminals
5. how programmers interact wit the mainframe with the example of IBM's MVS 3.8
6. What mainframes cannot be used for.

This video is about 20 minutes long.


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