If anyone wants to play with UTS--the version I'm running has sources that indicate it's pretty much a v7--you can connect to it at https://mvsevm.fsf.net, resize your window so the terminal is 80x25, pick option 11 (VM/370), hit enter, and then after the logo goes away type "DIAL UTS".

The passwords are findable via a web search for something like "uts vm/370 password" in that I have not changed them from the defaults.  If you manage to break out of UTS into VM, and from there into Hercules, and from that to the physical host, and then from there compromise my network, I'd like to know how you did it.  If on the other hand you're going to mine bitcoin with my UTS VM guest, you can cost me literally dozens of cents a month in electricity, probably.

I have not played with the 3270 libraries, but they exist.  The two full-screen 3270 utilities I am aware of are ned and man.  Ned's really rather a lovely little editor.  Other than that it feels a lot like a stock v7, but of course the terminal is linemode.  The command to log out is "logoff".

Adam