There is an article on the 2600 archives (and replicated elsewhere) on how to break into VM/370 systems but really requires you to know the maint password. I have (bows head in shame) 'hacked' into a system. This was open to the internet and was running an ADCD system and they had not changed the default passwords, including ibmuser. All I did was take a look around and then log out but, for me, that was a very large hole in their security (was not a commercial company but still....)
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