FWIW, this book ("Fake Your Way Through Minis and Mainframes" by Bob DuCharme) provides a good short user-level introduction to z/OS (and VM, and VMS, and...):

FWIW, this book ("Fake Your Way Through Minis and Mainframes" by Bob DuCharme) provides a good short user-level introduction to z/OS (and VM, and VMS, and...): http://www.snee.com/bob/opsys/fullbook.pdf http://www.snee.com/bob/opsys/fullbook.pdf