Off topic - Mainframe introduction guide ??

[~~ The Nightcrawler ~~]

I have recently acquired some job responsibilities that require a
basic understanding of mainframe computing - having "grown-up" in
client server, I am concerned I am entering a strange new/old world.
Anyone know of a plain-English intro book or site that will give me
some fundamentals ?

Thanks,

~~NC~~

 

[Chuck]

Your local library likely has books on these antiques! (G)
Most of the documentation is unique to a mainframe system and a mfr.
Oh, for the days of COBAL! (ECCCH!)