For my new project I am having to learn all about Mainframe Computers, the level of knowledge that has seen me through a lifetimes career in IT; "they are big blue things" is now way out of date, not least because as I found out the other day they are now painted black.
So I found these interesting articles on Mainframe Computers 'The Gen Xer's Guide to Mainframes.
Part 1 - http://www.ibmsystemsmag.com/mainframe/enewsletterexclusive/20410p1.aspx
Part 2 - http://www.ibmsystemsmag.com/mainframe/enewsletterexclusive/20679p1.aspx
Part 3 - http://www.ibmsystemsmag.com/mainframe/enewsletterexclusive/20924p1.aspx