OT: who knows anything about mainframes?

[Ben98SentraSE]

I may very well be getting a job at a credit union that has one. If I had to guess based on the little I was told about it in the interview and searching on Unisys's site, I think it is a Unisys e-@action ClearPath NX Enterprise Server. I know basically nothing about mainframes. Anybody have places to point me to learn basic stuff about mainframes that would be applicable to this system? The page for it is here:

http://www.unisys.com/hw/servers/clearpath/nx/

Wonder how Seti would run on it? hehe