Hi Raghu thanks for your reply!

Somebody whom I can't meet again gave me this advise, actually he advised me a certain shop.
The problem is, that is has a manual in a language, that I can't read. And it looks pretty samll too.

So I think I will have to study all the data sheeds and figure it all out by myself.
Well, do I need this peripheral chip at all, when just experimenting in the beginning?
Can't I just use the I/O of the MC direcly???
Not all lines of the I/O are linked to the 82c55 !

Of course I want to start with the basics of 8051. Is the AT89S8252 a good chip to start with???