Hi Jan,
Thanks for your reply
Robert

Are you aware of the Elektor modifications?
No, but I have downloaded the files and will study them.

And are you aware of my adaptation of B52 to the 'RD2s?
No, pray tell

I don't have any particular test suite, but you can find a few random B52 programs I was playing with, here. Enjoy!
Thanks

My motivation was I wanted to have a 'higher' language in my system for fast developments.
I choose 8052AH because it was already there and well documented.
But most of all: I like to develop my own software