[pstricks] problems drawing block diagram

[Patrick Pucholt]

Hello,

drawing the attached block diagram I faced some problems

1. There should be dots marking wire connections. How can I calculate 
such a dot position?
2. I used \rnode to define all my blocks as nodes. Somehow the anchor 
point for the node connections seems to be the lower left corner of each 
block so that I have to use alle the ugly offsets

Would be great, if somebody could help me with this ... especially with 
the connection dots.

Pat
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