The online data sheet was for a 1806 which doesn't appear to be sold on
epay. That being said, it looks like the pinout for the 1801 is simple
enough.
http://www.tiffe.de/Robotron/Bausteinuebersicht/K180x/1801vm1.jpg
The web directory has DejaVu schematics and the like, have a look:
http://www.tiffe.de/Robotron/Bausteinuebersicht/K180x/