Hi Peter

ISBN 3-928051-69-5

Mikrocontroller Handbuch
Grundlagen, Hardware und Programmierung
Karl-Heinz Dietsche Martin Ohlsmann
Elektor- Verlag GmbH Aachen
1.Auflage 1993

I hope this will help you. I also sent the question to elektor. I asked on other articles before and usualy if you can't buy them anymore you get the permission to give away one copy. So I'm waiting for the answer.

The programm is on the "Kursdiskette" elektor number 1662
The programm for 80535 is exactly the same but has different number 1812
Price is € 13,50

Enough with elektor now what's going on with your board?

have fun

Peter