Hello Fourdee,
thanks for the help, the problem was
the most recent DietPi image
as the downloads (zip) is not clearly named they’re named DietPi_RPi-arm6-(Jessie), I didn’t use the most recent, I used the old v109 (even that I thought I’d write the new one). After writing the actual image everything works as supposed.
— Banging my head on the table —
Thanks again, Walter