AVR-Transistortester display shows squares

OP #3512999
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I'm new in this so not sure if i posted in correct forum ...
I've built the TT and loaded hex and eep file, set fuses to C1/D9 for 
Atmega8. Should all be fine but i see only "Kloetzchen" square boxes in 
display.
Display should be fine as i use it with a similar purchased TT.
I saw a log that talks about wrongly conneced display but as far as i 
see that should not be problem - also contrast should be ok.
Log says there could be other causes to this problem?!
Another question: i see software uart defined on pin 26 i.e. PC3. But 
Terminal shows no data being written to it.
Help with this much appreciated. I also speak german in case that makes 
communication easier. Tx
OP #3513979
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Vielen Dank fuer die prompte Antwort!
Habe nach so etwas gesucht aber finde nichts dass Thread heisst oder 
eine Kategorie "Transistortester AVR". Koenntest Du mir bitte sagen wie 
ich dahin navigieren kann?
Ist ein Thread dasselbe wie ein Beitrag? Ich sehe aber keine 
Unterkategorie die "Transistortester AVR" heisst. Irgend etwas formales?
Und es gibt Tausende von Benutzern ... wie finde ich denn Karl Heinz 
spezifisch?

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