stty changing fb-frequency?

Hallo!

I  played  a  bit with stty cols and when I reduce them to "stty cols 160" the
monitor says "Signal out of range" Why's that? Is stty not just  reducing  the
columns?  I  hoped I could just set the number of cols and rows one would have
with 1280x1024 to make the chars nice and clear by scaleing that part  to  the
whole screen.

Thanks
Lynx


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