> While scrolling (slowly) up or down, lines/graphics change colour 
> and shortly are shown twice, which is very boring.

I can't remember what the effect is called.. it's shearing, isn't
it?
 
> I am using a 6 planes AGA public sreen.

Which is the *exact* cause of your problems.

> (A 1200 with blizzard 1230/IV 50 MHz no Fpu)
> 
> Can anyone give me a hint, how to change this behaviour?

Buy a graphics card? I don't have one, but I can live with
the graphical effect simply because I know it's just an
artefact of a slow, plodding planar chipset.

(if you want to know why it's doing it, think of those
little movie-cards you get in cereal boxes, and when you
tilt them to the light and can see BOTH images - it's 
just where the blitter has only done half the work before
it has to display it)


-- 
Matt Sealey [EMAIL PROTECTED] 
Distributed Systems Support
Computer Centre
University of Leicester

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