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Old 18 May 2016, 21:29   #9
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Join Date: Feb 2011
Location: Italy/Rome
Posts: 1,138
Originally Posted by Toni Wilen View Post
My crystal ball guess was correct. Real A1200 also shows identical image.

DDFSTOP is far too large for AGA higher fetch modes, causing bitplane DMA to steal nearly all cycles at the end of scanline. Vertical position wraps around to 0 before copper has had time to wake up -> copper keeps waiting..

You can use DMA debugger to check it ("v -1" in debugger to enable it). Then v <vpos> <hpos> to see line's activity.
So I cant' use pal screen? I have to use only ntsc? Is there any way to do that?
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