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Old 18 May 2016, 21:27   #8
Toni Wilen
WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 42
Posts: 19,561
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.
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