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Old 10 January 2020, 15:42   #19
Toni Wilen
WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 45
Posts: 23,669
Lets not speculate impossible things. At least without any evidence. Agnus DMA has nothing to do with this, nothing changes. It happens because Paula does not send "reset DMA pointer" signal to Agnus.

It can only happen if period counter counts to zero at least twice/scan line (with exactly right timing condition).

It can only happen repeatedly if AUDxLEN is integer divisible by scanline length (test program 2270/2) = AUDxLEN expires always at same horizontal position.

(I still don't know 100% correct rules, some piece is still missing)
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