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Old 22 September 2015, 15:30   #2
Toni Wilen
WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 44
Posts: 23,589
I guess you triggered Agnus undocumented feature: write to DMA pointer register gets ignored if following cycle does DMA access using same DMA pointer register.

Same happens with other DMA channels too, for example sprites, and there are demos that, as usual, accidentally depend on it..
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