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Old 13 April 2015, 17:39   #745
Toni Wilen
WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 42
Posts: 20,496
Sushi Boyz by Ghostown: OCS Agnus scroller bug is A500 confirmed. It is switching bitplane DMA on inside DDFSTRT/DDFSTOP window. This works slightly differently on OCS vs ECS/AGA.

It looks like bug in copper list, waits for earlier position $ec/$00 but it is already $ec/$a0.

00060890: ec01 fffe [0ec 09c]  ;  Wait for vpos >= 0xec and hpos >= 0x00
                               ;  VP ec, VE 7f; HP 00, HE fe; BFD 1
00060894: 0096 8100 [0ec 0a0]  ;  DMACON := 0x8100
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