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Old 10 May 2017, 08:27   #29
Toni Wilen
WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 43
Posts: 21,784
Originally Posted by pandy71 View Post
Oh... HRM says that BPLxDAT is usually loaded by DMA but it can be loaded by CPU and/or Copper...
Yes but unfortunately Denise forces all inactive planes to output zeros so any BPLxDAT write to inactive plane does nothing. (Except in "7 plane" mode where Agnus thinks mode is 4-plane but Denise thinks it is 6-plane). Having separate bitplane enable mask for Agnus and Denise would have been quite nice.

Writing to BPL1DAT is (the only?) really useful feature, it horizontally enables sprites immediately, even if DDFSTRT has not been passed yet.
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