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03 July 2012, 06:04
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#1 |
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Registered User
Join Date: Jan 2012
Location: USA
Posts: 372
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One "hole" in each scan line to turn off blitter nasty?
Came across something today that I hadn't heard before.
Apparently there is one DMA slot per scan line that can't be used by the blitter under any circumstances. It was suggested that this was done to allow the CPU to turn off blitter-nasty if necessary. Anyone know anything about this? |
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03 July 2012, 12:12
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#2 |
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WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 49
Posts: 26,534
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Not true. Can't be true
 It would break lots of demos that do not wait for the blitter and use blit that does not have any free DMA slots. (Usually D=A copy) Perhaps it meant Copper? Copper can't use last slot (AFAIK only if PAL mode). |
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