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Old 19 June 2021, 09:26   #1
jotd
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blitter speed and fmode

if you have a game that blits using OCS FMODE = 0 and you have AGA is that possible to blit faster by changing FMODE? or is it unrelated?
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Old 19 June 2021, 10:22   #2
mcgeezer
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Originally Posted by jotd View Post
if you have a game that blits using OCS FMODE = 0 and you have AGA is that possible to blit faster by changing FMODE? or is it unrelated?
It depends on what the game is doing. If it's a static screen game then you should be able to change to fetch x 4 and modify the display modulo and DDF start and stop values.

That would the blitter more slots and therefore would be faster.
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Old 19 June 2021, 14:38   #3
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It's unrelated. Blitter is 16-bit, and you need proper alignment/size for double CAS and/or 32-bit which is something you can guarantee with sprites and bitplanes but not with the blitter.
It's only faster indirectly, by having more dma slots available for blitting.
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