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Old 14 August 2018, 16:12   #46
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Join Date: Jun 2015
Location: Germany
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Originally Posted by chb View Post
In fillmode, the blitter needs to read a word for every word written, plus there is an idle cycle (which can be used by the cpu), so 6 clock cycles and 2 memory cycles per word. A movem is 4 cycles per word, and one memory cycle. A movem is 32 bit per register, so 10 registers are sufficient to fill a 320 pix wide span in one bitplane.
A 32bit move to chipmem will take two mem cycles for OCS and A600 which only have a 16bit chipmem bus.
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