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Originally Posted by frank_b
The blitter should be about the same speed as the cpu for a clear. It should be around 4 cycles per word.
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OK, thanks.
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Originally Posted by frank_b
Some machines don't have a blitter so it's good to know these things
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True.
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Originally Posted by frank_b
Besides you might need to quickly copy or clear a fast RAM buffer some time
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and true again.
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Originally Posted by StingRay
Pretty common method to clear the screen on 68000 is this:
Clear the upper half using the blitter, clear the bottom half using the CPU [movem.l dx-ax,-(a7)]
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OK, good to know. One thing though, I take it that you have to save / restore the stack (what I mean is: where a7 points to) before / after the movem clear operation so as not to kill the stack --> crash...?