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Just my guess: KK is saving one of three passes in the blitter c2p (the first one probably, as it replaces the bytes in a word) by writing the data in scrambled order; if you do it in a clever way, it does not take additional CPU time.
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Exactly that. Long live the a7 register.
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As he called it a 'crazy programming trick' at some point, my bet would be on some additional use of the stack's word alignment, but I might be off completely. :-)
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You're completely on point. All my rendering writes through (a7)+, prescrambling columns at the byte level. Of course the other byte is another column, 8px to the right.