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Update apple2_hires.md

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tools/bitmap editor/apple2_hires.md
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@ -377,3 +377,5 @@ Is the Apple ]\[ hires screen 280 pixels wide ? Yes, if you consider a monochrom
Let's speak of two others ... yes, the nightmare is far from finished !
### Hires rules part 5: last but not least
Even and odd bytes have their color bits swapped. Preshifting bitmaps
Consecutive bytes with hi-bit set/unset will cause color problems.