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=>     R0 =     43, &2B (Read pixel mask)
     R1 =     Sprite area
     R2 =     Sprite name/pointer
     R3 =     x coordinate (in pixels)
     R4 =     y coordinate (in pixels)

<=     R5 =     0 => Transparant
           1 => Solid

This SWI reads the mask at a point.

See PRM 1, page 794

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