Routines
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C616: Mostly along x, or mostly along y?
Used by the routine at ghost_abs_dy.
ghost_pick_view C616 CP C |dy| >= |dx|: mostly along y
C617 JR NC,ghost_mostly_y
C619 LD A,(IX+$09) which way along x
C61C AND A
C61D JP M,ghost_x_negative
C620 RES 1,(IX+$00) +x: view 0
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