Routines
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C915: Rotational control: set the pause and choose the direction
Used by the routine at rotational_turn.
Sets the pause between turns (two frames' wait) and leaves NZ for a right turn, Z for a left one, for left_right_calc_sprite.
start_turn_delay C915 LD A,(IX+$0D) bit 1 of the pause count
C918 OR $02
C91A LD (IX+$0D),A
C91D BIT 1,C NZ: right
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