Routines
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B82F: Fire: turn round if blocked
Used by the routine at fire_ew_move.
Input
A the direction bit in +13
F Z clear if the move was blocked
fire_turn_if_blocked B82F JR Z,fire_flicker_and_draw not blocked
B831 XOR (IX+$0D) turn round, with a thud
B834 LD (IX+$0D),A
B837 CALL sound_thud
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