Routines
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D629: The sound of a bolt being fired
Used by the routine at FIRE.
32 single waves; each half-wave count is the step count less the one before. FIRE comes here straight from an LDIR that leaves B zero, so the counts alternate between a short one falling from 32 and a long one falling from 255: a high note and a low one, interleaved.
Input
B the count to start from
FIRE_SOUND D629 LD C,$20 for C = 32 down to 1: one wave at C less the last count
FIRE_SOUND_0 D62B LD A,C
D62C SUB B
D62D LD B,A
D62E CALL CLICK
D631 DEC C
D632 JR NZ,FIRE_SOUND_0
D634 RET
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