Routines
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9CA4: Play a sound
Used by the routines at 9858, 9D08, 9E98 and A59D.
Input
H Frequency
L Length
9CA4 LD A,$10
9CA6 OUT ($FE),A
9CA8 LD B,H
9CA9 DJNZ $9CA9
9CAB XOR A
9CAC OUT ($FE),A
9CAE LD B,H
9CAF DJNZ $9CAF
9CB1 DEC L
9CB2 JR NZ,$9CA4
9CB4 RET
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