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B8FF: Routine at B8FF
Used by the routine at A73C.
B8FF LD D,$07
B901 LD A,D
B902 DAA
B903 XOR $F0
B905 RLCA
B906 LD C,A
B907 LD A,($5E42)
B90A RRCA
B90B RRCA
B90C RRCA
B90D AND $60
B90F XOR C
B910 LD C,A
B911 CALL PlaySquareWave
B914 DEC D
B915 JR NZ,$B901
B917 RET
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