Routines
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B4F2: First half of the wave
speaker_on_wait
B4F2
DJNZ
speaker_on_wait
wait, then speaker off
B4F4
LD B,A
B4F5
XOR A
B4F6
OUT ($FE),A
B4F8
LD A,B
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B4ED
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Map
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B4F9