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B471: Initialize the theme tune data
Used by the routine at 80E5.
B471 DI Disable interrupts
B472 LD HL,$B560 Point HL at the start of the theme tune. (B560)
B475 LD ($B4E7),HL Set this as the next address to look at. (B4E7)
B478 LD A,$FF Set to no key pressed.
B47A LD ($B4E9),A
B47D INC A Set tune to index 0 and return.
B47E LD ($B55F),A
B481 RET
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