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64D6: Play High Tone
Used by the routine at GamePlayEntry.
Plays 50 square waves with a duration of 20.
PlayHighTone 64D6 LD D,$20 Set the duration of the wave in D to 20.
64D8 LD C,$50 Set the wave counter in C to 50.
64DA JR PlayTone_Loop Jump to PlayTone_Loop.
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