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F703: Plays a note.
Used by the routine at Music_Start.
Input
DE Duration
BC Pitch
Output
Music_PlayNote F703 LD A,$17 Turn on speaker and wait to create pitch.
F705 OUT ($FE),A
F707 CALL Pause
F70A LD A,$07 Turn off speakr and wait.
F70C OUT ($FE),A
F70E CALL Pause
F711 DEC DE Repeat for given duration.
F712 LD A,D
F713 OR E
F714 JR NZ,Music_PlayNote
F716 RET
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