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C21D: Routine at C21D
C21D LD E,(IX+$01) E=*IX+01.
C220 LD D,$01 D=01.
C222 CALL Sounds_PlaySquareWave_Loop Call Sounds_PlaySquareWave_Loop.
Add 0B to *IX+01.
C225 LD A,(IX+$01) A=*IX+01.
C228 ADD A,$0B A+=0B.
C22A LD (IX+$01),A Write A to *IX+01.
C22D CP $C1 Return if A is lower than C1.
C22F RET C
C230 LD (IX+$00),$00 Write 00 to *IX+00.
C234 RET Return.
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