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B8DA: Play square wave sound
Input
C Duration of wave
PlaySquareWave B8DA LD B,C Decrease duration by one and loop back to Silence_Loop until duration is zero.
Silence_Loop B8DB DJNZ Silence_Loop
B8DD LD A,$10 A=10 (speaker on = bit 4).
B8DF OUT ($FE),A
B8E1 LD B,C Decrease duration by one and loop back to PlaySquareWave_Loop until duration is zero.
PlaySquareWave_Loop B8E2 DJNZ PlaySquareWave_Loop
B8E4 XOR A Speaker off.
B8E5 OUT ($FE),A
B8E7 RET Return.
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