Routines
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49741: Sounds: Square Wave
Used by the routines at Sounds_PlaySquareWave_Loop and 49763.
Input
E Duration
Sounds_SquareWave 49741 LD B,E B=E.
49742 EI Enable interrupts.
Flip speaker on (set bit 4).
49743 LD A,%00010000 A=16 (speaker on = bit 4).
49745 OUT (254),A
Sounds_SquareWave_Loop 49747 DJNZ Sounds_SquareWave_Loop Decrease counter by one and loop back to Sounds_SquareWave_Loop until counter is zero.
49749 LD B,E B=E.
Flip speaker off (unset bit 4).
49750 XOR A Speaker off.
49751 OUT (254),A
SquareWave_Silence_Loop 49753 DJNZ SquareWave_Silence_Loop Decrease counter by one and loop back to SquareWave_Silence_Loop until counter is zero.
49755 RET Return.
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