Routines
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54914: Play Square Wave
Used by the routines at PlayJumpSound, PlayProjectileSound and PlayWaveSequence.
Plays a single beep by switching the speaker on, waiting, switching it off and waiting again. The bigger the pitch, the longer the beep.
Input
B Pitch
Hold the speaker on, then off.
PlaySquareWave 54914 LD A,16 Turn the speaker on.
54916 OUT (254),A
54918 LD A,B Keep the pitch in A.
PlaySquareWave_On 54919 DJNZ PlaySquareWave_On Wait for the first half of the beep.
54921 LD B,A Restore the pitch.
54922 XOR A Turn the speaker off.
54923 OUT (254),A
54925 LD A,B Keep the pitch in A.
PlaySquareWave_Off 54926 DJNZ PlaySquareWave_Off Wait for the second half of the beep.
54928 LD B,A Restore the pitch.
54929 RET Return.
View the equivalent code in;
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