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Routines |
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Used by the routine at InitialiseGame.
Called every frame. Plays the next note of the sound effect which is in progress, if there is one. The effects are started by setting SoundNotesLeft to the number of notes and SoundNoteAddress to the address one byte before the notes. The notes are played from the last to the first, and each is the length of a pulse, so a bigger number is a lower note.
The sound effects played by this routine are:
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Return if there are no notes left.
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| PlaySoundEffect | AEA9 | LD HL,$A23C | Point HL at the number of notes left. | |||||||||
| AEAC | LD A,(HL) | Fetch the number of notes left. | ||||||||||
| AEAD | AND A | Test whether the effect is over. | ||||||||||
| AEAE | RET Z | Return if it is. | ||||||||||
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Play the next note from the end of the list.
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| AEAF | DEC (HL) | Count down the notes. | ||||||||||
| AEB0 | INC HL | Move on to the address of the notes. | ||||||||||
| AEB1 | LD E,(HL) | Fetch the low byte of the address. | ||||||||||
| AEB2 | INC HL | Move on to the high byte. | ||||||||||
| AEB3 | LD D,(HL) | Fetch the high byte of the address. | ||||||||||
| AEB4 | EX DE,HL | Swap the address into HL. | ||||||||||
| AEB5 | CALL AddAToHL | Point HL at the note. | ||||||||||
| AEB8 | LD A,(HL) | Fetch the note. | ||||||||||
| AEB9 | LD B,A | Use it as the length of a pulse. | ||||||||||
| AEBA | LD C,$0C | Set the number of pulses. | ||||||||||
| AEBC | JP PlayWaveSequence | Play the note. | ||||||||||
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