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Routines |
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The handler for sound effect actors with the ID 16. Each time it is called it plays the next note from a table of periods. The table address is held in the actor (IX+02 and IX+03), and the notes are played from the end of the table towards the start. The number of cycles in each note is held in IX+04. The actor is removed after the first entry of the table.
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| Handler_Notes | 689A | DEC (IX+$01) | Decrease the note counter by one. | |||||
| 689D | JR Z,RemoveActor | Jump to RemoveActor if there are no more notes to play. | ||||||
| 689F | LD C,(IX+$01) | Fetch the note counter. | ||||||
| 68A2 | LD B,$00 | Set the high byte of the offset to 00. | ||||||
| 68A4 | LD L,(IX+$02) | Fetch the low byte of the address of the table of periods. | ||||||
| 68A7 | LD H,(IX+$03) | Fetch the high byte of the address of the table of periods. | ||||||
| 68AA | ADD HL,BC | Find the note in the table using the note counter. | ||||||
| 68AB | LD D,(HL) | Fetch the period of the note. | ||||||
| 68AC | LD C,(IX+$04) | Fetch the number of cycles in each note. | ||||||
| 68AF | JR Handler_PlayCycles | Jump to Handler_PlayCycles. | ||||||
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