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Routines |
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Used by the routine at HandleLevelIntroduction.
Plays eight cycles of a square wave. The period of the wave is taken from the table at LevelTonePeriods, using byte 06 of the actor as the index, which is then increased by one ready for the next call. This is used by the actor for the level introduction parade (see IntroductionCharlie). The audio is three calls, which are eight frames apart.
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| LevelStartJingle | 6854 | LD C,(IX+$06) | Fetch the index (byte 06 of the actor). | |||||
| 6857 | INC (IX+$06) | Increase the index by one, ready for the next call. | ||||||
| 685A | LD B,$00 | Find the period in the table at LevelTonePeriods using the index. | ||||||
| 685C | LD HL,$686A | |||||||
| 685F | ADD HL,BC | |||||||
| 6860 | LD D,(HL) | Fetch the period of the wave. | ||||||
| 6861 | LD C,$08 | Set the cycle counter to 08. | ||||||
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This entry point is used by the routine at GameStartJingle.
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| LevelStartJingle_Loop | 6863 | CALL PlaySquareWave | Play a cycle using PlaySquareWave. | |||||
| 6866 | DEC C | Decrease the cycle counter by one. | ||||||
| 6867 | JR NZ,LevelStartJingle_Loop | Loop back to LevelStartJingle_Loop until the cycle counter is zero. | ||||||
| 6869 | RET | Return. | ||||||
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