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Routines |
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Used by the routines at CompletePlanet, ApplyCollisionEffects, DamageShip, AddFuel, AddShip, CheckShotCollisions, UpdateType19 and UpdateCrystalStack.
Plays a falling note of 10 beeps. It is used when an object is hit, destroyed or damaged.
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| PlayHitSound | 724C | LD C,$10 | The falling note has 10 beeps. | |
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This entry point is used by the routine at PlayExplosionHitSound.
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| PlayHitSound_Loop | 724E | LD A,C | The pitch starts at the number of beeps left. | |
| 724F | ADD A,A | Double it. | ||
| 7250 | ADD A,A | Double it again, so the note falls quickly. | ||
| 7251 | CPL | Invert it so the note falls as the count does. | ||
| 7252 | AND %01111111 | Keep the bits of A that are set in 7F. | ||
| 7254 | LD B,A | That is the half-period of this beep. | ||
| 7255 | CALL PlaySquareWave | Call PlaySquareWave. | ||
| 7258 | DEC C | One beep of the falling note has been played. | ||
| 7259 | JR NZ,PlayHitSound_Loop | Jump to PlayHitSound_Loop if the zero flag is clear. | ||
| 725B | RET | Return. | ||
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