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Routines |
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Used by the routine at Handler_Car_Type1.
Checks if Percy's egg has hit the car. If so, starts the crash animation and awards points.
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| CheckCarEggCollision | 28500 | LD HL,56008 | HL=Sprite02_3Wide_X_Position. | |||||
| 28503 | LD BC,29192 | BC=CarCrashTimer (crash timer). | ||||||
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This entry point is used by the routine at Handler_Cars.
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| CheckCarEggCollision_Test | 28506 | LD A,(HL) | A=*HL. | |||||
| 28507 | PUSH AF | Stash the original X position on the stack. | ||||||
| 28508 | ADD A,5 | A+=5 (offset to centre of car). | ||||||
| 28510 | LD (HL),A | Write the adjusted position to *HL. | ||||||
| 28511 | PUSH HL | Copy HL to IX. | ||||||
| 28512 | POP IX | |||||||
| 28514 | LD IY,56032 | IY=Egg_X_Position (egg sprite data). | ||||||
| 28518 | PUSH BC | Stash BC on the stack. | ||||||
| 28519 | CALL CheckEggCollision | Call CheckEggCollision. | ||||||
| 28522 | POP BC | Restore BC from the stack. | ||||||
| 28523 | JR C,CheckCarEggCollision_Miss | Jump to CheckCarEggCollision_Miss if no collision. | ||||||
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Egg hit the car — restore the original X position and start the crash.
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| 28525 | POP AF | Restore the original X position from the stack. | ||||||
| 28526 | LD (HL),A | Write it back to *HL. | ||||||
| 28527 | CALL GenerateRandomNumber | Call GenerateRandomNumber. | ||||||
| 28530 | OR %00010000 | Set bit 4 (ensure a minimum crash duration). | ||||||
| 28532 | LD (BC),A | Write A to *BC (crash timer). | ||||||
| 28533 | LD A,15 | Call AddToScore to add 15 points to the score. | ||||||
| 28535 | CALL AddToScore | |||||||
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This entry point is used by the routines at Handler_RedBird, HandlerFrog01_CheckEggCollision, Animate_Stunned_Hazard, Check_Hazard_Collision, Handle_Plane_Bomb and Handler_Balloon.
Play a short random sound burst — used as a hit sound effect by multiple routines.
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| PlayHitSound | 28538 | LD B,0 | B=0 (loop 256 times). | |||||
| PlayHitSound_Loop | 28540 | CALL GenerateRandomNumber | Call GenerateRandomNumber. | |||||
| 28543 | AND %00011000 | Keep only bits 3-4. | ||||||
| 28545 | OR %00000001 | Set bit 0 (border colour: blue). | ||||||
| 28547 | OUT (254),A | Send to the speaker. | ||||||
| 28549 | NOP | No operation. | ||||||
| 28550 | NOP | |||||||
| 28551 | DJNZ PlayHitSound_Loop | Decrease B by one and loop back to PlayHitSound_Loop until done. | ||||||
| 28553 | RET | Return. | ||||||
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No collision — restore the original X position and return.
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| CheckCarEggCollision_Miss | 28554 | POP AF | Restore the original X position from the stack. | |||||
| 28555 | LD (HL),A | Write it back to *HL. | ||||||
| 28556 | RET | Return. | ||||||
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