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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 | 6F54 | LD HL,$DAC8 | HL=Sprite02_3Wide_X_Position. | |||||
| 6F57 | LD BC,$7208 | 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 | 6F5A | LD A,(HL) | A=*HL. | |||||
| 6F5B | PUSH AF | Stash the original X position on the stack. | ||||||
| 6F5C | ADD A,$05 | A+=05 (offset to centre of car). | ||||||
| 6F5E | LD (HL),A | Write the adjusted position to *HL. | ||||||
| 6F5F | PUSH HL | Copy HL to IX. | ||||||
| 6F60 | POP IX | |||||||
| 6F62 | LD IY,$DAE0 | IY=Egg_X_Position (egg sprite data). | ||||||
| 6F66 | PUSH BC | Stash BC on the stack. | ||||||
| 6F67 | CALL CheckEggCollision | Call CheckEggCollision. | ||||||
| 6F6A | POP BC | Restore BC from the stack. | ||||||
| 6F6B | 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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| 6F6D | POP AF | Restore the original X position from the stack. | ||||||
| 6F6E | LD (HL),A | Write it back to *HL. | ||||||
| 6F6F | CALL GenerateRandomNumber | Call GenerateRandomNumber. | ||||||
| 6F72 | OR %00010000 | Set bit 4 (ensure a minimum crash duration). | ||||||
| 6F74 | LD (BC),A | Write A to *BC (crash timer). | ||||||
| 6F75 | LD A,$0F | Call AddToScore to add 0F points to the score. | ||||||
| 6F77 | 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 | 6F7A | LD B,$00 | B=00 (loop 0100 times). | |||||
| PlayHitSound_Loop | 6F7C | CALL GenerateRandomNumber | Call GenerateRandomNumber. | |||||
| 6F7F | AND %00011000 | Keep only bits 3-4. | ||||||
| 6F81 | OR %00000001 | Set bit 0 (border colour: blue). | ||||||
| 6F83 | OUT ($FE),A | Send to the speaker. | ||||||
| 6F85 | NOP | No operation. | ||||||
| 6F86 | NOP | |||||||
| 6F87 | DJNZ PlayHitSound_Loop | Decrease B by one and loop back to PlayHitSound_Loop until done. | ||||||
| 6F89 | RET | Return. | ||||||
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No collision — restore the original X position and return.
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| CheckCarEggCollision_Miss | 6F8A | POP AF | Restore the original X position from the stack. | |||||
| 6F8B | LD (HL),A | Write it back to *HL. | ||||||
| 6F8C | RET | Return. | ||||||
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