|
Routines |
| Prev: 42533 | Up: Map | Next: 42582 |
|
Used by the routine at MoveRobotHorizontally.
Fires a spark, which is the first weapon of the robot. It costs eight units of energy and needs the battery to have at least 16 units.
|
||||||||||
| FireWeaponA | 42534 | RES 4,A | Clear the flag that says that the first weapon has been fired... | |||||||
| 42536 | LD (38437),A | ...and store the controls. | ||||||||
| 42539 | LD HL,38560 | Point HL at the first of the three entities that are used for shots. | ||||||||
| 42542 | LD DE,16 | Each entity is 16 bytes long. | ||||||||
| 42545 | LD B,3 | There are three entities to check. | ||||||||
| FireWeaponA_Check | 42547 | LD A,(HL) | Fetch the type of the entity. | |||||||
| 42548 | SUB 88 | Return if it is one of the sprites 88 to 91 (the shots never use these types, so this never stops the weapon). | ||||||||
| 42550 | CP 4 | |||||||||
| 42552 | RET C | |||||||||
| 42553 | ADD HL,DE | Move on to the next entity. | ||||||||
| 42554 | DJNZ FireWeaponA_Check | Loop back until all three have been checked. | ||||||||
| 42556 | LD BC,2048 | Set the cost of the shot to 2048... | ||||||||
| 42559 | LD (38463),BC | ...and store it. | ||||||||
| 42563 | LD HL,38560 | Point HL at the first of the entities for shots again. | ||||||||
| 42566 | LD BC,828 | Use three entities, and use type 60 for the sprite. | ||||||||
| 42569 | LD A,3 | Use the lowest two bits of the type of the robot... | ||||||||
| 42571 | LD (42634),A | ...to choose the sprite of the shot (this changes the mask used by the instruction at 42633). | ||||||||
| 42574 | LD A,(38459) | Fetch the level of the battery. | ||||||||
| 42577 | CP 16 | Return if it is below 16. | ||||||||
| 42579 | RET C | |||||||||
| 42580 | JR FireWeapon_Find | Jump to fire the shot. | ||||||||
| Prev: 42533 | Up: Map | Next: 42582 |