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Routines |
| Prev: A625 | Up: Map | Next: A656 |
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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 10 units.
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| FireWeaponA | A626 | RES 4,A | Clear the flag that says that the first weapon has been fired... | |||||||
| A628 | LD ($9625),A | ...and store the controls. | ||||||||
| A62B | LD HL,$96A0 | Point HL at the first of the three entities that are used for shots. | ||||||||
| A62E | LD DE,$0010 | Each entity is 10 bytes long. | ||||||||
| A631 | LD B,$03 | There are three entities to check. | ||||||||
| FireWeaponA_Check | A633 | LD A,(HL) | Fetch the type of the entity. | |||||||
| A634 | SUB $58 | Return if it is one of the sprites 58 to 5B (the shots never use these types, so this never stops the weapon). | ||||||||
| A636 | CP $04 | |||||||||
| A638 | RET C | |||||||||
| A639 | ADD HL,DE | Move on to the next entity. | ||||||||
| A63A | DJNZ FireWeaponA_Check | Loop back until all three have been checked. | ||||||||
| A63C | LD BC,$0800 | Set the cost of the shot to 0800... | ||||||||
| A63F | LD ($963F),BC | ...and store it. | ||||||||
| A643 | LD HL,$96A0 | Point HL at the first of the entities for shots again. | ||||||||
| A646 | LD BC,$033C | Use three entities, and use type 3C for the sprite. | ||||||||
| A649 | LD A,$03 | Use the lowest two bits of the type of the robot... | ||||||||
| A64B | LD ($A68A),A | ...to choose the sprite of the shot (this changes the mask used by the instruction at A689). | ||||||||
| A64E | LD A,($963B) | Fetch the level of the battery. | ||||||||
| A651 | CP $10 | Return if it is below 10. | ||||||||
| A653 | RET C | |||||||||
| A654 | JR FireWeapon_Find | Jump to fire the shot. | ||||||||
| Prev: A625 | Up: Map | Next: A656 |