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Routines |
| Prev: A891 | Up: Map | Next: A8E4 |
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The handler for entity types 20 to 2F, which are the sprites that the robot has while it is turning. The turn is finished at once; the entity gets one of the types for walking (10 to 1F) and the robot is checked for a collision with an enemy. If the robot has hit an enemy it loses some energy, and it is destroyed if it has none left. This routine then handles the entity again as its new type, without drawing it.
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| FinishRobotTurn | A8A4 | LD A,($9625) | Fetch the controls... | |||||
| A8A7 | AND $FC | ...clear the left and right bits... | ||||||
| A8A9 | LD ($9625),A | ...and store them. | ||||||
| A8AC | LD B,(IX+$06) | Fetch the speed of the robot into B. | ||||||
| A8AF | LD C,$00 | Clear the low byte of the step count. | ||||||
| A8B1 | LD A,(IX+$00) | Fetch the type of the robot... | ||||||
| A8B4 | AND $8F | ...change it into the matching type for walking... | ||||||
| A8B6 | OR $10 | |||||||
| A8B8 | LD (IX+$00),A | ...and store it. | ||||||
| A8BB | LD A,(IX+$00) | Fetch the new type... | ||||||
| A8BE | EX AF,AF' | ...and keep it in A'. | ||||||
| A8BF | CALL CheckShotHit | Check whether the robot has hit an enemy using CheckShotHit. | ||||||
| A8C2 | LD A,(IX+$00) | Fetch the type of the robot again. | ||||||
| A8C5 | CP $38 | Jump if it has not been turned into smoke. | ||||||
| A8C7 | JR NZ,FinishRobotTurn_Discard | |||||||
| A8C9 | LD A,($965A) | Fetch the number of sectors that have been dealt with. | ||||||
| A8CC | ADD A,$1A | Add 1A to get the energy that the collision costs... | ||||||
| A8CE | LD B,A | ...and keep it in B. | ||||||
| A8CF | LD A,($963B) | Fetch the energy of the battery. | ||||||
| A8D2 | SUB B | Take off the cost. | ||||||
| A8D3 | JR C,FinishRobotTurn_NoEnergy | Jump if there is not enough energy. | ||||||
| A8D5 | EX AF,AF' | Otherwise get the type that the robot had... | ||||||
| A8D6 | LD (IX+$00),A | ...and restore it, so that it is not destroyed... | ||||||
| A8D9 | EX AF,AF' | Switch back to the energy. | ||||||
| A8DA | JR FinishRobotTurn_Store | ...and jump to store the energy. | ||||||
| FinishRobotTurn_NoEnergy | A8DC | XOR A | The battery is empty. | |||||
| FinishRobotTurn_Store | A8DD | LD ($963B),A | Store the energy of the battery. | |||||
| FinishRobotTurn_Discard | A8E0 | POP HL | Discard the return address... | |||||
| A8E1 | JP MainLoop_Dispatch | ...and handle the entity again as its new type using MainLoop_Dispatch. | ||||||
| Prev: A891 | Up: Map | Next: A8E4 |