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Routines |
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Used by the routine at Handle_Carrying_Eagle.
Makes the eagle let go of Sabreman, if it is in the open part of the room (the x position is from 18 to CF and the y position is from 48 to 9F). If it is not, the routine returns and the eagle goes on carrying him.
When the eagle lets go, the routine does not return to its caller but carries on at Release_Sabreman, which ends the handler. The position of Sabreman is set to the position of the eagle, 10 further down but no lower than 9F if the room has a floor. The contact flags of Sabreman and the target of the eagle are cleared.
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| Check_Eagle_Release | E51B | DI | Disable interrupts. | |||||||
| E51C | LD A,(IX+$01) | Fetch the x position of the eagle. | ||||||||
| E51F | CP $18 | Return if it is less than 18. | ||||||||
| E521 | RET C | |||||||||
| E522 | CP $D0 | Return if it is D0 or more. | ||||||||
| E524 | RET NC | |||||||||
| E525 | LD A,(IX+$03) | Fetch the y position of the eagle. | ||||||||
| E528 | CP $48 | Return if it is less than 48. | ||||||||
| E52A | RET C | |||||||||
| E52B | CP $A0 | Return if it is A0 or more. | ||||||||
| E52D | RET NC | |||||||||
| E52E | POP HL | Discard the return address. | ||||||||
| E52F | LD A,(IX+$0B) | Fetch the contact flags. | ||||||||
| E532 | OR E | Combine them with the flags of the room. | ||||||||
| E533 | LD E,A | Store the result in E. | ||||||||
| E534 | LD A,(IX+$03) | Fetch the y position of the eagle. | ||||||||
| E537 | ADD A,$10 | Add 10. | ||||||||
| E539 | BIT 4,E | Jump to Check_Eagle_Release_Set_Position if the room has no floor. | ||||||||
| E53B | JR Z,Check_Eagle_Release_Set_Position | |||||||||
| E53D | CP $9F | Jump to Check_Eagle_Release_Set_Position if the result is less than 9F. | ||||||||
| E53F | JR C,Check_Eagle_Release_Set_Position | |||||||||
| E541 | LD A,$9F | Limit the y position to 9F. | ||||||||
| Check_Eagle_Release_Set_Position | E543 | LD ($8F23),A | Set the y position of Sabreman. | |||||||
| E546 | LD A,(IX+$01) | Fetch the x position of the eagle. | ||||||||
| E549 | LD ($8F22),A | Set the x position of Sabreman. | ||||||||
| E54C | XOR A | Clear the contact flags of Sabreman. | ||||||||
| E54D | LD ($8F25),A | |||||||||
| E550 | LD (IX+$0C),A | Clear the x position of the target. | ||||||||
| E553 | LD (IX+$0E),A | Clear the y position of the target. | ||||||||
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