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Routines |
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Used by the routine at RunGame.
Looks for any special object in the room, which is an ordinary object of one of the types 70 to 78 or 80 to 87, and sets the flag at SpecialObjectFlag to show if there is one. It is called when a room has been built.
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Look through the ordinary objects.
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| CheckSpecialObjects | CB89 | CALL PointAtObjects | Call PointAtObjects to point IY at the first ordinary object, with the number of them in B and the size of each in DE. | |
| CB8C | LD C,$70 | Set the first of the types to look for, 70. | ||
| CheckSpecialObjects_Loop | CB8E | LD A,(IY+$00) | Fetch the type of the object. | |
| CB91 | CP $78 | Jump to CheckSpecialObjects_FoundSpecialObject if it is type 78. | ||
| CB93 | JR Z,CheckSpecialObjects_FoundSpecialObject | |||
| CB95 | AND %11111000 | Keep the type without its lowest three bits. | ||
| CB97 | CP C | Jump to CheckSpecialObjects_FoundSpecialObject if it is one of the types 70 to 77. | ||
| CB98 | JR Z,CheckSpecialObjects_FoundSpecialObject | |||
| CB9A | CP $80 | Jump to CheckSpecialObjects_FoundSpecialObject if it is one of the types 80 to 87. | ||
| CB9C | JR Z,CheckSpecialObjects_FoundSpecialObject | |||
| CB9E | ADD IY,DE | Move on to the next object. | ||
| CBA0 | DJNZ CheckSpecialObjects_Loop | Jump to CheckSpecialObjects_Loop until all of the objects have been checked. | ||
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Set the flag from whether a special object was found.
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| CBA2 | XOR A | Set the flag value to zero, as there is not a special object. | ||
| CheckSpecialObjects_SetSpecialObjectFlag | CBA3 | LD ($A742),A | Store the flag. | |
| CBA6 | RET | Return. | ||
| CheckSpecialObjects_FoundSpecialObject | CBA7 | LD A,$01 | Set the flag value to one. | |
| CBA9 | JR CheckSpecialObjects_SetSpecialObjectFlag | Jump to CheckSpecialObjects_SetSpecialObjectFlag to store it. | ||
| Prev: CB81 | Up: Map | Next: CBAB |