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Routines |
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Used by the routine at ScriptRoutine_OpenTrapDoor.
Open the trap door: queue a sound, switch the lever graphic layout to open facing right, and update the related scenery entity types.
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| Open_TrapDoor | EDF8 | PUSH IX | Stash IX, HL and DE on the stack. | |
| EDFA | PUSH HL | |||
| EDFB | PUSH DE | |||
| EDFC | CALL Check_EntitiesNearTrapDoor | Call Check_EntitiesNearTrapDoor to check whether entities require the trap door to open. | ||
| EDFF | JP NC,TrapDoor_RestoreAndReturn | Jump to TrapDoor_RestoreAndReturn to continue if no open is required. | ||
| EE02 | LD HL,$72B3 | Point HL at the game event flags (GameEventFlags). | ||
| EE05 | BIT 4,(HL) | Is "task-two / upstairs event latch" (bit 04 of GameEventFlags) set? If so, jump to TrapDoor_RestoreAndReturn. | ||
| EE07 | JR NZ,TrapDoor_RestoreAndReturn | |||
| EE09 | SET 1,(HL) | Set "trap door is open / trap door event armed" (bit 01 of GameEventFlags). | ||
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| EE0B | LD A,$05 | Load A with sound index 05. | ||
| EE0D | CALL Queue_Sound | Call Queue_Sound to queue sound. | ||
| EE10 | LD HL,$A7FA | Point HL at the lever open, facing right (GraphicLayout_LeverOpenRight). | ||
| EE13 | LD ($9177),HL | Store HL in the lever layout pointer (Pointer_TrapDoorLayout). | ||
| EE16 | LD HL,$EDC3 | Point HL at the open-trap type list (Data_TrapDoorOpenTypes). | ||
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This entry point is used by the routine at Close_TrapDoor.
Rewrite 06 scenery entity types from the open/close type list starting at 8E87.
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| UpdateTrapDoorEntityTypes | EE19 | LD IX,$8E87 | Point IX at the simple-entity slot at 8E87. | |
| EE1D | LD DE,$000E | Load DE with 000E. | ||
| EE20 | LD B,$06 | Load B with loop count 06. | ||
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Write one type byte into the current trap door scenery slot and advance.
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| UpdateTrapDoorEntityTypes_WriteType | EE22 | LD A,(HL) | Load A with the next type byte. | |
| EE23 | LD (IX+$00),A | Write it to the entity. | ||
| EE26 | INC HL | Advance the trap door script pointer. | ||
| EE27 | ADD IX,DE | Advance IX to the next entity. | ||
| EE29 | DJNZ UpdateTrapDoorEntityTypes_WriteType | Decrease the loop counter in B and jump to UpdateTrapDoorEntityTypes_WriteType if more iterations remain. | ||
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This entry point is used by the routine at Close_TrapDoor.
Exit open/close trap door after updating scenery types (or early abort).
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| TrapDoor_RestoreAndReturn | EE2B | POP DE | Restore DE, HL and IX from the stack. | |
| EE2C | POP HL | |||
| EE2D | POP IX | |||
| EE2F | RET | Return. | ||
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