Routines
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D224: Fetch Location Data Pointer
Used by the routines at ReadRoomDisplayParameter, CharacterAction_InspectorLestrade, PointToLocationDataPlusOne, TestLowBitsOfCharacter, TestLowBitsOfGraphics, SetObjectPointers, ProcessLocationToken, DescribeCurrentRoom, FetchCurrentCharacterLocation, ProcessObjectEntryAlternate, GetLocationExitData, StoreMatchedCharacterRoom and CheckCharacterForRoomGraphics.
Turns a room id into the address of that room's data.
Input
A Room ID
Output
IX Pointer to location data
FetchLocationDataPointer D224 PUSH DE Use the locations at Table_Locations.
D225 LD DE,$840B
D228 PUSH HL
D229 LD L,A
D22A LD H,$00
D22C ADD HL,HL Double the room id, because each location entry is a word.
D22D ADD HL,DE Add the base table address to the offset to point to the requested room address.
D22E LD E,(HL) Read the location address for this room.
D22F INC HL
D230 LD D,(HL)
D231 PUSH DE
D232 POP IX
D234 POP HL Restore the saved pointer and the saved source from the stack.
D235 POP DE
D236 RET Return.
View the equivalent code in;
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