Routines
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9273: Find Inventory Item
Used by the routines at HandlerDracula, HandlerFrankenstein and CheckDoorKey.
Looks for an item in the three slots of the inventory (see Inventory_Slot1). The sprite ID and the attribute of the item are at offsets 02 and 03 of each slot.
Input
D The attribute of the item
E The sprite ID of the item
Output
F The Z flag is set if the player has the item
FindInventoryItem 9273 LD B,$03 B=03 (the number of slots in the inventory).
9275 LD HL,$5E32 Point HL at the sprite ID of the first slot at Inventory_Slot1_Sprite_Id.
FindInventoryItem_Loop 9278 LD A,(HL) Fetch the sprite ID of the slot.
9279 CP E Is it the sprite ID of the item?
927A INC HL Move HL on to the attribute of the slot.
927B JR NZ,FindInventoryItem_Next Jump to FindInventoryItem_Next if they are different.
927D LD A,(HL) Fetch the attribute of the slot.
927E CP D Return if the attribute matches too, as the player has the item.
927F RET Z
FindInventoryItem_Next 9280 INC HL Move HL on to the next slot.
9281 INC HL
9282 INC HL
9283 DJNZ FindInventoryItem_Loop Decrease the slot counter by one and loop back to FindInventoryItem_Loop until all three slots have been checked.
9285 RET Return.
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