Routines
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A817: Condition: Item Is Absent
Succeeds when the item operand is not in the current room or the inventory.
Output
F The zero flag is set when the item is absent
Invert the presence test so the condition succeeds when the item is absent.
Condition_ItemIsAbsent A817 LD A,(IX+$01) The operand names the item.
A81A CALL Handler_RunScript_15 FF stands for the matched item.
A81D CALL ValidateItemPresent Call ValidateItemPresent to check whether the matched item is here.
A820 CALL Handler_RunScript_13 Succeed when the item is absent.
A823 JP Handler_RunScript_3 Resume the script.
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