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42821: Process Location Data If Valid
Used by the routine at ProcessObject_Display.
ProcessLocationDataIfValid 42821 JR NC,ProcessObjectAttribute Jump to ProcessObjectAttribute if ?? is greater than or equal to 1.
42823 PUSH HL Stash HL on the stack.
42824 CALL PointToLocationDataPlusOne Call PointToLocationDataPlusOne.
42827 CALL CheckObjectAttributeWithFlag_Wrapper Call CheckObjectAttributeWithFlag_Wrapper.
42830 POP HL Restore HL from the stack.
42831 XOR A A=0.
42832 RET Return.
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