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A4C3: Is the object open?
Tests bit 5 of the flags of the object at IX (Z reset if open) and returns A=5, the state code for A09C.
A4C3 BIT 5,(IX+$07) Is it open?
A4C7 LD A,$05 A = the state code for OPEN/CLOSED, in case the caller needs to report it
A4C9 RET Z reflects the answer
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