The Hobbit (v1.0): Routine at A129

A129: Is the target locked or open?

Tests the target's flags: returns Z reset and A=$80 if it is locked; otherwise tests bit 5 and returns A=$85, so Z reset means it is open. The codes in A are for A09C. The entry at A134 does only the second test.
A129	LD IX,($B5F8)	IX = the target's own record
A12D	BIT 0,(IX+$07)	Is it locked?
A131	LD A,$80	A = the state code for LOCKED/UNLOCKED, in case the caller needs to report it
A133	RET NZ	Locked: return with Z reset, telling the caller it cannot be used yet
This entry point is used by the routine at 93ED.
A134	BIT 5,(IX+$07)	Not locked: is it open?
A138	LD A,$85	A = the state code for OPEN/CLOSED, in case the caller needs to report it
A13A	RET	Z reflects whether it is open