=> R0 = 33 (Get usage of offset)
R1 = pointer to name of any object on image
R2 = offset into image file or disc
R3 = pointer to buffer to receive object name
R4 = buffer length
R6 = pointer to special field, or 0 if not present
<= Buffer contains object name (may be corrupted if not found)
R2 = Object type
Other registers preserved
This call scans a disc or image file to find which object occupies a particular disc address, implementing OS_FSControl 52.
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