Return Codes from CVAFTST

On return from CVAF, register 15 contains one of the following return codes:

Return Code	Meaning
0 (X'00')	The system does not support an indexed VTOC. The volume should be considered to have a nonindexed VTOC. The UCB was not inspected to determine its validity or status.
4 (X'04')	The system supports an indexed VTOC, but the volume has a nonindexed VTOC.
8 (X'08')	The system supports an indexed VTOC and the volume has an indexed VTOC.
12 (X'0C')	The system supports an indexed VTOC, but the volume is not mounted or the VIB is not initialized for it; thus, the status (indexed or nonindexed) of the VTOC cannot be determined.
16 (X'10')	The system supports an indexed VTOC, but the unit is not a DASD or has a VIO UCB, or the UCB address is not valid. The address of a UCB copy is not valid without a CMXTAREA and a DCEAREA.