The CVAFTST macro determines whether the system supports an indexed VTOC, and, if it does, whether the VTOC on the unit whose UCB is supplied is indexed or nonindexed.

When you issue CVAFTST, register 13 must contain the address of a standard 18 word save area.

You will get a return code of 12 if CVAFTST cannot determine whether an indexed or nonindexed VTOC is on the unit's volume. You should not receive a return code of 12 from CVAFTST if you have opened a data set (including the VTOC) on the volume.

You need no authorization to issue the CVAFTST macro.

See CVAFDSM Macro Overview and Specification for an example of using the CVAFTST macro with the CVAFDSM macro.

The format of the CVAFTST macro is:

>>-+-------+--CVAFTST--UCB=(reg)-------------------------------><
   '-label-'