MAP: Identify the Map to Be Accessed

MAP=INDEX

Specifies that the VTOC index map (VIXM) is to be accessed and a count of unallocated VIRs returned. COUNT=YES must also be coded.

MAP=VOLUME

For indexed VTOCs, specifies that the VTOC pack space map (VPSM) is to be accessed and information on unallocated extents of pack space returned.

For nonindexed VTOCs, specifies that the information from the free space DSCBs on unallocated extents is to be returned.

For indexed and nonindexed VTOCs, EXTENTS=addr and COUNT=NO must also be coded.

MAP=VTOC

Specifies that the VTOC map of DSCBs (VMDS) is to be accessed and a count of format-0 DSCBs returned. COUNT=YES must also be coded.