Using z/CMS

z/CMS is supplied as a predefined named saved system called ZCMS and as an IPLable nucleus on the MAINT 990 minidisk. The system disk (S-disk) for z/CMS is still the MAINT 190 minidisk. The z/CMS nucleus is built using VMSES/E in a manner similar to building the CMS nucleus, except that the ZCMSLOAD build list is used instead of the CMSLOAD build list, and the responses to the system for prompts issued during nucleus generation are obtained from the DEFNUC macro in the DMSZNGP file instead of the DMSNGP file. For more information, see DEFNUC Macro.

To use z/CMS, you can IPL the ZCMS named saved system or you can link to the MAINT 990 minidisk and then IPL 990. To IPL 990 you need at least 20 MB of virtual storage. After being IPLed in an ESA/390 (ESA or XA) virtual machine, z/CMS switches the virtual machine to z/Architecture mode and thereafter executes in that mode.

If you have programs that have dependencies on control blocks changed for z/CMS (see Mapping Files), you will need to reassemble those programs. To use any of the z/Architecture macros, you must issue a GLOBAL MACLIB command to specify the DMSZGPI MACLIB ahead of the DMSGPI MACLIB. For example:

global maclib dmszgpi dmsgpi