M
MACLIB (Macro Library)
Think of
.hheader files in C.
- This is a partitioned data set that contains macros or utility assembly programs.
Macro
Think of
.hheader files in C.
- A macro is a utility assembly program that can be used by other programs.
MCAT (Master Catalog)
In order to find data sets on the system a catalog needs to be used for lookup since data sets are not stored in a hierarchical file system)
- System wide catalog for maintaining information about where to find DASD volumes and data sets.
Member
A member is a lot like a file in a folder.
- One logical file that is a member of a partitioned data set.
Microcode
- This is a synonym for firmware.
MIPS (Million Instructions Per Second)
- This is a unit that is often used to measure mainframe CPU processing power.
Monoplex
- A monoplex is a type of sysplex that contains only one z/OS. In short, a monoplex is a single z/OS that uses a sysplex couple data set.
MVS (Multiple Virtual Storage)
- Refers to an older version of z/OS. However, MVS is still used to refer to the z/OS system.