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2. Data Facility Storage Management Subsystem (MVS) - Wikipedia

   en.wikipedia.org/wiki/Data_Facility_Storage...

   On May 17, 1983, IBM announced [5] MVS/370 Data Facility Product (MVS/370 DFP), 5665-295, for MVS/SP Version 1 Release 3, replacing [b] the same five programs as DFP for MVS/XA. On February 5, 1985, IBM announced [ 6 ] MVS/XA Data Facility Product (MVS/XA DFP) Version 2, 5655-XA2, as a replacement for MVS/XA Data Facility Product Version 1 ...

3. MVS - Wikipedia

   en.wikipedia.org/wiki/MVS

   MVS/370 is a generic term for all versions of the MVS operating system prior to MVS/XA. [ NB 6 ] The System/370 architecture, at the time MVS was released, supported only 24-bit virtual addresses, so the MVS/370 operating system architecture is based on a 24-bit address.