8. z/Architecture and addressing
z/Architecture is the next step in the evolution from the System/360™ to the System/370™, System/370 extended architecture (370-XA), Enterprise Systems Architecture/370* (ESA/370),and Enterprise Systems Architecture/390® (ESA/390). In order to understand z/Architecture you have to be familiar also with the basics of ESA/390 and its predecessors.
An address space maps all of the available addresses, and includes system code and data as well as user code and data. Thus, not all of the mapped addresses are available for user code and data. This limit on user applications was a major reason for System/370 Extended Architecture (370-XA) and MVS/XA™. Because the effective length of an address field expanded from 24 ...
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