CPU Architecture
CPU Architecture Less


to get instant updates about 'Z/Architecture' on your MyPage. Meet other similar minded people. Its Free!


All Updates

z/Architecture, initially and briefly called ESA Modal Extensions (ESAME), refers to IBM's 64-bit computing architecture for the current generation of IBM mainframe computers. IBM introduced its first z/Architecture-based system, the zSeries Model 900, in late 2000. Later z/Architecture systems included the IBM z800, z990, z890, System z9 and the System z10. z/Architecture retains backward compatibility with previous 32-bit-data/31-bit-addressing architecture ESA/390 and its predecessors all the way back to the 32-bit-data/24-bit-addressing System/360.

The operating systems running on z/Architecture systems vary in how much they exploit the 64-bit design. Currently most operating systems, including z/OS, continue to restrict code execution to the first 2 GB (31 bits) of each virtual address space solely for reasons of efficiency and compatibility rather than architectural limits, allowing only data objects to reach into the higher 64-bit addressing ranges. Since z/OS's virtual memory implementation supports multiple 2 GB address spaces, this "restriction" still permits much more than 2 GB of concurrently resident program code. The 64-bit version of Linux on System z allows code to execute from 64-bit address ranges.

Among the other major operating systems, z/VSE Version 4, z/TPF Version 1, and z/VM Version 5, and presumably their successors, all require z/Architecture.

z/Architecture supports running multiple concurrent operating systems and applications even if they...
Read More

No feeds found

wait Posting your question. Please wait!...


CPU Architecture
No messages found
Tell your friends >
about this page
 Create a new Page
for companies, colleges, celebrities or anything you like.Get updates on MyPage.
Create a new Page
 Find your friends
  Find friends on MyPage from