From WikiChip
(Redirected from z/Architecture)

z/Architecture is a 64-bit big-endian instruction set architecture introduced by IBM in October 2000 as an extension and successor to the IBM ESA/390.


The z/Architecture was introduced in 2000 with the introduction of the zSeries 900. The ISA was designed as an extension to the ESA/390 and features 64-bit registers, 64-bit operations, and a 64-bit virtual and real address space. Development for z/Architecture in 1996 when IBM determined the ESA/390 had to be extended to 64-bit to overcome its limitations. The new architecture increased the 31-bit address to 64 bit, enough to address 16 exbibytes.

New text document.svg This section requires expansion; you can help adding the missing info.

Text document with shapes.svg This article is still a stub and needs your attention. You can help improve this article by editing this page and adding the missing information.