z/Architecture
Sign in to savez/Architecture, initially and briefly called ESA Modal Extensions (ESAME), is IBM's 64-bit complex instruction set computer (CISC) instruction set architecture, implemented by its mainframe computers. IBM introduced its first z/Architecture-based system, the z900, in late 2000. Subsequent z/Architecture systems include the IBM z800, z990, z890, System z9, System z10, zEnterprise 196, zEnterprise 114, zEC12, zBC12, z13, z14, z15, z16, and z17.
In the Vinony graph
Within Vinony's link graph, z/Architecture is referenced by 307 other articles, and connects out to IBM Z, processor register and CPU cache.
Vinony files it under 64-bit computers, Accuracy disputes from July 2025 and Computer-related introductions in 2000.
Its subject is documented across 8 Wikipedia language editions.
Wikidata facts
- Instance of
- instruction set architecture
- Follows
- IBM S/390
- Said to be same as
- IBM Z
via Wikidata · CC0
~88 min read
Encyclopedic overview
39 sectionsContents
- Features
- Extended-immediate facility
- General-instructions-extension facility
- High-word facility
- Long-displacement facility
- Miscellaneous-instruction-extensions Facility 1
- Miscellaneous-instruction-extensions Facility 2
- Miscellaneous-instruction-extensions Facility 3
- Vector facility
- Neural-network-processing-assist facility
- Registers
- Access registers
- Breaking-event-address register (BEAR)
- Control registers
- Floating-point Control (FPC) register
- Floating-point registers
- General registers
- Prefix register
- Program status word (PSW)
- Vector registers
- Memory
- Addressing
- Types of main storage addresses
- Address encoding
- Addressing modes
- Translation modes
- Operating system support
- z/OS
- Code (or mixed) spaces
- Data-only spaces
- {{anchor}}Dataspaces and hiperspaces
- IBM mainframe expanded storage
- MVPG and ADMF
- MVPG
- ADMF
- Non-IBM implementations
- Notes
- References
- Further reading
z/Architecture, initially and briefly called ESA Modal Extensions (ESAME), is IBM's 64-bit complex instruction set computer (CISC) instruction set architecture, implemented by its mainframe computers. IBM introduced its first z/Architecture-based system, the z900, in late 2000. Subsequent z/Architecture systems include the IBM z800, z990, z890, System z9, System z10, zEnterprise 196, zEnterprise 114, zEC12, zBC12, z13, z14, z15, z16, and z17.
z/Architecture retains backward compatibility with previous 32-bit-data/31-bit-addressing architecture ESA/390 and its predecessors back to the 32-bit-data/24-bit-addressing System/360. The IBM z13 is the last z Systems server to support running an operating system in ESA/390 architecture mode. However, all 24-bit and 31-bit problem-state application programs originally written to run on the ESA/390 architecture will be unaffected by this change.
Excerpted from Wikipedia’s “z/Architecture” article, available under the CC BY-SA 4.0 licence.