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.
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.