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  2. IBM System/370-XA - Wikipedia

    en.wikipedia.org/wiki/IBM_System/370-XA

    IBM documentation numbers the bits from high order to low order; the most significant (leftmost) bit is designated as bit number 0. IBM System/370-XA is an instruction set architecture introduced by IBM in 1983 with the IBM 308X processors. It extends the IBM System/370 architecture to support 31-bit virtual and physical addresses, and includes ...

  3. IBM Enterprise Systems Architecture - Wikipedia

    en.wikipedia.org/wiki/IBM_Enterprise_Systems...

    IBM Enterprise Systems Architecture is an instruction set architecture introduced by IBM as ESA/370 in 1988. It is based on the IBM System/370-XA architecture.. It extended the dual-address-space mechanism introduced in later IBM System/370 models by adding a new mode in which general-purpose registers 1-15 are each associated with an access register referring to an address space, with ...

  4. IBM System/370 - Wikipedia

    en.wikipedia.org/wiki/IBM_System/370

    The IBM System/370 (S/370) is a range of IBM mainframe computers announced as the successors to the System/360 family on June 30, 1970. The series mostly [ b ] maintains backward compatibility with the S/360, allowing an easy migration path for customers; this, plus improved performance, were the dominant themes of the product announcement.

  5. IBM Basic assembly language and successors - Wikipedia

    en.wikipedia.org/wiki/IBM_Basic_assembly...

    The successors to BAL use the native instruction sets of the IBM mainframe architectures on which they run, including System/360, System/370, System/370-XA, ESA/370, ESA/390, and z/Architecture. The simplicity of machine instructions means that the source code of a program written in assembler will usually be much longer than an equivalent ...

  6. IBM System/360 architecture - Wikipedia

    en.wikipedia.org/wiki/IBM_System/360_architecture

    The IBM System/360 architecture is the model independent architecture for the entire S/360 line of mainframe computers, including but not limited to the instruction set architecture. The elements of the architecture are documented in the IBM System/360 Principles of Operation [1] [2] and the IBM System/360 I/O Interface Channel to Control Unit ...

  7. Instructions per second - Wikipedia

    en.wikipedia.org/wiki/Instructions_per_second

    Instructions per second (IPS) is a measure of a computer's processor speed. For complex instruction set computers (CISCs), different instructions take different amounts of time, so the value measured depends on the instruction mix; even for comparing processors in the same family the IPS measurement can be problematic.

  8. IBM System/370 Model 115 - Wikipedia

    en.wikipedia.org/wiki/IBM_System/370_Model_115

    Website. Official website IBM Archives. The IBM System/370 Model 115 was announced March 13, 1973, [1] at that time the low-end model of the System/370 line. It was promoted as "an ideal System/370 entry system for users of IBM's System/3, 1130 computing system and System/360 Models 20, 22 and 25 ." The Model 115 was withdrawn on March 9, 1981.

  9. Reduced instruction set computer - Wikipedia

    en.wikipedia.org/wiki/Reduced_instruction_set...

    The Sun Microsystems UltraSPARC processor is a type of RISC microprocessor. In electronics and computer science, a reduced instruction set computer ( RISC) is a computer architecture designed to simplify the individual instructions given to the computer to accomplish tasks. Compared to the instructions given to a complex instruction set ...

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