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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 ...
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 ...
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.
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 ...
t. e. 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.
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 ...
IBM mainframe. IBM mainframes are large computer systems produced by IBM since 1952. During the 1960s and 1970s, IBM dominated the computer market with the 7000 series and the later System/360, followed by the System/370. Current mainframe computers in IBM's line of business computers are developments of the basic design of the System/360.
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 ...