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A mainframe computer, informally called a mainframe or big iron, [1] is a computer used primarily by large organizations for critical applications like bulk data processing for tasks such as censuses, industry and consumer statistics, enterprise resource planning, and large-scale transaction processing.
The IBM System/360 (S/360) is a family of mainframe computer systems announced by IBM on April 7, 1964, [1] and delivered between 1965 and 1978. [2] System/360 was the first family of computers designed to cover both commercial and scientific applications and a complete range of applications from small to large.
An incompatible small computer, the IBM 1130 introduced the following year, was designed for scientific and engineering computing. The design of the Model 20 was the result of a tug of war within IBM. John Haanstra had wanted a low-end machine that could execute IBM 1401 instructions. Fred Brooks wanted the machine to have System/360 architecture.
The Model 30 was a popular IBM mainframe which was announced in 1964 as the least powerful of the System/360s. [NB 1] The System/360 series was the first line of computers in the world to allow machine language programs to be written that could be used across a broad range of compatible machines of different sizes.
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 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 ...
The processor unit chip (PU chip) has 12 cores. The z15 cores support two-way simultaneous multithreading. [3]The cores implement the CISC z/Architecture with a superscalar, out-of-order pipeline.
The IBM 308X is a line of mainframe computers, of which the first model, the Model 3081 Processor Complex, was introduced November 12, 1980. [1] [NB 1] It consisted of a 3081 Processor Unit with supporting units. Later models in the series were the 3083 [2] and the 3084. [3] The 3083 was announced March 31 and the 3084 on September 3, both in 1982.