System/360

System/360 is a family of mainframe computers developed by International Business Machines Corporation (IBM) in the 1960s, which revolutionized the computer industry with its innovative design and compatibility. The System/360 was announced on April 7, 1964, by Thomas J. Watson Jr., the president of IBM at the time, and was designed to replace the earlier IBM 1401 and IBM 7090 series. The development of the System/360 involved a team of engineers and researchers from IBM Research, including Gene Amdahl, Fred Brooks, and Ernst Mayr, who worked together to create a compatible and scalable computer system. The System/360 was also influenced by the work of John von Neumann, Alan Turing, and Konrad Zuse, who made significant contributions to the development of modern computer architecture.

Introduction

The System/360 was a groundbreaking computer system that introduced a new concept of compatibility and scalability, allowing customers to upgrade or downgrade their systems as needed. The System/360 was designed to be compatible with a wide range of IBM peripherals, including the IBM 1403 printer and the IBM 2301 disk storage unit. The system was also compatible with software written for earlier IBM systems, such as the IBM 7090 and IBM 1401. The System/360 was used by a wide range of organizations, including NASA, United States Department of Defense, Federal Reserve, and University of California, Berkeley. The system was also used by many Fortune 500 companies, including General Motors, Ford Motor Company, and Procter & Gamble.

History

The development of the System/360 began in the early 1960s, when IBM realized that its existing computer systems were not compatible with each other. The company assembled a team of engineers and researchers, led by Fred Brooks, to develop a new computer system that would be compatible and scalable. The team worked closely with IBM Research and MIT Computer Science and Artificial Intelligence Laboratory to develop the System/360 architecture. The System/360 was announced on April 7, 1964, and was initially available in six different models, ranging from the IBM System/360 Model 20 to the IBM System/360 Model 90. The system was widely adopted by organizations around the world, including Harvard University, Stanford University, and University of Oxford. The System/360 also played a significant role in the development of the ARPANET, the precursor to the modern-day Internet.

Architecture

The System/360 architecture was designed to be highly scalable and compatible, with a range of models that could be upgraded or downgraded as needed. The system used a byte-addressable memory architecture, with a 32-bit word length and a binary-coded decimal (BCD) instruction set. The System/360 also introduced a new concept of channel programming, which allowed peripherals to be connected to the system using a standardized interface. The system was designed to be highly reliable, with features such as error correction and redundancy built into the hardware. The System/360 architecture was influenced by the work of John Cocke, Herb Grosch, and Gerald Estrin, who made significant contributions to the development of modern computer architecture. The system was also compatible with a wide range of IBM peripherals, including the IBM 2311 disk storage unit and the IBM 2540 card reader.

Models

The System/360 was available in a range of models, each with its own unique characteristics and features. The IBM System/360 Model 20 was the smallest and most affordable model, while the IBM System/360 Model 90 was the largest and most powerful. The IBM System/360 Model 30 and IBM System/360 Model 40 were mid-range models that offered a balance of performance and price. The IBM System/360 Model 50 and IBM System/360 Model 60 were high-end models that offered advanced features such as multiprocessing and virtual memory. The System/360 models were widely adopted by organizations around the world, including NASA, United States Department of Defense, and University of California, Los Angeles. The system was also used by many Fortune 500 companies, including General Electric, DuPont, and 3M.

Operating Systems

The System/360 was supported by a range of operating systems, including IBM System/360 Operating System (OS/360) and IBM Time Sharing System (TSS/360). The OS/360 was a batch processing operating system that was designed to manage the execution of programs and the allocation of system resources. The TSS/360 was a time-sharing operating system that allowed multiple users to access the system simultaneously. The System/360 also supported other operating systems, including IBM CP-67 and IBM VM/370. The system was widely used by organizations around the world, including Harvard University, Stanford University, and University of Oxford. The System/360 also played a significant role in the development of the ARPANET, the precursor to the modern-day Internet, which was funded by the United States Department of Defense and developed by Vint Cerf and Bob Kahn.

Impact and Legacy

The System/360 had a significant impact on the computer industry, introducing a new concept of compatibility and scalability that revolutionized the way organizations used computers. The system was widely adopted by organizations around the world, including NASA, United States Department of Defense, and University of California, Berkeley. The System/360 also played a significant role in the development of the mainframe computer industry, which dominated the computer market for many years. The system's influence can be seen in the work of IBM, Microsoft, Oracle Corporation, and SAP SE, which have all developed computer systems and software that owe a debt to the System/360. The System/360 also influenced the development of the Internet, which was initially designed to connect System/360 computers at different locations. The system's legacy can be seen in the many IBM systems that followed, including the IBM System/370, IBM System/390, and IBM zSeries. The System/360 is now recognized as one of the most important computer systems of all time, and its influence can still be seen in the modern computer industry. The system was also recognized by the National Medal of Technology and Innovation, which was awarded to IBM in 1988 for its development of the System/360. The System/360 is also on display at the Computer History Museum in Mountain View, California, which recognizes its significance in the development of the computer industry.

Category:Mainframe computers