BS2000

BS2000 (since 1992, the official name BS2000/OSD) is the mainframe operating system platform from Fujitsu Technology Solutions. The name is also often used synonymously for users of the mainframe computer of Siemens / FTS.

Mainframe systems are optimized parallel install many programs on a computer and can be run. Thus, the required number of computers can be kept small. Originally could be saved as costs for the earlier more expensive hardware components. Today, the advantage of an architecture that makes do with far fewer computers lies in the fact that by the complexity of the IT infrastructure is significantly lower. This reduces operating costs and increases robustness.

Thus, affect various applications and users not mutually on one computer, mainframe systems, the various users and the processes can foreclose optimally from each other. You do that through the virtualization of all resources used by the applications and by a differentiated, controlled by access rights and priorities centralized resource management.

The high degree of virtualization decouples the same time, the application software of hardware and implementation details and thus forms the basis for long-term compatibility, high flexibility, high availability, scalability, and robustness of large applications running on mainframes Services.

Unlike other mainframe systems offers BS2000/OSD in all operating modes (batch, interactive mode and online transaction processing ), and regardless of whether it runs natively or as a guest in a virtual machine, exactly the same interface. This uniformity of the user interface and the entire BS2000 software configuration makes the administration and automation very easy.

BS2000/OSD is mainly distributed in the European market. In Germany, it is the most widely used mainframe system according to IBM mainframe systems. In the public sector, the banking and insurance sectors, but also in industry mainframes because of their architecture -related reliability, availability and scalability for many core applications, the first choice.

History

In evolutionary terms, has its roots in the BS2000/OSD operating system TSOS ( timesharing operating system ), which was developed by RCA for the first model / 45 of Spectra/70-Serie. These hosts line in the late 1960s the architecture of the IBM S/360-Serie was modeled. After a patent dispute with IBM RCA ceased production and development of hardware and software.

Siemens took over the development independently and the distribution based on the TSOS developed BBS ( band Operation System ) with its own hardware (System 4004 ). The hardware based initially on exact copies of the RCA designs, which were but newly released. The mechanical parts were changed from imperial to metric. With the Model 4004/151 and / 220 the switch was on / 370 architecture with virtual addressing. It was one of the first operating systems in general, where consistently the principle of virtual addressing and a foreclosed address space for programs of different users has been introduced. From TSOS the operating system inherited the consistent structuring in a uniform, sales and / or block-oriented file interface, so that unnecessary device dependencies could be avoided in user programs.

With the establishment of the Unidata network by Bull, Phillips and Siemens Siemens mainframe computers were sold under the name 7000. With the internal and X - CPUs ( X1, X3, X4) designated workstations, the instruction set has been extended. The non - privileged instruction set corresponded to continue the / 370, but was extended for example, hardware stack and bit manipulation instructions. There were four instead of three functional states (P1 = User, P2 = System, P3 = Interrupt, P4 = machine error ) are available.

Compared to competing operating systems (notably IBM ) was BS2000 easier for users to use, as there was in particular when accessing the file system is less configurable, - what but besides the somewhat limited flexibility restricting the tuning options. The abbreviation TSOS remained until today as a user account, it corresponds to the root identifier of Unix systems.