BS2000 has its roots in the
Time Sharing Operating System (TSOS) first developed by
RCA for the /46 model of the
Spectra/70 series, a computer family of the late 1960s related in its architecture to
IBM's
/360 series. It was an early operating system which used
virtual addressing and a segregated
address space for the programs of different users. From the outset TSOS also allowed data
peripherals to be accessed only via record- or block-oriented file interfaces, thereby preventing the necessity to implement device dependencies in user programs. The same operating system was also sold to Sperry Univac when it bought most of RCA's computer division. Univac's "
fork" of TSOS would become
VS/9, which used many of the same concepts.
1970s In 1973, BS2000 V1.0 was a port of the TSOS operating system to models of the
Siemens system 7.700 In June 1975, Siemens shipped the enhanced BS2000 V2.0 version of the TSOS operating system for the models of the Siemens 7.700 mainframe series for the first time under the name BS2000. This first version supported
disk paging and three different operating modes in the same system: interactive dialog, batch, and transaction mode, a precursor of
online transaction processing. In 1977, the TRANSDATA communication system used
computer networking. In 1978,
multiprocessor technology was introduced. The operating system had the ability to cope with a processor failure. At the same time the new technology considerably extended the performance range of the system. In 1979, a
transaction processing monitor, the
Universal Transaction Monitor (UTM), was introduced, providing support for online transaction processing as an additional operating mode.
1980s In 1980, Siemens introduced the system 7.500 hardware family, ranging from desk size models for use in office environments to large models with water cooling. In 1987, BS2000 V9.0 was ported to the
/370 architecture supported 2GB
address spaces, 512
processes and the
XS channel system (Dynamic Channel Subsystem).
2010s In 2012, BS2000/OSD version 9.0 was released. Pilot release of version 10.0 started in November 2014, and it was released in May 2015. Pilot release of version 11.0 started in March 2017, and it was released in July 2017.
2020s Pilot release of version DX V1.0(v21.0) started in March 2021, and it was released in July 2021. Pilot release of version DX V1.0B(v21.0B) started in September 2023, and it was released in November 2023. Pilot release of version DX V1.0C(v21.0C) started in January 2026. ==See also==