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BS2000 : ウィキペディア英語版
BS2000

BS2000 (renamed BS2000/OSD in 1992) is a mainframe computer operating system developed by Fujitsu Technology Solutions.〔(BS2000/OSD Strategy, March 2010 )〕
Unlike other mainframe systems, BS2000/OSD provides exactly the same user and programming interface in all operating modes (batch, interactive and online transaction processing) and regardless of whether it is running natively or as a guest system in a virtual machine. This uniformity of the user interface and the entire BS2000 software configuration makes administration and automation particularly easy.
==History==
BS2000/OSD had 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 systems 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.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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