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Service Request Block. A Service Request Block ( SRB) is a data structure of MVS/370 and successor versions of IBM mainframe operating systems employed mainly, but not exclusively, by the Start Input/Output interface. An SRB may be considered, in the abstract, to be a highly optimized Task Control Block (TCB), one which has few, if any ...
A TCB provides an anchor for a linked list of other, related request blocks [3] : 269–301 (RBs); the top-linked RB for a TCB contains the Program status word (PSW) when the task is not assigned to a CPU. When the control program's dispatcher selects a TCB to be dispatched, the dispatcher loads registers from the TCB and loads the PSW from the ...
Tivoli Systems Inc. was founded in Austin, Texas in 1989 by Bob Fabbio [3] and quickly joined by Peter Valdes, Todd Smith and Steve Marcie; all were former IBM employees. [4] Bob Fabbio in an interview indicated the purpose was to provide systems management on systems from a diverse set of vendors while at IBM he had been directed to focus on ...
IBM manufactured magnetic disk storage devices from 1956 to 2003, when it sold its hard disk drive business to Hitachi. [1] [2] Both the hard disk drive (HDD) and floppy disk drive (FDD) were invented by IBM and as such IBM's employees were responsible for many of the innovations in these products and their technologies. [3]
A Supervisor Call instruction ( SVC) is a hardware instruction used by the System/360 family of IBM mainframe computers up to contemporary zSeries, the Amdahl 470V/5, 470V/6, 470V/7, 470V/8, 580, 5880, 5990M, and 5990A, and others; Univac 90/60, 90/70 and 90/80, and possibly others; the Fujitsu M180 (UP) [1] and M200 (MP), and others; and is ...
BIOS interrupt call. BIOS implementations provide interrupts that can be invoked by operating systems and application programs to use the facilities of the firmware on IBM PC compatible [a] computers. Traditionally, BIOS calls are mainly used by DOS programs and some other software such as boot loaders (including, mostly historically ...
International Business Machines Corporation (using the trademark IBM ), nicknamed Big Blue, [6] is an American multinational technology company headquartered in Armonk, New York and present in over 175 countries. [7] [8] IBM is the largest industrial research organization in the world, with 19 research facilities across a dozen countries ...
A service desk has a more broad and user-centered approach which is designed to provide the user with an informed single point of contact for all IT requirements. A service desk seeks to facilitate the integration of business processes into the service management infrastructure.
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