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Virtual Storage Access Method (VSAM) [1] is an IBM direct-access storage device (DASD) file storage access method, first used in the OS/VS1, OS/VS2 Release 1 (SVS) and Release 2 (MVS) operating systems, later used throughout the Multiple Virtual Storage (MVS) architecture and now in z/OS.
5740-AM3 Sequential Access Method Extended (SAM-E) SAM-E improves the performance of BPAM, BSAM and QSAM on direct access storage devices. 5740-AM8 Access Method Services Cryptographic Option 5748-UT2 Offline 3800 Utility. In June 1980, IBM announced MVS/System Product (MVS/SP) as a replacement for MVS/SE.
An access method is a function of a mainframe operating system that enables access to data on disk, tape or other external devices. Access methods were present in several mainframe operating systems since the late 1950s, under a variety of names; the name access method was introduced in 1963 in the IBM OS/360 operating system. [ 1 ]
Common method of using paging to create a virtual address space Paging (on Intel 80386) with page size of 4K. In addition to adding virtual 8086 mode, the 386 also added paging to protected mode. [39] Through paging, system software can restrict and control a task's access to pages, which are sections of memory.
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In the mid-1970s IBM introduced MVS, which not only supported virtual storage that was larger than the available real storage, [NB 2] as did SVS, but also allowed an indefinite number of applications to run in different address spaces. Two concurrent programs might try to access the same virtual memory address, but the virtual memory system ...
An attempt to access unauthorized [a] memory results in a hardware fault, e.g., a segmentation fault, storage violation exception, generally causing abnormal termination of the offending process. Memory protection for computer security includes additional techniques such as address space layout randomization and executable-space protection .
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