Basic sequential access methodIn IBM mainframeoperating systems, Basic sequential access method (BSAM) is an access method to read and write datasets sequentially. BSAM is available on OS/360, OS/VS2, MVS, z/OS, and related operating systems. BSAM is used for devices that are naturally sequential, such as punched card readers, punches, line printers, and magnetic tape. It is also used for data on devices that could also be addressed directly, such as magnetic disks.
Execute Channel ProgramIn IBM mainframeoperating systems, Execute Channel Program (EXCP) is a macro generating a system call, implemented as a Supervisor Call instruction, for low-level device access, where the programmer is responsible for providing a channel program—a list of device-specific commands (CCWs)—to be executed by I/O channels, control units and devices.Virtual Storage Access MethodVirtual Storage Access Method (VSAM) is an IBMdirect-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. Originally a record-oriented filesystem, VSAM comprises four data setorganizations: key-sequenced (KSDS), relative record (RRDS), entry-sequenced (ESDS) and linear (LDS).Virtual Telecommunications Access MethodVirtual Telecommunications Access Method (VTAM) is the IBM subsystem that implements Systems Network Architecture (SNA) for mainframe environments. VTAM provides an application programming interface (API) for communication applications, and controls communication equipment such as adapters and controllers.Object access methodObject access method (OAM) is an access method under z/OS which is designed for the storage of large numbers of large files, such as images. It has a number of distinguishing features, e.g. compared to VSAM: OAM datasets do not have an internal record structure; they are accessed as binary data streams. OAM datasets are not directly cataloged. Rather, they are stored into OAM collections, with only the OAM collection being cataloged.
Operating systemSoftware that manages computer hardware resourcesAn operating system (OS) is system software that manages computer hardware and software resources, and provides common services for computer programs. Time-sharing operating systems schedule tasks for efficient use of the system and may also include accounting software for cost allocation of processor time, mass storage, peripherals, and other resources.
Device driverA device driver is software that operates or controls a particular type of device that is attached to a computer. A driver provides a software interface to hardware devices, enabling other software to access hardware functions without needing to know precise details about the hardware. A driver communicates with the device through the computer bus or communications subsystem to which the hardware connects.
MVSMultiple Virtual Storage (MVS) is the most commonly used operating system on the System/370, System/390 and IBM ZIBM mainframe computers. IBM developed MVS, along with OS/VS1 and SVS, as a successor to OS/360. It is unrelated to IBM's other mainframe operating system lines, e.g., VSE, VM, TPF.
OS/VSOS/VS may refer to one of a number of IBM operating systems for System/370 and successors characterized by the use of virtual storage (VS): IBM OS/VS1, successor to MFT II, 1972-1984IBM OS/VS2, successor to MVT, including: OS/VS2 version 1, also known as SVS (Single Virtual Storage), 1972-1974OS/VS2 version 2, also known as MVS (Multiple Virtual Storage), 1974-1981OS/VS1 had no follow-on systems.
Mainframe computerA mainframe computer, informally called a mainframe, maxicomputer, or big iron, is a computer used primarily by large organizations for critical applications like bulk data processing for tasks such as censuses, industry and consumer statistics, enterprise resource planning, and large-scale transaction processing.
APIAn application programming interface (API) is a connection between computers or between computer programs. It is a type of software interface, offering a service to other pieces of software. A document or standard that describes how to build such a connection or interface is called an API specification. A computer system that meets this standard is said to implement or expose an API. The term API may refer either to the specification or to the implementation.
OS/360 and successorsOS/360, officially known as IBM System/360 Operating System, is a discontinued batch processingoperating system developed by IBM for their then-new System/360mainframe computer, announced in 1964; it was influenced by the earlier IBSYS/IBJOB and Input/Output Control System (IOCS) packages for the IBM 7090/7094 and even more so by the PR155 Operating System for the IBM 1410/7010 processors.
Execute Channel ProgramIn IBM mainframeoperating systems, Execute Channel Program (EXCP) is a macro generating a system call, implemented as a Supervisor Call instruction, for low-level device access, where the programmer is responsible for providing a channel program—a list of device-specific commands (CCWs)—to be executed by I/O channels, control units and devices.Virtual Storage Access MethodVirtual Storage Access Method (VSAM) is an IBMdirect-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. Originally a record-oriented filesystem, VSAM comprises four data setorganizations: key-sequenced (KSDS), relative record (RRDS), entry-sequenced (ESDS) and linear (LDS).Virtual Telecommunications Access MethodVirtual Telecommunications Access Method (VTAM) is the IBM subsystem that implements Systems Network Architecture (SNA) for mainframe environments. VTAM provides an application programming interface (API) for communication applications, and controls communication equipment such as adapters and controllers.Object access methodObject access method (OAM) is an access method under z/OS which is designed for the storage of large numbers of large files, such as images. It has a number of distinguishing features, e.g. compared to VSAM: OAM datasets do not have an internal record structure; they are accessed as binary data streams. OAM datasets are not directly cataloged. Rather, they are stored into OAM collections, with only the OAM collection being cataloged.Operating systemSoftware that manages computer hardware resourcesAn operating system (OS) is system software that manages computer hardware and software resources, and provides common services for computer programs. Time-sharing operating systems schedule tasks for efficient use of the system and may also include accounting software for cost allocation of processor time, mass storage, peripherals, and other resources.Device driverA device driver is software that operates or controls a particular type of device that is attached to a computer. A driver provides a software interface to hardware devices, enabling other software to access hardware functions without needing to know precise details about the hardware. A driver communicates with the device through the computer bus or communications subsystem to which the hardware connects.MVSMultiple Virtual Storage (MVS) is the most commonly used operating system on the System/370, System/390 and IBM ZIBM mainframe computers. IBM developed MVS, along with OS/VS1 and SVS, as a successor to OS/360. It is unrelated to IBM's other mainframe operating system lines, e.g., VSE, VM, TPF.OS/VSOS/VS may refer to one of a number of IBM operating systems for System/370 and successors characterized by the use of virtual storage (VS): IBM OS/VS1, successor to MFT II, 1972-1984IBM OS/VS2, successor to MVT, including: OS/VS2 version 1, also known as SVS (Single Virtual Storage), 1972-1974OS/VS2 version 2, also known as MVS (Multiple Virtual Storage), 1974-1981OS/VS1 had no follow-on systems.Mainframe computerA mainframe computer, informally called a mainframe, maxicomputer, or big iron, is a computer used primarily by large organizations for critical applications like bulk data processing for tasks such as censuses, industry and consumer statistics, enterprise resource planning, and large-scale transaction processing.APIAn application programming interface (API) is a connection between computers or between computer programs. It is a type of software interface, offering a service to other pieces of software. A document or standard that describes how to build such a connection or interface is called an API specification. A computer system that meets this standard is said to implement or expose an API. The term API may refer either to the specification or to the implementation.OS/360 and successorsOS/360, officially known as IBM System/360 Operating System, is a discontinued batch processingoperating system developed by IBM for their then-new System/360mainframe computer, announced in 1964; it was influenced by the earlier IBSYS/IBJOB and Input/Output Control System (IOCS) packages for the IBM 7090/7094 and even more so by the PR155 Operating System for the IBM 1410/7010 processors.*As an Amazon Associate I earn from qualifying purchases.