List of Abbreviations

ABEND

A B n o r m a l END

ACB

Access Control Block

ACF/NCP

Advanced Communications

 

Facility/Network Control

 

Program

ACF/SSP

Advanced Communications

 

Facility/???

ACIF

AFP Conversion and Indexing

 

Facility

ACS

Automatic Class Selection

ADSTAR

ADvanced STorage And

 

Retrieval

AFF

AFFinity

AFP

Advanced Function

 

Presentation

AFPDS

Advanced Function Printing

 

Data Stream

AIX

Advanced Interactive

 

eXecutive

AMA

Automatic Message

 

Accounting

AMODE

Addressing MODE

AMS

Access Method Services

ANSI

American National Standards

 

Institute

AOR

Application Owning Region

APAR

Authorized Program Analysis

 

Report

APF

Authorized Program Facility

API

Application Program Interface

APPC

Advanced

 

Program-to-Program

 

Communication

APPL

APPLication

APPLID

APPLication IDentifier

APPN

Advanced Peer-to-Peer

 

Networking

AR

Application Requester

ASCII

American National Standard

 

Code for Information

 

Interchange

ASID

Address Space IDentifier

ATM

Asynchronous Transfer Mode

BCD

Binary Coded Decimal

BCP

Basic Control Program

BCS

Basic Catalog Structure

BDAM

Basic Direct Access Method

BDT

Batch Data Interface

BG

BackGround

BISAM

Basic index Sequential

 

Access Method

BLL

Base Locator for Linkage

BLP

Bypass Label Processing

BOS

Basic Operating System

BPAM

Basic Partitioned Access

 

Method

BSAM

Basic Sequential Access

 

Method

BSC

Binary Synchronous

 

Communication

BSD

Berkeley Software

 

Distribution

BSF

Back Space File

BSL

Basic Systems Language

BSR

Back Space Record

BTAM

Basic Telecommunications

 

Access Method

BTAM-ES

BTAM-Extended Support

BWO

Backup-While-Open

C + +

A programming language, a

 

preprocessor to C

CA

Control Area

CAT

CATalog

CBIPO

Custom Built Initial Program

 

Offering

CBPDO

Custom-Built Product Delivery

 

Option

CCB

Channel Command Block

CCH

Channel Check Handler

CCCA

Cobol CICS Conversion Aid

CCW

Channel Command Word

CD

Compact Disc

CD-ROM

Compact Disk - Read Only

 

Memory

CEC

Central Electronics Complex

CEE

Common Execution

 

Environment

CEMT

CICS Master Terminal

 

Transaction

© Copyright IBM Corp. 1998

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IBM OS/390 manual List of Abbreviations, 583

OS/390 specifications

IBM OS/390, a versatile operating system, was a cornerstone in enterprise environments and played a pivotal role in mainframe computing. Released in the mid-1990s, OS/390 combined the strengths of IBM's MVS (Multiple Virtual Storage) with new features and enhancements, targeting scalability, reliability, and performance in demanding business applications.

One of the key features of OS/390 was its robust support for multiple users and processes. The system allowed thousands of concurrent users to access applications and data, ensuring high availability and minimizing downtime—a critical requirement for many large organizations. This scalability was supported through various enhancements in memory management and processor scheduling, enabling optimal resource allocation across diverse workloads.

OS/390 was known for its superior workload management capabilities. The Workload Manager (WLM) component allowed administrators to define service policies, specifying how system resources would be allocated according to the priority of tasks. This ensured that critical business processes received the necessary resources while less critical tasks were managed more flexibly.

Another significant characteristic of OS/390 was its commitment to security. The operating system provided comprehensive security features, including user authentication, data encryption, and auditing capabilities. This focus on security was vital for organizations handling sensitive data, ensuring compliance with regulations and safeguarding against unauthorized access.

OS/390 also supported advanced technologies that facilitated integration and development. The system included features like the IBM CICS (Customer Information Control System) for transaction processing and IMS (Information Management System) for database management. These technologies allowed organizations to build robust, high-performance applications tailored to specific business needs.

The ease of network integration was another strength of OS/390. With the advent of the Internet and global connectivity, OS/390 systems could easily interface with various network protocols, enabling businesses to operate in a connected world. This inclusion paved the way for many organizations to expand their capabilities and offer new services, driving digital transformation.

In conclusion, IBM OS/390 represented a significant advancement in mainframe technology, combining scalability, security, and robust workload management. Its rich feature set and support for critical enterprise applications solidified its role as a vital component of many organizations' IT infrastructures, ensuring they could meet their operational challenges head-on while supporting future growth. As technology continues to evolve, the legacy of OS/390 remains influential in the realm of computing.