including these reference numbers is to alert IBM customers to specific information relative to the implementation of the PTF when it becomes available to each customer according to the normal IBM PTF distribution process.

The following terms are trademarks of the International Business Machines Corporation in the United States and/or other countries:

3090

ACF/VTAM

AD/Cycle

ADSTAR

Advanced Function Presentation

Advanced Function Printing

Advanced Peer-to-Peer Networking

AFP

AIX

AnyNet

APPN

AS/400

BookManager

BookMaster

C/370

CallPath

CBIPO

CBPDO

CICS

CICS/ESA

CICS/MVS

CICS/VSE

CICSPlex

COBOL/370

Common User Access

CT

CUA

Current

DataHub

DataJoiner

DataPropagator

DataRefresher

DB2

DFSMS

DFSMS/MVS

DFSMSdfp

DFSMSdss

DFSMShsm

DFSMSrmm

DFSORT

Distributed Relational Database

DRDA

Architecture

 

ECKD

eNetwork

ES/9000

ESA/370

ESA/390

ESCON

FFST

FunctionPac

GDDM

Hardware Configuration Definition

Hiperbatch

IBM

ImagePlus

IMS

IMS/ESA

InfoPrint

Intelligent Printer Data Stream

IP PrintWay

IPDS

MO:DCA

MQSeries

Multiprise

MVS

MVS/DFP

MVS/ESA

MVS/SP

MVS/XA

Net.Data

NetSpool

NetView

OfficeVision

OPC

Open Class

OpenEdition

Operating System/2

OS/2

OS/390

OS/400

Parallel Sysplex

PR/SM

Print Services Facility

Processor Resource/Systems Manager

ProductPac

PSF

PSF/6000

QMF

RACF

RAMAC

Resource Measurement Facility

RETAIN

RMF

RS/6000

S/370

S/390

SAA

ServicePac

SOMobjects

SP

SQL Master

SQL/DS

554VSE to OS/390 Migration Workbook

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IBM OS/390 Acf/Vtam, Adstar, Afp, Aix, Appn, Cbipo Cbpdo Cics CICS/ESA CICS/MVS CICS/VSE, COBOL/370, Cua, Dfsort, Drda

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.