PPFA

Page Printer Formatting Aid

PPT

Processing Program Table

PR/SM

Processor Resource/Systems

 

Manager

PROC

PROCedure

PROP

PRogrammable OPerator

PS

Personal System

PSB

Program Specification Block

PSF

Print Service Facility

PSF/6000

Print Service Facility/6000

PTF

Program Temporary Fix

PW

PassWord

QISAM

Queued Indexed Sequential

 

Access Method

QMF

Query Management Facility

QSAM

Queued Sequential Access

 

Method

R/O

Read/Only

R/W

Read/Write

RACF

Resource Access Control

 

Facility

RAMAC

Brand name and trademark of

 

IBM DASD family

RAS

Reliability, Availability,

 

Serviceability

RBA

Relative Byte Address

RC

Reason Code

RCB

Request Control Block

RDO

Resource Definition On-line

RECFM

RECord ForMat

RES

RESident

RETAIN

Remote Technical Assistance

 

Information Network

REXX

REstructured eXtended

 

eXecutor language

RJE

Remote Job Entry

RLS

Record Level Sharing

RMDS

Remote Management and

 

Distribution System

RMF

Resource Measurement

 

Facility

RPC

Remote Procedure Call

RPG

Report Program Generator

RPG II

A commercially Oriented

 

Programming Language

RPL

Request Parameter List

RPM

Remote Print Manager

RRDS

Relative Record Data Set

RSCS

Remote Spooling

 

Communications Subsystem

RSU

Recommended Service

 

Upgrade

RTE

Remote Terminal Emulator

RU

Replaceable Unit

S/360

System/360

S/390

System/390

SAA

Systems Application

 

Architecture

SAE

Strategic Applications

 

Enabling

SAF

System Authorization Facility

SAM

Segmented Access Method

SCD

System Contents Directory

SCLM

Software Configuration &

 

Library Manager

SCS

Spooling Communications

 

System

SDF

Screen Definition Facility

SDF/CICS

Screen Definition

 

Facility/Customer Information

 

Control System

SDLC

Synchronous Data Link

 

Control

SDSF

System Display and Search

 

Facility

SGML

Standard Generalized

 

Mark-up Language

SIE

Software Installation Express

SIS

Sequential Insert Strategy

SIT

System Initialization Table

SLI

Source Library Inclusion

SLIP

Serial Line Internet Protocol

SMF

System Management Facility

SMP

System Modification Program

SMP/E

System Modification

 

Program/Extended

SMS

Stores Management System

SMTP

Spooling Communications

 

System

SNA

Systems Network

 

Architecture

SNI

SNA Network Interconnect

SP

System Product

588VSE to OS/390 Migration Workbook

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IBM OS/390 Printer Formatting Aid, Processing Program Table, Processor Resource/Systems, PRogrammable OPerator, Read/Only
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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.
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