The following languages and compilers are supported for MQSeries applications:

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Assembler

￿Assembler H (5668-962)

￿IBM High level assembler MVS (5696-234)

COBOL

￿VS COBOL II (5668-958)

￿IBM COBOL for MVS & VM Release 2 (5688-197)

C

￿C/370 Release 2.1.0 (with APAR UN37741) (5688-187)

￿IBM SAA AD/Cycle C/370 (5688-216)

PL/I

￿OS PL/I Optimizing Compiler (5668-910)

￿SAA AD/Cycle PL/I Compiler (5688-235)

Java

￿OS/390 Java Development Kit 1.0.2 available at http://ncc.hursley.ibm.com/javainfo/download/index.html

9.5.1.2 Installation and Customization

The most important prerequisite for migrating from VSE/ESA is that you have set up a CICS/ESA and the COBOL compiler and runtime environment.

After you have verified that your OS/390 system fulfills the prerequisites you can install the MQSeries for MVS/ESA code. Follow the instructions in the MQSeries for MVS/ESA Program Directory. They include not only details of the installation process but also information about any necessary prerequisite products and their service or maintenance levels.

SMP/E, used for installation on the MVS/ESA platform, validates the service levels, prerequisite and corequisite products, and maintains the SMP/E history records to record the installation of MQSeries for MVS/ESA. It loads the MQSeries for MVS/ESA libraries and checks that the loads have been successful.

You now have to customize the product to your own requirements. Customization tasks include:

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define the MQSeries for MVS/ESA subsystem to MVS

authorize the MQSeries for MVS/ESA load libraries

include the MQSeries for MVS/ESA load library in the link list

include the MQSeries for MVS/ESA dump formatting member

update the MVS/ESA Program Properties Table (PPT)

create procedures for the MQSeries for MVS/ESA subsystem

tailor your security procedures

customize the initialization files

create the bootstrap and log data sets

define your page sets

tailor your logging environment

200VSE to OS/390 Migration Workbook

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IBM OS/390 manual Installation and Customization, Pl/I
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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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