It is our observation that, as RSX-11M and RSX-11D continue to diverge, more and more users are finding it necessary to run both systems for similar ranges of applications. This situation can impose an unacceptable cost in software development and maintenance. Compati¬bility in utilities, system files, system features, and code at source and object level offers a realistic first step to reduce this burden.nThis report presents a discussion of the incompati¬bilities uncovered in converting a large volume of soft¬ware from one operating system to the other, as well as the techniques developed to circumvent these problems. Code conversion and long-term software maintenance are discussed with respect to specific system incompatibili¬ties. Finally, management and software engineering tools are discussed as they apply to the conversion and main¬tenance effort.
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