High Level ASM Conversion

Our High Level ASM Conversion solution provides a turnkey modernization of your assembler assets to Java or C#, and your associated mainframe databases to relational models deployed to the Cloud or on premises. These modern Cloud-enabled applications and databases are functionally equivalent to their legacy counterparts, eliminating the hassle and expense of ASM and the mainframe. This reduces cost, allows for deeper integration, and enables customization to meet business requirements.

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Discussing the 2022 Mainframe Modernization Report

60 minutes

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Why modernize?


Scarcity of domain expertise

Developers who understand ASM and other mainframe languages are reaching retirement age and no one is being trained to replace them, resulting in a steadily diminishing talent pool. As this shortage grows, the costs and risk of relying on ASM will continue to rise.

Limited flexibility

Companies are rapidly moving to modern environments and practices such as DevOps and the Cloud. ASM and the underlying systems that support it were not designed for modern IT, resulting in difficult integrations and limited flexibility.


Exorbitant costs

Mainframes cost as much as 4,500 per cent more to operate than equivalent Cloud counterparts. This figure is compounded by rising licensing and maintenance fees for ancillary mainframe applications and databases. 

Automated ASM Refactoring


Our Automated ASM Refactoring solution preserves the benefits of legacy systems while empowering organizations to leverage the advantages of newer platforms, especially the Cloud. This unlocks a whole new world of quality and scalability from automated testing to quality assurance, and the ability to leverage containerized deployments and orchestration with Docker and Kubernetes.

There are several characteristics of ASM that are unlike those of other languages which are impactful enough to require special consideration. For example, since ASM is byte-oriented, it is common to come across bit-level instructions and pointers that do not have equivalents in other languages. The combination of system specificity, instruction intent obscured by byte-orientation, and a general lack of expertise available in the marketplace, render proper handling and modernization of ASM code incredibly difficult. By employing the unique combination of time-tested software and hardened ASM expertise that we offer, it is possible to reduce the high risk associated with migration and successful modernization of environments containing ASM.

To account for the unique challenges assembler presents, our Automated Refactoring process follows two passes. During the first pass, all source ASM programs and macros (except for user-generated macros) are processed directly.

In the second pass, complex user macros and code included in the areas of concentration identified during assess and design are handled with special care. ASM listings are processed, producing an intermediate source program, within which all system and simple macros are retained in their original, compressed format. Complex user macros and select components are expressed in expanded format, as developed by the IBM HLASM compiler. If necessary, each macro and special case is converted individually using case-specific settings within our proprietary software to ensure code quality.

Once the ASM programs and related databases are refactored, Java and C# developers can extend application functionality for Cloud optimization using standard DevOps tools and CI/CD concepts that simply aren’t available for mainframe applications. Precious business logic from the legacy system is preserved, while levels of optimization can be applied to deliver efficiencies and business benefits such as elasticity, granular service definition, and easy integration with Cloud-native services.

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Over 35 years of ASM and mainframe modernization experience

More than 500 successful modernization projects completed

Over 2.5 billion lines of code refactored through automation

Intelligent modernization, unparalleled experience


Additional resources to help you modernize



Modernization: No assembly required

This whitepaper answers common questions faced by organizations looking to ditch mainframe assembler, and outlines our own solutions.

Read whitepaper





Fiserv: Modernizing the Galaxy platform

Learn how Fiserv reduced the risk of failure, eliminated vendor lock-in and lowered operating costs through modernizing their custom platform.

Read case study





2022 Mainframe Modernization Report

Exploring the impact of the new era of digitalization and change on the current state of legacy systems and organizations' modernization plans.

Read report



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Dec 02, 2022 by Tim Jones, Managing Director of Application Modernization, Advanced

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Oct 21, 2022 by Tim Jones, Managing Director of Application Modernization, Advanced

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May 24, 2021 by Rob Anderson, Vice President of Marketing and Product, Advanced

News & Opinions

BLOG // 06-06-2023

Industry Insights: Mainframe Migration and Cloud Adoption in Healthcare

by Tim Jones, Managing Director - Application Modernization

Industry Insights: Mainframe Migration and Cloud Adoption in Healthcare

The Future of OpenVMS: Risks and Opportunities

The OpenVMS operating system has been the driving force behind numerous mission-critical business applications worldwide for decades. Although OpenVMS…

by Tim Jones, Managing Director - Application Modernization

BLOG // 15-05-2023
The Future of OpenVMS: Risks and Opportunities