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There are companies that specialize in this area such as Microfocus and Fujitsu.
A long time ago, I wrote a Tandem COBOL to C# and WPF translator (https://github.com/GartzenDeHaes/cobol2cs). The key bits are:
- COBOL UI's run in a customer written environment that provides navigation and session data. In the system that I wrote, there's a WPF application that provides these services.
- Convert SCREEN COBOL to C#. The Tandem uses a VT6530 that is similar to an extended IBM 3270. There are client-side protected fields and scrollable areas that need to be emulated in WPF.
- Convert COBOL servers to C#. The Tandem has a 3-tier architecture where the screen programs talk to services running in a middle tier through an network layer called PATHWAY. These can be converted to classes and be created on demand in C#.
- Remote access to SQL/MP databases. Tandem has a Java Servlet environment that can be used as a data access layer. The transpiler generates these Servlets and the C# data access layer.
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