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COBOL and mainframe modernisation, explained.
Practical, vendor-neutral guides to migrating COBOL safely: what breaks, how to test it, and how to choose an approach.
Guides4 parts
- 01How to test a COBOL migration
- 02COBOL to Java: what breaks
- 03Modernisation approaches
- 04Glossary
Guides
- How to test a COBOL migrationA practical guide to testing a COBOL or mainframe migration: capturing inputs, choosing comparison points, golden master, replay and parallel runs, boundary values, coverage and sign-off.
- COBOL to Java: the semantics that breakCOBOL to Java conversion pitfalls: packed decimal (COMP-3), PIC scaling and truncation, ROUNDED, REDEFINES, PERFORM THRU, GO TO, EBCDIC sort order and FILE STATUS, with how to test each.
- Mainframe modernisation approaches, comparedCompare mainframe modernisation (modernization) approaches: rehost, replatform, refactor, rewrite and AI-assisted migration, with the trade-offs of each and how to verify the result.
- GlossaryPlain-English definitions of the COBOL, mainframe and migration-testing terms used across these guides.
How Montora does it
- COBOL migrationMigrate COBOL to Java, Python or C# without losing behaviour. Montora translates one reviewed piece at a time, replays recorded legacy runs against the new code and puts every change in front of a person.
- Mainframe modernisationMainframe modernisation (modernization) for banks and insurers: move COBOL workloads to modern code in verified steps, with replay evidence and human sign-off at every change.
- Migration testingTest a COBOL or mainframe migration with evidence: replay recorded legacy runs against the new code, compare every field, and block the merge until differences are resolved.
- Business rule extractionExtract business rules from COBOL: plain-English rules drafted for every unit, linked to the code that implements them, and confirmed by your experts before migration.
See it on your own code.
Montora is taking on a small number of design partners: banks, insurers and other teams with COBOL they can't afford to get wrong.