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You should take a look at my company. Heirloom Computing. Heirloom.cc We have migrated many mainframe application and millions of lines of cobol and pl1 into Java and deployed it into production on prem and into the cloud.

But is the conversion maintainable by a human? I’ve seen Fortran to C translators that end up encoding state transition machines that are impossible to read.

How did that go? My employer is going to try snd evaluate watsonx product. Have you had any luck converting large/complex COBOL modules ?

Don’t know about COBOL, but we recently threw some ancient RPG 3 programs into ChatGPT for conversion to both ‘plain English’ and PHP and it got pretty close - maybe 80-90%.