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Tales from Mainframe Modernization
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At my last workplace, I wrote transpilers (or just compilers if you prefer) from mainframe languages (COBOL, JCL, BASIC etc.) In the roughly 200k lines of COBOL that I had the (dis)pleasure of working with, I saw some wonderful hacks to get around the limitations of the system. The DD statement in the JCL subsystem stands for “data definition”, which is largely used to describe files and IO streams used by a batch job.
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