Everything you always wanted to know about mainframes...
summary
Mainframes still process things like credit card and train payments, claim is 800 billion lines of COBOL (vendor number), and they mix ancient constraints (EBCDIC, punch‑card column formats, record‑based files) with modern tech (Java on z/OS, Tomcat rarely used). Runtime is JCL jobs, COBOL with picture clauses/redefines, assembler and abends for precise crash codes. Migration options are binary emulation or recompilation; one vendor offers software-defined mainframes to run mainframe binaries on Linux. Costs run into hundreds of millions and talent is scarce.
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chapters (8)
- 0:00Why talk about mainframes
- 4:48Mainframe vs Java vocabulary
- 12:00Cobol programming basics
- 21:26Cobol statements and features
- 30:25Working with mainframes daily
- 37:40Should we keep mainframes
- 44:16Modernizing mainframe code
- 51:33Q&A
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