I think this one is only for Dan, or anyone seeking to make quite big pin-money by maintaining 50 years old software.
IBM have just released the Cobol/CICS compiler environment for Linux PCs.
https://www.theregister.com/2021/04/07/ibm_cobol_x86_linux/
Unfortunately although Cobol itself is quite simple to learn, many of the programs written in Cobol pushed the boundaries of hardware and software, and as a result maintenance can be an exercise in decoding how people used to interpret the various fields on the 80 column punched cards used to feed in both the program and data.
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