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    I used to work for a company running a COBOL mainframe on a Tandem system, which was upgraded from a variety of older computing systems, and contains code to emulate the behavior of a Burroughs Mechanical Calculator so that certain tabulating processes can continue to work.

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      If MOCAS is the oldest program, then the compiler they use must be younger. Have different compilers been used over the years, as the hardware changed?

      A potential spring chicken, relatively, in the oldest compiler stakes: http://shape-of-code.coding-guidelines.com/2012/08/31/the-oldest-compiler-still-in-production-use-is/

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        Around 1990 while I was in college a friend of mine and I met with a guy that ran a very small credit union in town that was looking to replace the IBM mechanical accounting machine they were still using to keep records (something like this - but it looked a little more modern like it was built in the 1960s). We ended up not working together with him but it was neat to see that machine in action.