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A comment on The Problem of Legacy IT Systems. Parent comment

Re:The Problem of Legacy IT Systems by bluGill on Tuesday October 13, 2020 @12:39PM (#24767214)
10 year old code would be considered very new where I work. I know for a fact code I wrote 10 years ago is still the heart of our system (with very few changes). I know of code that someone else wrote 30 years ago that is still in use, getting that code tested is very important so we can confidently make changes for the next product that will use it.

A few years back we started an effort to rewrite some old C code into a modern system with formal proofs of correctness. That was given up because the new improved process turned out to be 3x more expensive to write new code vs new code in the old process. (formal proofs were the reason to use the new process, but not the reason it was 3x more expensive. I'm not allowed to comment beyond this so don't ask...)

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Re:The Problem of Legacy IT Systems by kjs3 on Tuesday October 13, 2020 @03:40PM (#24769436)
If you book an airline ticket, odds are under the hood you're hitting an IBM TPF application (prolly PARS/IPARS). When I was involved in that world 20 some-odd years ago the programmers would regularly show me files with 'last modified' in the 80's and 90's. These aren't things that someone casually modifies, and I would expect you'd find an awful lot of the same even now.
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