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German railway seeks IT admin to manage MS-DOS and Windows 3.11 systems
(www.techspot.com)
This is a most excellent place for technology news and articles.
And miss some tricky edge cases, which were covered in old code?
It's a railroad. Those edge cases could be disastrous.
Ok, keep it for the next 100 years and get custom build hardware which can run that stuff, that's cheap and safe.
Never touch anything
No. What I mean is rewriting it part by part, not from scratch, but following the old algorithms as possible.