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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.
A remote KVM through a portal would be the actual way an air gapped system would be accessed, yeah... Spoofing ps/2 or Din with a teensy would probably be needed to use new hardware for the KVM. Maybe a SFF PC with an analog input capture card...