alt Hacker NewsTurtles all the way down and up: Vehicle makers sourcing plug-compatible devices which emulate floppy drives for updating tank s/w, Airlines sourcing print and terminals emulating IBM mainframe era dependencies for gate check processes.
Talking of mainframes, many core bank registry functions are emulations of prior systems long embedded into architectures now themselves superseded. Support for tech archaisms has long roots.
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There's also like one company still manufacturing CRTs, and their market is exclusively military and heavy-industrial, replacements for old fighter-jet HUDs and the like:
https://www.thomaselectronics.com/avionics/head-up-display/
I'm sure there's at least one wealthy Smash Bros. enthusiast willing to pay their asking price and hook up one of their HUDs to a Gamecube to play Melee though.
IBM mainframes were for a very long time built and sold on the premise of providing reliable emulation of previous generations weren't they.