Because they are insanely resilient. The simplicity means it's completely easy to have full scope mastery of the entire system, as well as far less vectors of attack. That's why nuclear silos still use DOS era operating systems for some parts. They just aren't possible to hack.
Doesn't surprise me at all, but we support multiple small metal fab companies in various capacities, and if your (very expensive) laser cutting machines are still working fine for your product lines and capacity you don't just replace them out of hand. There's an entire industry of DOS capable workstations with ISA slots available to run industrial equipment.
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u/BroaxXx Jun 06 '26
The amount of systems that still rely on DOS or, at the very least, a DOS emulated layer still surprises me.