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this post was submitted on 30 Jan 2024
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In some cases, it usually boils down to specialized hardware and software. The software might make an obscure call to a function that only exists in only one specific version of hardware, as an example. (In some cases, the original company who made the machine or the original developers may not even exist any more.)
I would imagine that at least for manufacturing, it's more efficient to use original parts. From a factory owner perspective, it's better to use a part that is proven to work instead of a hack. A thousand dollars for a floppy drive is pocket change when an hour of downtime costs several thousand dollars. In those cases an engineer should err on the side of reliability.
I don't want to pretend that I know the details of mass production, because I don't. I am just repeating things I have heard over the years.
Edit: Just replace the machine! Well, there are cases where that can't happen. A similar example that I know of relates to major components of Navy ships. If a large engine component needs to get changed, they have to cut massive holes through each deck of the ship just so they can lift out and replace that component. It's a hell of a process. Similar situations could occur in large factories where machines are hundreds of thousands of tons and buried deep in the bowels of an old factory.