I have a morbid curiosity about this system, but I don't really have a charitable view of it.

The story as far as I know, goes like this

Back in the late 1970s Dave Cutler and his team create VMS at DEC as the next generation operating system for DEC's new flagship product, the VAX minicomputer.

VMS is good by all accounts and was a successful product, but Unix goes on to dominate the minicomputer and emerging server market for the next decade.

Then in the 1990s DEC goes out of business and sells VMS to Compaq, but not before porting it to their doomed Alpha CPU architecture.

Then in 2000s Compaq goes out of business and gets acquired by HP, and together they port VMS to the doomed Itanium CPU architecture.

In 2014, a shop called VMS Software Inc (VSI) strikes some kind of deal with HP where they get to develop and support new versions of VMS while older versions continue to belong to HP. As part of this, they finally announce an x86-64 port. This port first sees the light of day in 2020.

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The story is essentially bad bet after bad bet, missing the boat and fighting the last war over and over again. And today, it's just a piece of legacy software being used to extract the last bits of value from the organizations that are stuck with it.

Even so, I hope for a true open source release of it one day.

David Cutler is one of my heroes. I think he only worked on the first version of VMS, but his expertise of OS design and implementation is probably second to few.

Does anyone know whether he is still working in Microsoft? What does it feel to work with him?

Wow this is what put food on the table for us as a kid. Respect to VAX / VMS. I wonder if anyone remembers sperry univac digital burrows etc tech co of yore. It gave me a childhood in America, so however old or obsolete it may be I have a fond place for it.

Is there any reason to use VMS today other than for existing applications that cannot be migrated? I've heard its reliability is legendary, but I've never tried it myself. The 1 year licensed VM seems excessively annoying. Is it just old and esoteric, or does it still have practical use? At least with Linux, multiple vendors release and support distros and it is mainstream, whereas with VMS, you'd be stuck with VSI.

Does it seem right that ACPI alone is almost 9% of the LOC in this code base? At over 165K lines?

Mind, I honestly don't know anything about the details of ACPI.

But, seems like a lot to me.