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There are millions of millions of x86 computers and free software to run on them from any era. That should suffice for a collapsian civilization. Unless it's full on Mad Max post apocalyptic we're talking about.

Including Unix System 7, its been ported.

Though I suspect your right, PC DOS is very powerful, and allows you to do a bunch of stuff.

You're probably talking about Unix version 7: https://en.wikipedia.org/wiki/Version_7_Unix

You really want to go back 40 years to the dumb terminal era?

If I'm running it on a 16-bit system, yes. I can built a teletype in a capable machinist shop.

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