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From: Phil Budne <phil@ultimate.com>
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Subject: Re: [TUHS] Unix for PDP11/20 w/o mmu or paging option
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The earliest Unix running on the 11/20 requires not only the custom
MMU, but also a fixed-head disk (the genesis of the tiny root
partition?), so I agree with Noel that MINI-UNIX and LSX, while not
"historically correct" for your hardware are a good fit, and that
building a working system on simulated hardware would likely be the
easiest route.

Phil