From: Clem Cole <clemc@ccc.com>
To: Phil Budne <phil@ultimate.com>
Cc: TUHS main list <tuhs@minnie.tuhs.org>
Subject: Re: [TUHS] Unix for PDP11/20 w/o mmu or paging option
Date: Fri, 17 Sep 2021 15:43:38 -0400 [thread overview]
Message-ID: <CAC20D2POQzOr4=9O6Js=yc_CN+bR1=8qV6yBtTN+kbcizta50w@mail.gmail.com> (raw)
In-Reply-To: <202109171828.18HISiR5057486@ultimate.com>
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On Fri, Sep 17, 2021 at 2:51 PM Phil Budne <phil@ultimate.com> wrote:
> The earliest Unix running on the 11/20 requires not only the custom MMU,
> but also a fixed-head disk
Right, a 4Mbyte RF11/RS11 which Ken refers to as /dev/drum in this code.
That lived for a pretty long time - at least thru the Sixth edition, IIRC.
> (the genesis of the tiny root partition?),
I thought the original system just swapped to it, no mounted FS on it, but
unless someone knows for sure, it means staring at Ken's assembler listings
for V1 that Warner mentioned earlier.
> 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
>
ᐧ
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next prev parent reply other threads:[~2021-09-17 19:44 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-17 15:35 Noel Chiappa
2021-09-17 18:28 ` Phil Budne
2021-09-17 19:43 ` Clem Cole [this message]
2021-09-17 19:51 ` Brantley Coile
2021-09-17 20:07 ` Clem Cole
2021-09-17 21:21 ` Phil Budne
-- strict thread matches above, loose matches on Subject: below --
2021-09-17 20:18 Noel Chiappa
2021-09-17 20:47 ` Clem Cole
[not found] <2007825471.713023.1631887763341.ref@mail.yahoo.com>
2021-09-17 14:09 ` Roland via TUHS
2021-09-17 14:33 ` Warner Losh
2021-09-17 15:32 ` Clem Cole
2021-09-17 16:04 ` Roland via TUHS
2021-09-17 16:14 ` Clem Cole
2021-09-17 16:44 ` Roland via TUHS
2021-09-17 16:13 ` Warner Losh
2021-09-17 16:17 ` Clem Cole
2021-09-17 16:05 ` Roland via TUHS
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