From mboxrd@z Thu Jan 1 00:00:00 1970 MIME-Version: 1.0 References: <1539086308.3134428.1535702480.6E438630@webmail.messagingengine.com> <1539167918.1698058.1536955600.44157FDA@webmail.messagingengine.com> <7aa20b2c724f78c2@orthanc.ca> In-Reply-To: <7aa20b2c724f78c2@orthanc.ca> From: "Digby R.S. Tarvin" Date: Fri, 12 Oct 2018 07:55:38 +1100 Message-ID: To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net> Content-Type: multipart/alternative; boundary="0000000000006e54ab0577fa3081" Subject: Re: [9fans] PDP11 (Was: Re: what heavy negativity!) Topicbox-Message-UUID: ed0f2fba-ead9-11e9-9d60-3106f5b1d025 --0000000000006e54ab0577fa3081 Content-Type: text/plain; charset="UTF-8" Oh yes, I read Eldon Halls book on that quite a few years ago. Meetings held to discuss competing potential uses for a word of memory that had become free. That one would be a challenging Plan9 port.. On Fri, 12 Oct 2018 at 05:13, Lyndon Nerenberg wrote: > Digby R.S. Tarvin writes: > > > Agreed, but the PDP11/70 was not constrained to 64KB memory either. > > > I do recall the MS-DOS small/large/medium etc models that used the > > segmentation in various ways to mitigate the limitations of being a 16 > bit > > computer. Similar techniques were possible on the PDP11, for example > > Coincidental to this conversation, I'm currently reading "The Apollo > Guidance Computer: Architecture and Operation" by _Framk O'Brien_. > (ISBN 978-1-4419-0876-6) Very interesting to see what you can do with > a 15 bit architecture when sufficiently motivated. > > --lyndon > > --0000000000006e54ab0577fa3081 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Oh yes, I read Eldon Halls book on that quite a few years = ago. Meetings held to discuss competing potential uses for a word of memory= that had become free.

That one would be a challenging P= lan9 port..

On F= ri, 12 Oct 2018 at 05:13, Lyndon Nerenberg <lyndon@orthanc.ca> wrote:
Digby R.S. Tarvin writes:

> Agreed, but the PDP11/70 was not constrained to 64KB memory either.
> I do recall the MS-DOS small/large/medium etc models that used the
> segmentation in various ways to mitigate the limitations of being a 16= bit
> computer. Similar techniques were possible on the PDP11, for example
Coincidental to this conversation, I'm currently reading "The Apol= lo
Guidance Computer: Architecture and Operation" by _Framk O'Brien_.=
(ISBN 978-1-4419-0876-6)=C2=A0 Very interesting to see what you can do with=
a 15 bit architecture when sufficiently motivated.

--lyndon

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