From: Ron Natalie <ron@ronnatalie.com>
To: Rudi Blom <rudi.j.blom@gmail.com>
Cc: tuhs <tuhs@minnie.tuhs.org>
Subject: Re: [TUHS] Any oldtimers remember anything about the KS11 on the 11/20?
Date: Sun, 23 Jun 2019 08:16:47 -0400 [thread overview]
Message-ID: <38B5393D-5316-484F-B499-2931E8C0C035@ronnatalie.com> (raw)
In-Reply-To: <CAMYpm87WDShNVfhGMnJEAFMoO8xnioaF+TqROpsYjrV55eDMyQ@mail.gmail.com>
We always referred to CSS as the DEC kludge department.
Sent from my iPhone
> On Jun 22, 2019, at 22:37, Rudi Blom <rudi.j.blom@gmail.com> wrote:
>
> Probably already known, but to be sure
>
> Interesting options: MX11 - Memory Extension Option: this enabled the
> usage of 128 KW memory (18-bit addressing range); KS11: this option
> provided hardware memory protection, which the plain /20 lacked. Both
> options were developed by the Digital CSS (Computer Special Systems).
> http://hampage.hu/pdp-11/1120.html
>
> PS the page listed below has a very nice picture of the 'two fathers
> of UNIX" working on a PDP-11/20
> http://hampage.hu/unix/unix1.html
next prev parent reply other threads:[~2019-06-23 12:21 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-23 2:37 Rudi Blom
2019-06-23 12:16 ` Ron Natalie [this message]
2019-06-23 22:01 Noel Chiappa
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