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From: Warner Losh <imp@bsdimp.com>
To: Dave Horsfall <dave@horsfall.org>
Cc: Computer Old Farts Followers <coff@tuhs.org>
Subject: [COFF] Re: Supervisor mode on ye olde PDP-11
Date: Wed, 19 Jun 2024 01:48:54 -0600	[thread overview]
Message-ID: <CANCZdfr4x5NFo2Gu05jsUmKOqNfBz=rptj5GZYj--YfWVgXq7g@mail.gmail.com> (raw)
In-Reply-To: <alpine.BSF.2.21.9999.2406191642500.19266@aneurin.horsfall.org>

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On Wed, Jun 19, 2024, 1:37 AM Dave Horsfall <dave@horsfall.org> wrote:

> Sort of between kernel and user mode, Unix [zillion trademarks etc] never
> used it. but did RSX-11?
>

2.11BSD used a mode between kernel and user for the TCP stack to get more
effective address space...

Warner

I used the latter long enough to hate it until Edition 5 arrived at UNSW,
> and I still remember being blown away by the fact that there was nothing
> privileged about the Shell :-)
>
> -- Dave
>

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  reply	other threads:[~2024-06-19  7:49 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-06-19  6:49 [COFF] " Dave Horsfall
2024-06-19  7:48 ` Warner Losh [this message]
2024-06-19 11:11 ` [COFF] " Milo Velimirović

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