From: "Milo Velimirović" <milovelimirovic@gmail.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 06:11:20 -0500 [thread overview]
Message-ID: <DC0BA2CB-2EED-4086-831A-C5BC63739130@gmail.com> (raw)
In-Reply-To: <alpine.BSF.2.21.9999.2406191642500.19266@aneurin.horsfall.org>
> On Jun 19, 2024, at 1:49 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?
I don’t know about RSX-11.
Back to UNIX: Supervisor mode probably never ran any code, but its memory management registers were used in m45.s in functions copyseg and clearseg.
—Milo
prev parent reply other threads:[~2024-06-19 11:11 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 ` [COFF] " Warner Losh
2024-06-19 11:11 ` Milo Velimirović [this message]
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