[TUHS] quick question on PDP-11 addressing

[Arnold Robbins via TUHS]

Jonathan Gray via TUHS <tuhs at tuhs.org> wrote:

> On Mon, May 04, 2026 at 02:19:59AM -0400, Phil Budne via TUHS wrote:
> > I wrote:
> > > CB (Columbus Bell) Unix, and SVR1 ran on 11's and supported shared
> > > memory segments.
> > 
> > The sysv_pdp11.tgz I just found has has a library shmsys.c which
> > indicates SHMSYS was syscall 52, but it's a "nosys" entry in sysent.c
> > AND I've yet to spot the kernel support in the available CB Unix
> > listings...
>
> You may be looking for MAUS?
>
> https://www.tuhs.org/Archive/Distributions/USDL/CB_Unix/man/man2/maus.2.pdf
>
> maus.c cbunix4.pdf pp 64-66
> sysent.c cbunix6.pdf pp 50-52
>
> 	1, &maus,			/* 58 = set up MAUS segment reg */

The UNIX 4.0 release notes that Matt sent out a little while ago
mentions that on the PDP-11 MAUS is supported instead of the
shared memory sys calls.  FWIW.

Arnold