[TUHS] running BSD 2.11 on my PDP 11/70 emulator

[Kenneth Goodwin]

To me it looks like a memory issue of some sort. Setup of the MMU etc.

1. Your user memory is less than 10% of "available memory" which should be
the amount left after the kernel loads and allocates dynamic  buffers. User
memory should be alot closer to available number. Unless it is referring to
limits of mmu per process and not total available for all user level
programs.

2. The bulk of the text dump seems to just be random initialized data
dumped from Ram.
Aka - Printf() format strings.  Indicates that the wrong address in memory
is potentially being accessed.

Perhaps the pdp11 emulator configuration does not have a correct mmu for
your image file.

For example,  you are running the 11/70 emulation and the binary image you
are running is actually compiled for a pdp 11/45.

The 11/70 has an mmu supporting split instruction and data spaces. 64k
instruction,  64k data. But the kernel you are using was compiled to run on
a non split I And D version of the pdp11 supporting only 64kb of combined
user and data.

On Mon, Apr 7, 2025, 3:30 AM Folkert van Heusden <folkert at vanheusden.com>
wrote:

> Hi,
>
> For fun I'm developing a PDP 11/70 emulator. It runs on everything from
> ESP32 microcontrollers up to linux, windows, etc
> https://vanheusden.com/emulation/PDP-11/kek/
> Currently it can run UNIX 7 in multi user mode.
> Of course I would like it to run BSD 2.11 as well (because of the
> networking support). It boots, but after outputting the memory amounts
> it produces a lot of garbage. It does eventually complete booting and
> then allows you to log in.
> I wonder if you sees this:
> https://paste.nurd.space/mqIDB_0SjoDoJoasOGkiNQ_NjpRsCufAJCnKTA7ZxUI
> (text) or
>
> https://imgpaste.nurd.space/pics/437bcf0d149a017168cbbf2def8560917a037a3935c5c3aa1fbea2f7e43b485a.png
> (image), does this ring a bell to anyone? I verified with simh that the
> disk-image should work.
>
>
> regards
>
> --
> www.vanheusden.com
>
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