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

[Ron Natalie]

The 45 also has split I/D.    The 11/ 70 is designed that if you can put 
a kernel that is cognizant only of the lower numbers in the line, it 
will still work.


------ Original Message ------
>From "Kenneth Goodwin" <kennethgoodwin56 at gmail.com>
To "Folkert van Heusden" <folkert at vanheusden.com>
Cc "The Eunuchs Hysterical Society" <tuhs at tuhs.org>
Date 4/7/2025 8:02:01 AM
Subject [TUHS] Re: running BSD 2.11 on my PDP 11/70 emulator

>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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