[TUHS] Can PDP-11/23 PLUS run Unix?

[ROBERT MYERS via TUHS]

Can Mini-Uniz run on a 11/23 Plus?  I know it runs on a 11/40.

> On Feb 26, 2026, at 5:19 PM, segaloco via TUHS <tuhs at tuhs.org> wrote:
> 
> On Thursday, February 26th, 2026 at 15:06, Madeline Autumn-Rose via TUHS <tuhs at tuhs.org> wrote:
> 
>> v7m is also an option
>> Sent from my iPhone
>> 
>>> On Feb 26, 2026, at 15:03, Clem Cole via TUHS <tuhs at tuhs.org> wrote:
>>> 
>>> https://gunkies.org/wiki/PDP-11/23#:~:text=hampage.hu,are%20no%20problems%20with%20this.
>>> 
>>> 
>>> To your questions. Because it lacks separate I/D
>>> Space and does not support supervisor mode (only user and kernel) 2.11BSD
>>> will not work.  However V6 and V7 are possible. I think Ultrix-11 should be
>>> able to work and is more likely to have the low level details that 11/23
>>> will need.
>>> 
>>> 
>>> Sent from a handheld expect more typos than usual
>>> 
>>> 
>>>> On Thu, Feb 26, 2026 at 5:52 PM ROBERT MYERS via TUHS <tuhs at tuhs.org> wrote:
>>>> 
>>>> I’ve just obtained a 11/23 Plus system off of EBay and plan to get a QBone
>>>> to emulate memory along with a few other things.  I need to know if
>>>> Floating Point support is a requirement as well if I can also emulate up to
>>>> 4 Mb of memory.  I’m interested in v6/v7/BSD2.11 for Unix variants.
>>>> Sent from my iPhone
>>>> 
>> 
>> 
> 
> Here is a salient document:
> 
> https://www.tuhs.org/Archive/Documentation/Manuals/Unix_4.0/Volume_2/F.5.3_UNIX_on_the_PDP_11_34.pdf
> 
> Therein Ted Kowalski describes the process of moving UNIX from the
> PDP-11/70 to the PDP-11/34, with mentions of the PDP-11/23 also being a
> beneficiary of the porting efforts.  If there's not an out-of-the-box
> solution already, this paper may be useful in re-porting V6, as would be
> referring to Mini-UNIX and LSX, both of which are in the UNIX tree.
> 
> - Matt G.