[HECnet] Simplest PDP-11

[Frank Wortner]

If you want to see what will actually run on somewhat limited hardware,
then Paul Nankervis's PDP11/45 emulator
<https://skn.noip.me/pdp11/pdp11-45.html>has a nice collection of operating
systems running on a 256K system.  2.9 BSD boots and runs from an simulated
RL02.  (2.11 BSD needs an 11/70 or better.)  This should at least show what
is possible.


On Sun, Feb 3, 2019 at 4:44 PM Brian Hechinger <wonko at 4amlunch.net> wrote:

> On Sun, Feb 3, 2019, 16:15 Johnny Billquist <bqt at softjar.se wrote:
>
>> On 2019-02-03 22:02, Brian Hechinger wrote:
>> > What is the simplest PDP-11 CPU/peripheral design that is capable of
>> > running RSX-11, RSTS/E or BSD?
>>
>> Define "simple" please. :-)
>>
>
> The easiest to implement with limited tools.
>
> > Also, what is the minimum disk space needed to install those operating
>> > systems? I have a plan. Probably not a good one but I'll likely learn a
>> > lot in the the process so it won't be a waste of time.
>>
>> RSX-11M-PLUS can run from two RL02, if you just accept the pregen
>> system. But that's the smallest. If you want to build stuff, something
>> like an RK07 is required, and that is 28 Megs. But I think it's
>> recommended that you have two. But that probably is for more reasons
>> than just running the actual system (it is hard to do an update if you
>> are running on an RK07, and the update media is an RK07).
>>
>> RSX-11M definitely gets away with less. RSTS/E would be similar, I
>> think, while BSD probably wants a little more.
>
>
> Ok, that's what I needed to know (more ballpark than anything else is fine)
>
> Thanks!!
>
> -brian
>


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