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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