[HECnet] Simplest PDP-11

[Brian Hechinger]

What about the different CPUs?

On Sun, Feb 3, 2019, 17:11 Johnny Billquist <bqt at softjar.se wrote:

> On 2019-02-03 22:42, Brian Hechinger wrote:
> > On Sun, Feb 3, 2019, 16:15 Johnny Billquist <bqt at softjar.se
> > <mailto: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.
>
> If the size of the device driver is anything to go on, then roughly
> ranked from easiest:
> RK11
> TC11
> RP11
> RL11
>
> Massbus in general I think can be done to work without too much
> complexity. RK611 shouldn't be too bad, but do add a bit more stuff.
>
> But I think pretty much anything except MSCP is roughly similar in
> complexity for someone implementing it.
>
>    Johnny
>
> >
> >      > 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
>
>
> --
> Johnny Billquist                  || "I'm on a bus
>                                    ||  on a psychedelic trip
> email: bqt at softjar.se             ||  Reading murder books
> pdp is alive!                     ||  tryin' to stay hip" - B. Idol
>
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