[HECnet] Simplest PDP-11

[Ray Jewhurst]

I'd have to say that you would want at least an 11/45 but that won't run
211BSD and I'm not sure about Ultrix. I'd be willing to test it though.

On Sun, Feb 3, 2019, 6:15 PM Brian Hechinger <wonko at 4amlunch.net wrote:

> 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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