[Simh] Which PDP-11 to choose

[Johnny Billquist]

If we talk about running actual hardware, then you can run SCSI on 
Unibus systems as well. And if we're talking simulation, you can pretty 
much run any disk size you want, if you go with MSCP.

Pretty much all SCSI controllers for PDP-11s appeared as MSCP 
controllers anyway.

   Johnny

On 2019-07-01 03:29, Clem cole wrote:
> Btw.  The biggest advantage of the later model qbus systems is some larger but cheaper scsi options  that dec released later in life but none of that has ever mattered to me in practice when running simh.  You can use RH70 (massbus controllers) and just use the larger (originally expensive) 19” disks from the early days.
> 
> Sent from my PDP-7 Running UNIX V0 expect things to be almost but not quite.
> 
>> On Jun 30, 2019, at 8:52 PM, Will Senn <will.senn at gmail.com> wrote:
>>
>> All,
>>
>> Is there any particular reason to choose one model of PDP-11 over another in the sim? I am a user who is usually only interested in using one of the various programming languages available on the dec oses - I frequently use RT-11 for BASIC or ASSEMBLY and Unix V6 and V7 for C and for fun, as well as an occasional foray into RSTS-E and lately RSX 11-M Plus to try and find the perfect OS for as many programming languages as I can get in one place. In my language/os explorations, I generally just grab somebody's example ini file or take a default machine 11/40 or 11/94, but it's been pretty will-nilly on my part. I'd like to have some kind of rationale related to necessity, but it doesn't really seem to make much difference. I know the 11/45 had split I/D, making it 'better' than the 11/40 and that the unibus is different than the q-bus and I'm sure the hardware support is different between the models, but I haven't really been prevented from running anything that is runnable... but of course, if I was prevented, I just chalked it up to who knows why that didn't work, so I might never know if I'm missing out on the El Dorado of ancient OSes. Does anyone have some guidelines to help choose which model configuration is appropriate for various needs? Or, in this day and age of endless supplies of ram and memory, should I just load it up to the biggest, baddest, pdp-11 of all time and leave it at that (and if so, which one is that?).
>>
>> Thanks for the assist.
>>
>> Regards,
>>
>> Will
>>
>> -- 
>> GPG Fingerprint: 68F4 B3BD 1730 555A 4462  7D45 3EAA 5B6D A982 BAAF
>>
>> _______________________________________________
>> Simh mailing list
>> Simh at trailing-edge.com
>> http://mailman.trailing-edge.com/mailman/listinfo/simh
> _______________________________________________
> Simh mailing list
> Simh at trailing-edge.com
> http://mailman.trailing-edge.com/mailman/listinfo/simh
> 


-- 
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