[Simh] VAX/VMS

[Johnny Billquist]

On 2016-02-16 14:33, Paul Koning wrote:
>
>> On Feb 16, 2016, at 6:49 AM, Johnny Billquist <bqt at softjar.se> wrote:
>>
>> On 2016-02-16 07:57, Wilm Boerhout wrote:
>>> Zane Healy schreef op 15-2-2016 om 18:20:
>>>
>>> [snip]
>>>
>>>> There are plenty of good VAX and VMS manuals out there, including the
>>>> documentation set.  Check eBay and abebooks.com.
>>>>
>>>> The last version of VMS that will run on a VAX is v7.3.
>>>>
>>>> Zane
>>> More precisely, V7.3 will run on *any* VAX, including the primal
>>> VAX-11/780. This level of backwards compatibility is unique.
>>
>> No, it is not. Talk to IBM about S/360... :-)
>
> Nor is it unique at DEC.  Consider RT-11.  And possibly RSX-11/M (I don't know that one well enough -- does it run on an 11/20?)

Yes, unmapped RSX-11M would run on an 11/20. So you could claim that 
RSX-11M is runnable on almost any PDP-11 ever made. Of course, you would 
not be able to do program development on all of those platforms, but you 
could deploy an application.

But RSX-11M in some ways feels and behaves rather different if you have 
an MMU or not. So it would not give the same uniform feeling like VMS or 
RT-11 would.

	Johnny