From: cross@spitfire.i.gajendra.net   
      
   In article <10dmk89$bj46$1@dont-email.me>,   
   Arne Vajhøj   wrote:   
   >On 10/26/2025 9:56 PM, bill wrote:   
   >> On 10/26/2025 10:55 AM, Arne Vajhøj wrote:   
   >>> On 10/26/2025 8:35 AM, bill wrote:   
   >>>> On 10/26/2025 6:42 AM, Johnny Billquist wrote:   
   >>>>> On 2025-10-25 03:35, bill wrote:   
   >>>>>> On 10/24/2025 1:34 PM, Arne Vajhøj wrote:   
   >>>>>>> And it seems like a case where support does matter.   
   >>>>>>   
   >>>>>> The last mention of the PDP-11 in this kind of work was looking   
   >>>>>> for people with MACRO-11 experience.  It would not surprise me   
   >>>>>> to find out that no commercial OS is involved (possible no OS at   
   >>>>>> all, just running an application on bare metal),  A VAX in the   
   >>>>>> same environment could do the same.   
   >>>>>   
   >>>>> You need some PDP-11 OS running in order to use Macro-11. And unless   
   >>>>> I remember wrong, at least Ontario Hydroelectric was/is running RSX.   
   >>>>   
   >>>> To do the development maybe.  But one can create programs in Macro-11   
   >>>> that run all by themselves on bare iron.  Fig Forth?   
   >>>   
   >>> Like VAXELN?   
   >>   
   >> I doubt VAXELN will run MACRO-11 or that it will run on a PDP-11.   
   >   
   >Of course not.   
   >   
   >But it sounds like the same deployment model.   
   >   
   >My understanding about VAXELN (based on what I have been told - no   
   >personal experience) is that you link the OS into the application   
   >and deploy the application (with embedded OS) directly on   
   >the VAX.   
      
   VAXELN is closer to VxWorks than to what Bill described.  You   
   do development on a computer running a general purpose OS, and   
   link against their libraries and so on to generate an image you   
   load onto the target machine, but the environment provides a   
   small executive to handle task switching, event management, and   
   so forth.   
      
   I interpreted what Bill wrote as more like treating a PDP-11 as   
   a glorified microcontroller: perhaps there's a very small boot   
   loader in firmware, but after that, you're on your own; any   
   support for multiple tasks that your application has is   
   something that you provided; more generally, whatever   
   abstractions you use are ones you provided yourself.  You're   
   writing your own interrupt handlers, and so.   
      
   	- Dan C.   
      
   --- SoupGate-Win32 v1.05   
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