[Info-vax] Baremetal emulators, was: Re: Alpha emulator for OSX

[Jan-Erik Soderholm]

Den 2016-02-08 kl. 21:43, skrev Johnny Billquist:
> On 2016-02-08 18:52, Simon Clubley wrote:
>> On 2016-02-08, lists at openmailbox.org <lists at openmailbox.org> wrote:
>>>
>>> Very well said as usual. But is this an issue for OpenVMS users? Is OpenVMS
>>> used for real-time applications?
>>>
>>
>> Oh, yes, at least for soft real-time ones. (VMS isn't really suitable for
>> hard real-time as it doesn't have the required guarantees. No doubt
>> someone will be along shortly to claim they have successfully done it
>> anyway for specific problem areas. :-))
>>
>> As Johnny has pointed out, VMS has a level of soft real-time capability
>> which traditionally has not existed in the normal Unix world.
>
> I believe VMS was at least designed for also dealing with hard realtime,
> but maybe I'm wrong. Maybe that is why people should stay with RSX. ;-)
>
> If all you have is soft real time, then a Linux host OS will also do, since
> it is sufficient for soft realtime.
>
> It usually manage to hit the target, but you never know, and have to live
> with that it sometimes don't...
>
>      Johnny
>

Fun discussion, of course, but today you'd propably throw in a PLC.

Even the smallest PLCs has more processing power then PDPs or
smaller VAXes, *and* true hard RT capabilites. Then you VMS boxes
can talk to the PLCs and tell them what to do, or something...