[Info-vax] clock problems with OpenVMS x86 on VirtualBox

[Fred. Zwarts]

Op 13.mei.2023 om 02:18 schreef Arne Vajhøj:
> On 5/12/2023 8:41 AM, bill wrote:
>> On 5/12/2023 8:14 AM, Simon Clubley wrote:
>>> On 2023-05-12, Jan-Erik Söderholm <jan-erik.soderholm at telia.com> wrote:
>>>> Actually, that was how I thought it worked. Since I observed that
>>>> the clock in my VirtualBox VMS environment lagge a bit behind
>>>> but each 10-20 sec, it jumpt ahead and skipped a second so that
>>>> it become in sync with the host Windows environment again.
>>>
>>> That's going to make for some "interesting" real-time program 
>>> behaviour... :-)
>>
>> Does VMS still claim to be an RTOS?  Did it ever (there was VAXELN)?
> 
> I don't think it ever has.
> 
> But 30 years ago most believed that VMS had better
> real time characteristics than Unix.
> 
> Arne
> 

In 1980 the RT properties of VMS were part of the decision to by a VAX 
for our nuclear physics laboratory, i.e. the special scheduling of 'Real 
Time' priority processes.
I don't know if those properties are still present.