[Info-vax] date comparison format from a program

[gérard Calliet]

Le 21/05/2019 à 04:15, Dave Froble a écrit :
> On 5/20/2019 6:44 PM, Hans Bachner wrote:
>> gérard Calliet schrieb am 20.05.2019 um 18:44:
>>> [...]
>>> Yes, but they are totally isolated platforms, and everything (software
>>> and hardware) on it has been certified at the time of the development.
>>>
>>> They have now to garanty a maintenance in operational condition. Reverse
>>> engineering on VAX CPU board, validation of parts are the major work.
>>> [...]
>>
>> Do they want to build spare CPU boards?
>>
>> Actually, reverse engineering of various VAX main boards has already
>> been done, but the result is software... check out CHARON-VAX, whether
>> it fulfills your certification requirements.
>>
>> At least, the software passed the original DEC hardware diagnostic
>> routines.
>>
>> Hope this helps,
>> Hans.
> 
> I think the key word here is "certification".
> 
> Someone has certified particular HW, running a particular version of 
> VMS, and some application(s).
> 
It's exactly the case.
> Doesn't do any good to mention out of date OS, old HW, VAX C, emulators, 
> security, and just about anything else.
Right, anything new is impossible.
> 
> Building VAX CPU boards is really way out there.  But, if it's the job, 
> then it's the job.
They tried that in the beginnings (1990s), thinking just replacing parts 
in CPU boards could help sometime... And it was not worth it: these CPU 
boards don't bug for decades.
>