VaxStation 2000 PSU info needed

From: ajp166 <ajp166_at_bellatlantic.net>
Date: Mon Apr 16 18:21:01 2001

From: Richard Erlacher <edick_at_idcomm.com>
>> To start with the switcher in question is 1987 design maybe earlier.
>> The MV2000 was available in 87 or 88 if memory
>> serves. And even if I'm wrong it's very definitely pre1990.
>>
>AND there's no reason to believe that because it behaves as I described,
it's
>because of an obsolete design. It's quite likely that they didn't want
the
>supply kicking on unless there was a load. PC supplies were designed
that way
>... of course that was in 1980 ...


PC supplies would overvoltage and crowbar there was no intelligence in
their design or applied to it.

>From what I observed, the DEC rotatin memory subsystems were
>ALWAYS of old technology, i.e. used SMD after nobody else
>would ship SMD devices, and didn't start to use SCSI until forced
>to do so by market demand and not until long after third-party
>competitors had been beating them in the marketplace.


Whats wrong with SMD? It was better than SCSI-1, and SCSI-2.
 And there was no third party standard for SCSI at all until the late
80s.
Even then DEC had far faster technologies and regarded it for low
end slower systems.

>It was EMULEX, IIRC, that forced them out of the '70's with their
>disk drive subsystems. I wasn't aware that DEC ever built a disk
>drive. Their products seemed to me to be rebadged and


Then you arent aware. All the RA8x and 9x were DEC as were the
initial RZ2x series and a long list of others. They did off the shelf
stuff
too but then that was usually for the smaller packaged systems
or where time was a market driver.

>repackaged drives from other makers, only at 10x the current
>price. Those DEC labels were surely expensive.

Much of it markup but also a fair amount getting the vendor to fix
errors spotted by DEC, getting it to comply to spec and in many cases
getting it to pass FCC.

Allison
Received on Mon Apr 16 2001 - 18:21:01 BST

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