[RndTbl] SCSI cable length

[Hartmut W Sager]

Oh, I also forgot to ask:  Which museum relinquished this device?  :)

Hartmut W Sager - Tel +1-204-339-8331, +1-204-515-1701, +1-204-515-1700


On 3 July 2015 at 19:48, Hartmut W Sager <hwsager at marityme.net> wrote:

> > I'm a big SCSI guy, but ...
>
> I too am an old SCSI fan, but my interest started to wane when so many
> SCSI signalling standards and connectors began to proliferate together with
> SCSI moving totally into the high-end server realm and away from "ordinary"
> peripherals.  Oh, and then there was that "termination power" headache
> (usually selected/deselected by jumpers).
>
> > The device has a standard dense 50-pin 2-row connector.  I thought at
> first that meant for sure LVD, but now I'm thinking it just means ultra.
>
> It doesn't even mean "ultra", let alone HVD/LVD.  That connector became
> the norm during the single-ended classic SCSI 2 generation - to my great
> chagrin, since the Centronics 50-pin connector was so much better.
>
> > Is there a way to know what signalling this device uses based just on
> the connector?
>
> No, but:
>
> > I checked all available interent specs, incl the original manual, for
> the device and *nothing* specifies anything other than "SCSI".
>
> Since the original manual (lucky you to have that!) doesn't specify
> anything other than "SCSI", it is a near certainty that this isn't LVD or
> HVD, but simply good old single-ended classic SCSI (of at least SCSI 2
> generation).  It probably isn't "ultra" either, especially if it's a
> scanner or CD drive or similar slow device rather than a hard drive.
>
> Hartmut W Sager - Tel +1-204-339-8331, +1-204-515-1701, +1-204-515-1700
>
>
> On 3 July 2015 at 16:06, Trevor Cordes <trevor at tecnopolis.ca> wrote:
>
>> I have an external SCSI device that I'd like to plug in on a 10-15' cable.
>> The device has a standard dense 50-pin 2-row connector.  I thought at
>> first that meant for sure LVD, but now I'm thinking it just means ultra.
>> I need LVD to get over 1.5M cable length, according to spec.  LVD lets me
>> go to 12M it appears.  If it's just ultra then I'm SOL, I guess.
>>
>> Is there a way to know what signalling this device uses based just on the
>> connector?  I checked all available interent specs, incl the original
>> manual, for the device and *nothing* specifies anything other than "SCSI".
>>
>> I'm a big SCSI guy, but my memory on the subject is starting to get
>> hazy due to disuse...
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>
>
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