DEC ST506 Interface Adapter Part No 54-17003-01

Ethan Dicks ethan.dicks at
Thu May 14 12:39:59 CDT 2009

On Thu, May 14, 2009 at 1:24 PM, Robert Jarratt
<robert.jarratt at> wrote:
> Looks like it is for a VAXstation 2000. Knowing that, does anyone know if
> such a thing could fit (and work) in one of the two machines I mention
> above?

I have a couple of uVAX 2000s (same box, move a jumper and don't
attach a tube).  The unexpanded box has connectors on the motherboard
and comes with cables to attach one drive.  I've seen them usually
with RD53s and RD54s, but RD31s and RD32s should work fine, or IIRC,
any drive you can manage to format on an RQDX3 using the Field Service
formatter (not the Customer Runnable Diagnostics formatter).  You can
format known models of drive (RD31, RD32, RD53, RD54, and perhaps
others) in the uVAX2000 box, too, but I don't think there's a way to
format non-DEC-geometry drives there.

So... unexpanded, you get a 20-pin and a 34-pin cable from the
mainboard to the drive.  What this expansion *might* be is a
replacement cable that extends past the drive and goes out an access
plate on the bottom of the box, then to a connector on a "skirt" (that
should also be included) to give you a (ISTR) DD50P that you can cable
to an external drive.  There may also be a small circuit board in the
skirt for the drive, it's been years since I've opened mine.

There's also room in the skirt for external connector for the 8-port
serial expander (DHT32?).  I have one of those too, but haven't gotten
the external cabling to use it.

So... there _is_ a kit for adding an external disk connector to a
MicroVAX/VAXstation 2000, but I have no idea if this part number is
what it is.  The *controller* is built into every uV/VS2000, but not
the cabling for an external drive.


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