DEC network card?

[Johnny Billquist]

On Thu, 25 Aug 2005 several wrote:

> From: Al Kossow <aek at bitsavers.org>
>
>  > Does anyone recognize this card?
>
> probably MIL-1553B (1mbit network used in aircraft)

Good point. It could definitely be 1553B.

> Any vendor? Huntsville Microsystems made interfaces.
> Try googling for "1553B unibus"


> From: Sridhar Ayengar <ploopster at gmail.com>
> Joe R. wrote:
> > Does anyone recognize this card?
> > <http://www.classiccmp.org/hp/Stuff%20Found%20at%20Rogers/network%20card.jpg
> >
> >>I found it in a PDP-11/44 but I couldn't find a model number or
> >
> > manufacturer's name on it. The other end of the four red cables connect to
> > four BNC connectors on the back of the cabinet and are marked Network
> > Ports. see
> > <http://www.classiccmp.org/hp/Stuff%20Found%20at%20Rogers/back3.jpg>
>
> Looks like a CI, no?  But I didn't know that you could put a Unibus CI
> in a PDP-11.  I thought those were for just the VAX-11's.

Actually, there never was a Unibus CI. The CI controllers on old VAXen was
never on Unibus, but on SBI. The 11/750 had a whole separate cabinet for
the CI750, which I think hung off the CMI (or what the bus on the 750 was
called).

> From: Paul Koning <pkoning at equallogic.com>
> Subject: Re: DEC network card?
> To: cctalk at classiccmp.org
> Message-ID: <17165.65022.802145.195486 at gargle.gargle.HOWL>
> Content-Type: text/plain; charset=us-ascii
>
> >>>>> "Simon" == Simon Fryer <fryers at gmail.com> writes:
>
>  Simon> On Thu, 25 Aug 2005 12:16:22, Joe R. <rigdonj at cfl.rr.com>
>  Simon> wrote:
>  >> Does anyone recognize this card?
>  >> <http://www.classiccmp.org/hp/Stuff%20Found%20at%20Rogers/network%20card.jpg
>
>  Simon> Cabling looks like SDI.
>
> Agreed.

Slightly, but I wouldn't draw that conclusion too far. :-)

>  >> > I found it in a PDP-11/44 but I couldn't find a model number or
>  >> manufacturer's name on it. The other end of the four red cables
>  >> connect to four BNC connectors on the back of the cabinet and are
>  >> marked Network Ports. see
>  >> <http://www.classiccmp.org/hp/Stuff%20Found%20at%20Rogers/back3.jpg>
>
>  Simon> The BNC connectors are a bit novel if it is SDI.
>
> If they were TNC (threaded not bayonet) I'd suspect it to be a CI
> interface card (from an HSC50 or the like).

Ummm. No dice. No HSC ever used Unibus, and since this a Unibus machine...
Also, the connectors are very oddly marked if it were CI.

> It doesn't look like a DEC board (unless the digital logo is on the
> other side).  The cable attachment for those coax cables doesn't have
> a DEC look to it, either.  And the picture of the back has a mil-spec
> look to it.  I wonder if this is a military databus interface.

That would go well with the previous guess of MIL-1553B, which I think is
probably the right guess.

	Johnny

Johnny Billquist                  || "I'm on a bus
                                  ||  on a psychedelic trip
email: bqt at update.uu.se           ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol