8 Aug
2012
8 Aug
'12
6:49 p.m.
Hi all --
Anyone know anything about the DEC SB-11 enclosure? It's a small
(13"x12"x3.5" or so) chassis containing a power supply and a 4-slot
dual-height q-bus backplane. Very cute, and I want to put together a
small 11/23 system in it. Anyone know the original intended usage for
these little things?
In particular, a power supply schematic would be helpful as the one in
mine is giving me trouble at the moment. (Just blows fuses when powered
up.) I can't find anything useful about it on the 'net. The full model
designation on this one is "OSB11-EA."
Thanks as always,
Josh
8 Aug
8 Aug
7:19 p.m.
On 8/8/2012 6:49 PM, Josh Dersch wrote:
Hi all --
Anyone know anything about the DEC SB-11 enclosure? It's a small
(13"x12"x3.5" or so) chassis containing a power supply and a 4-slot
dual-height q-bus backplane. Very cute, and I want to put together a
small 11/23 system in it. Anyone know the original intended usage for
these little things?
In particular, a power supply schematic would be helpful as the one in
mine is giving me trouble at the moment. (Just blows fuses when
powered up.) I can't find anything useful about it on the 'net. The
full model designation on this one is "OSB11-EA."
Thanks as always,
Josh
Is it the same as this one ?
http://home.windstream.net/engdahl/pdp-11_23.htm
Might be everything you need to know there.
7:36 p.m.
On 8/8/2012 7:19 PM, mc68010 wrote:
On 8/8/2012 6:49 PM, Josh Dersch wrote:
No, that looks like something else entirely. However, I just now
noticed another ID on this device, on the rear below the Digital logo;
it appears the full name for this chassis is BA11-VA. And already I'm
finding a bit more useful information :).
Such as: http://www.pdp-11.nl/ba11-boxes/ba11va/ba11va-info.html. Mine
looks identical to that, except it says "SB11" in orange on the front
next to the Digital logo. Now to track down that schematic...
Josh
Hi all --
Anyone know anything about the DEC SB-11 enclosure? It's a small
(13"x12"x3.5" or so) chassis containing a power supply and a 4-slot
dual-height q-bus backplane. Very cute, and I want to put together a
small 11/23 system in it. Anyone know the original intended usage
for these little things?
In particular, a power supply schematic would be helpful as the one
in mine is giving me trouble at the moment. (Just blows fuses when
powered up.) I can't find anything useful about it on the 'net. The
full model designation on this one is "OSB11-EA."
Thanks as always,
Josh
Is it the same as this one ?
http://home.windstream.net/engdahl/pdp-11_23.htm
Might be everything you need to know there.
10:49 p.m.
Hi Josh,
It was rereferred to as the Shoe Box, and usually had a M7270, MXV11,
and an RX interface. I think they came with a 18 bit backplane, but
can be rewired for 22 bit. I have one around here somewhere. They also
made a matching box with a pair of TU58s.
Paul
On Wed, Aug 8, 2012 at 9:36 PM, Josh Dersch <derschjo at mail.msu.edu> wrote:
On 8/8/2012 7:19 PM, mc68010 wrote:
On 8/8/2012 6:49 PM, Josh Dersch wrote:
No, that looks like something else entirely. However, I just now noticed
another ID on this device, on the rear below the Digital logo; it appears
the full name for this chassis is BA11-VA. And already I'm finding a bit
more useful information :).
Such as: http://www.pdp-11.nl/ba11-boxes/ba11va/ba11va-info.html. Mine looks
identical to that, except it says "SB11" in orange on the front next to the
Digital logo. Now to track down that schematic...
Josh
Hi all --
Anyone know anything about the DEC SB-11 enclosure? It's a small
(13"x12"x3.5" or so) chassis containing a power supply and a 4-slot
dual-height q-bus backplane. Very cute, and I want to put together a small
11/23 system in it. Anyone know the original intended usage for these
little things?
In particular, a power supply schematic would be helpful as the one in
mine is giving me trouble at the moment. (Just blows fuses when powered
up.) I can't find anything useful about it on the 'net. The full model
designation on this one is "OSB11-EA."
Thanks as always,
Josh
Is it the same as this one ?
http://home.windstream.net/engdahl/pdp-11_23.htm
Might be everything you need to know there.
11:43 p.m.
Yes SB or shoe box 11.
Sold by DEC Components Group to OEM's as an enclosure for 11/23 board sets.
Unusual in that it was black and silver as opposed to the normal DEC beige
Regards
?
Rod Smallwood
?
-----Original Message-----
From: cctech-bounces at classiccmp.org [mailto:cctech-bounces at classiccmp.org]
On Behalf Of Josh Dersch
Sent: 09 August 2012 02:50
To: General Discussion: On-Topic and Off-Topic Posts
Subject: DEC SB11 info
Hi all --
Anyone know anything about the DEC SB-11 enclosure? It's a small
(13"x12"x3.5" or so) chassis containing a power supply and a 4-slot
dual-height q-bus backplane. Very cute, and I want to put together a
small 11/23 system in it. Anyone know the original intended usage for
these little things?
In particular, a power supply schematic would be helpful as the one in
mine is giving me trouble at the moment. (Just blows fuses when powered
up.) I can't find anything useful about it on the 'net. The full model
designation on this one is "OSB11-EA."
Thanks as always,
Josh
9 Aug
9 Aug
2:55 p.m.
Hi all --
Anyone know anything about the DEC SB-11 enclosure? It's a small
(13"x12"x3.5" or so) chassis containing a power supply and a 4-slot
dual-height q-bus backplane. Very cute, and I want to put together a
small 11/23 system in it. Anyone know the original intended usage for
these little things?
This sounds very like a BA11-V box. Have you tried finding information on
that to see if it matches?
-tony
8:17 p.m.
On 8/9/2012 2:55 PM, Tony Duell wrote:
Yes, that's what it turned out to be (a BA11-VA). And after I
discovered I was using the wrong fuses (thought I had grabbed a 3A, but
it was a 2A) it stopped blowing them on powerup :). I now have a very
minimal 11/23 system running in it.
Thanks,
Josh
Hi all --
Anyone know anything about the DEC SB-11 enclosure? It's a small
(13"x12"x3.5" or so) chassis containing a power supply and a 4-slot
dual-height q-bus backplane. Very cute, and I want to put together a
small 11/23 system in it. Anyone know the original intended usage for
these little things?
This sounds very like a BA11-V box. Have you tried finding
information on
that to see if it matches?
-tony
10 Aug
10 Aug
4:02 a.m.
On 08/09/2012 11:17 PM, Josh Dersch wrote:
On 8/9/2012 2:55 PM, Tony Duell wrote:
Yes, that's what it turned out to be (a BA11-VA). And after I
discovered I was using the wrong fuses (thought I had grabbed a 3A,
but it was a 2A) it stopped blowing them on powerup :). I now have a
very minimal 11/23 system running in it.
Thanks,
Josh
I three of them one with 11/2, and pair of MXV11 and storage is TU58,
the second with 11/23 with 256K ram, DLVJ11, MRV11,TU58 storage,
the third has 11/23 with 256K ram, DLVJ11, RQDX3 (and RD52 in second
backplane less BA11VA box).
Compact but useful systems in 4 cards.
Allison
Hi all
--
Anyone know anything about the DEC SB-11 enclosure? It's a small
(13"x12"x3.5" or so) chassis containing a power supply and a 4-slot
dual-height q-bus backplane. Very cute, and I want to put together a
small 11/23 system in it. Anyone know the original intended usage for
these little things?
This sounds very like a BA11-V box. Have you tried finding
information on
that to see if it matches?
11:55 a.m.
Yes, that's what it turned out to be (a BA11-VA).
And after I
discovered I was using the wrong fuses (thought I had grabbed a 3A, but
it was a 2A) it stopped blowing them on powerup :). I now have a very
Ah.... :-)
I once had a considerably more evil problem. I had an SMPSU (actually
part of a small monitor) that blew the mains fuse sfotly at power-on. By
'softly', I mean it jsut failed, it didn't 'flash' or shatter. I
removed
the chopper transitor, the fuses continuied to blow,. so I thought the
fualt was i nthe bridge rectifier or smooting capcitors. Everything
checked out.
And then by chance I found it. You see, I ran out of fuses, so I went and
bought soem more. Fitted one of those, it held. Cacpaitors charged fine.
Refitted the chopper transisotr, it still ehld and the entire montiro
worked fine.
These wew 1A (IIC) anti-surge fuses. It turned out that the ones I'd just
bougth were a differnet brand ot the oens I had been using. The inrush
current must have been a bit high (perghaps the limiter thermsitor was
marginal or soemthing). One make of fuse would blow at that current, the
oterh didn;.
As I said, evil...
-tony
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days inactive
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