So I previously:
http://www.classiccmp.org/pipermail/cctech/2015-June/006953.html
wrote:
>> I see 'three' different kinds of 'UNIBUS to cables' cards listed:
>> M9014 UNIBUS to 3 H854s
>> M9015 3 H854s to UNIBUS
>> M9031 UNIBUS to 3 3M cables for 11/74
>>
> On Jun 26, 2015, at 3:58 PM, John Wallace wrote:
>
> [huge snippage for brevity, apologies for rubbish formatting]
>
> I'm not 100% sure I'm right in what follows (it's been a long time) but
> improvements are welcome. It builds on much of what has already been said.
>
> Termination has bee
[huge snippage for brevity, apologies for rubbish formatting]
I'm not 100% sure I'm right in what follows (it's been a long time) but
improvements are welcome. It builds on much of what has already been said.
Termination has been covered by various contributors - termination reduces (but
may no
[BC11A cable]
> You're right, the alternates are grounded (ohmmeter shows it). I cannot see
> how they did it; I think there must be a comb-shaped trace along the top of
> the card, where it's hidden once the Flexprint cable is soldered down. The
> intermediate ground conductor on one trace, on on
> From: tony duell
>> So every other wire on the 40-conductor flat cables should be ground -
>> that's even better than the classic BC11A, where almost every other
>> line is, from what I can see, simply left floating (which is better
>> than nothing, but not as good as groundi
> On Jun 25, 2015, at 2:01 PM, Noel Chiappa wrote:
>
>> From: Paul Koning
>
>>> Right, but the very similar QBUS does have terminations (of a sort -
>>> the rules for when you need terminations on QBUS extensions are so
>>> complex that I don't really grok them yet) 'in the middle'
>
>> That d
> From: Paul Koning
>> Right, but the very similar QBUS does have terminations (of a sort -
>> the rules for when you need terminations on QBUS extensions are so
>> complex that I don't really grok them yet) 'in the middle'
> That doesn't seem likely. ... the definition of 'te
[M9014]
[One row on each Berg is ground]
> Ah, hadn't noticed that! But then again, I hadn't looked at them closely
> yet! :-) Yes, they do connect to ground - all the UNIBUS ground pins are
> ganged together, and connected to the A-row Berg pins on all 3 connectors.
I am not at all surprised th
> On Jun 25, 2015, at 1:02 PM, Noel Chiappa wrote:
>
>> From: tony duell
>
> ...
>>> I was wondering if maybe the M9015 was an M9014 with termination
>>> resistors, or something (the way the QBUS versions come with and with
>>> termination)
>
>> I would be very surprised. Unibus is normally te
> From: tony duell
> There are 3 40 pin Berg headers, one row of each appears to be ground
Ah, hadn't noticed that! But then again, I hadn't looked at them closely
yet! :-) Yes, they do connect to ground - all the UNIBUS ground pins are
ganged together, and connected to the A-row Berg pin
>> If it's any help I pulled an M9014 out of the Unibus Out slot of my
> > 11/730. There's currently an M9302 in there.
>
> Very interesting! Thanks for the data. This seems to indicate that the M9014
> could function as either end of the cable.
Somewhere I have the expansion box that wen
> From: Alan Perry
> FYI, in my 750, the UNIBUS expansion has a L0010 in the main cabinet
> and a M9014 in the expansion cabinet.
> From: tony duell
> If it's any help I pulled an M9014 out of the Unibus Out slot of my
> 11/730. There's currently an M9302 in there.
Very
> So I'm trying to look into this (BC11 cables being unobtainium these days, at
> least at prices which are less their weight in gold).
Are they really that rare? I've got a small box of them here.
> I assume the M9014/M9015 are a pair, one used at the start of the cable, and
> one at the end?
The 3 bergs to unibus was used in the RK8-E, the unibus end plugging into
the first physical drive.
Between unibus backplanes were always M920, M9202, bus margin jumpers,
which i can't remember the part numbers, and various Albe and other non-dec
options. The cable was always a BC11A-XX, i think 2
On Mon, Jun 22, 2015 at 11:46:08AM -0400, Noel Chiappa wrote:
>> I've seen M9014s only at the far end of the UBAs on a KS10, so it
>> wasn't taking the place of a BC11.
>
>??? If it wasn't take the place of a BC11 (i.e. proving a path for the UNIBUS
>out), what was it doing?
OK then I gues
On 6/22/15 8:51 AM, Alan Perry wrote:
On another topic, we had discussed me going through my B1000 stuff and Burroughs contacts to assist the buyer of that system that you facilitated. Unfortunately, all that I have come up with are
dead ends. I found additional material, but is all pretty mu
FYI, in my 750, the UNIBUS expansion has a L0010 in the main cabinet and
a M9014 in the expansion cabinet. I didn't note the details of the
cable(s) between the two when I did the inventory of my system.
On another topic, we had discussed me going through my B1000 stuff and
Burroughs contacts
> From: John Wilson
> I've seen M9014s only at the far end of the UBAs on a KS10, so it
> wasn't taking the place of a BC11.
??? If it wasn't take the place of a BC11 (i.e. proving a path for the UNIBUS
out), what was it doing?
> it'd certainly be easy to make replacements for th
On Mon, Jun 22, 2015 at 11:09:38AM -0400, Noel Chiappa wrote:
>I assume the M9014/M9015 are a pair, one used at the start of the cable, and
>one at the end?
Interesting. I can't think of a reason why the two ends would need to be
different, but otherwise why do both exist? I've seen M9014s only
19 matches
Mail list logo
