unibus backplane list?
Dwight K. Elvey
dwight.elvey at amd.com
Mon Aug 15 16:31:35 CDT 2005
>From: "Joe R." <rigdonj at cfl.rr.com>
>At 03:51 PM 8/12/05 -0600, you wrote:
>>On 8/12/05, Brad Parker <brad at heeltoe.com> wrote:
>>> Is there a list of the various pdp-11 unibus backplanes anywhere?
>>I do not know of a master list online.
>>> My 11/44 has a DD11-DF in it which is impossible to get cards into and
>>> out of. It's like something is physcally wrong with it. Rather than
>>> damage any cards I thought I'd replace it.
>>It takes a bit of force to get hex cards in a nearly-unused backplane.
>> I've bent latches trying to get boards in.
> I've had similar trouble with the HP 1000 boards. I found that if I
>clean the edge connectors and them wipe them with a rag slightly dampened
>with WD-40 (mostly kerosene, a light oil) that the cards go in and out much
>easier and I have a lot less intermitant contacts. I believe the oil
>coating also helps reduce oxidation of the contacts.
From what I've been told, WD-40 contains both silicon and
petrolium oils. I prefer using silicon grease for this purpose.
Past experiments with petrolium oil and grease showed that the
contact resistance increased on clean contacts while the
silicon grease showed a significant drop in resistance.
I recommend Dow-Cornings, DC-4.
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