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.
>
>  Joe

Hi
 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.
Dwight





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