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I suspect that the gold layer on edge connectors 30-odd years ago was
a lot thicker than on modern cards. We are talking contacts on 0.1"
spacing not some modern 1/10 of a knat's whisker. (Off topic) I also
remember seeing engineers determine which memory chip was at fault and
replacing the chip using a soldering iron. Try that on a DIMM!
On 19/01/16 00:39, Peter wrote:
> On 19/01/16 12:34, J Martin Rushton wrote:
>> Not new: I can remember seeing DEC engineers cleaning up the
>> contacts on memory boards for a VAX 11/782 with a pencil eraser
>> c.1985. It's still a pretty standard first fix to reseat a card
>> or connector.
>
> I used to do that as well. The contacts would come out nice and
> shiny when you clean them. Then I found out that what I was
> actually doing was removing the very thin layer of gold plating on
> the contacts and revealing the copper underneath. That's why you
> should never clean contacts with a pencil eraser, just re-seat the
> boards and they'll make contact again.
>
>
> Peter _______________________________________________ CentOS
> mailing list CentOS@xxxxxxxxxx
> https://lists.centos.org/mailman/listinfo/centos
>
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