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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@centos.org https://lists.centos.org/mailman/listinfo/centos