On 1/19/2016 3:29 PM, J Martin Rushton wrote: > 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! indeed, I pretty much quit doing component level electronics when everything went to surface mount. -- john r pierce, recycling bits in santa cruz