On Thu, 26 Aug 2010 21:24:53 -0400, "Michael A. Terrell"
wrote:


"DoN. Nichols" wrote:

On 2010-08-26, wrote:
On Thu, 26 Aug 2010 06:04:53 -0700, Larry Jaques
wrote:

[ ... ]

Oxidized connections at the connectors account for a very large
percentage of computer repairs, too. R&R connector, computer starts
working.


Used to be REAL common with socketed DIP RAM and DIP socketed
processors. Remember when virtual;ly every chip on a motherboard was
plugged into a socket????

That was when memory chips cost a significant fraction of the
cost of the board on which they were installed and it was beneficial to
be able to replace an individual (bad) chip.

And the common repair used to be to lift the computer (no hard
disk installed) a few inches off the table, hold it parallel to the
table and drop it to re-seat the chips. :-)


Or to remove the chip, shove a goos machined pin IC socket into the
cheaper formed pin tyoe, then inset the chip into the new socket?
Some of our high end boards back in about 1986 had all machined pin
sockets on them. About double or triple the cost for a bare board than
with the spring pin sockets. All gold plated machined pins, too.