SBC6120 (a build-it-yourself PDP-8 clone) Last Buy and End ofLife
dgy at DakotaCom.Net
Mon Jun 5 14:12:31 CDT 2006
Roger Merchberger wrote:
> Rumor has it that Jim Beacon may have mentioned these words:
>> I'll also cite early double sided
>> boards, before through-hole plating - it is virtually impossible to
>> both sides of a socket.
> Virtually impossible? I doubt that - however, there's a few caveats...
> Why not get wire-wrap sockets that have longer tails, and put a
> toothpick or popsicle stick under the socket when you solder it (with
> enough room to remove it later), then it will give enough room to solder
> the top as well, thereby bridging both layers. Sure, it's a little more
> labor, but can & does work... Granted, if you were working in a very
> limited height scenario, one might need to be careful with the extra
That also is problematic if the devices are located too close
*But*, you can buy individual *pins* and solder them as well.
E.g., consider how Augat panels are built...
>> Oh, and anything you want to be reliable......
>> Remember all those "I reseated the chips in their sockets and it worked"
>> posts you've seen on this list!
> Use machine-turned or machine-pin sockets. Don't blame the socket for
> all the companies (CouATARIgh ;-) that used cheap sockets... Besides,
> cheap sockets are still better than no sockets when you need to repair
> or replace a ROM type chip (CouTANDYgh ;-) but I won't mention any
> names. ;^>
> Anyway, reseating chips isn't that difficult of a "fix" anyway...
Often, oxidation and corrosion (on a microscopic level)
are the culprit. I've many older components with
"tarnished" pins (legs). Even *soldering* to them is
a chore unless you remove the cruft.
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