SBC6120 (a build-it-yourself PDP-8 clone) Last Buy and End ofLife

Don Y dgy at DakotaCom.Net
Mon Jun 5 16:20:30 CDT 2006

dave06a at wrote:
>>> Anyway, reseating chips isn't that difficult of a "fix" anyway...
>> Well it beats replacing unsocketed chips any day. Swap-in/swap-out vs.
>> cut pins off/desolder/clean holes/install new chip/clean more
>> holes/install/solder/resolder the pad you missed....
> IMHO, and essential tool if you are serious about doing any kind of
> rework is a good desoldering station. Takes a bit of time, but if done
> it right, the chip just lifts out with no damage to it or the board. One
> of the best investments to my workbench that I ever made....

This only seems to work on "nominal" boards -- 4 layers or
less, respectable annular rings, appropriate thermal reliefs,

Get a board with fine line rules and lots of thermal mass
on a pin (e.g., an internal power plane that is not
relieved) and you'll stand a good chance of lifting pads,

This actually can work to your advantage if you are
designing products and don't want folks dicking with them!


More information about the cctalk mailing list