Re: help replacing Ram Chips on an Apple //e

[Rubywand <rubywand@swbell.net>]

Supertimer writes ...
> 
> "Candace Richardson" <puguaman@yahoo.com> wrote:
> 
> >I have an Apple //e that was diagnosed as having Bad ram on the
> >motherboard. I got replacements for it, but how do I change the chips? do
> >they just pop out? It's hard getting them out, and I am tempted to use some
> >pliers but I don't want to damage anything. Some UN-soldering perhaps?
> >Please help. Thanks
> 
> They are soldered in...
>

     Bad news!


> One trick to repair the IIe without knowing how to solder is to piggyback
> the new chip on the bad one. ....
> 
> I once fixed a IIe with 2 bad RAM chips this way and it worked for six
> years before something else broke...

     Kind of neat! However, there are a few possible problems with this
approach. One is that Candace can not be sure that her bad mem IC's
failed as politely as yours. For instance, suppose a bad chip is locked
into outputting O on a Data line. A piggy-backed IC would be battling
the bad IC when it wanted to output a 1.

     Then, too, we do not know which, if any, mem IC's are bad.
Piggybacking eight 16-pin IC's is a fair piece of work. It is not that
much more trouble to de-solder the IC's, use solder wick to open up the
holes, and install 16-pin sockets.


 
Rubywand