|Re: 48G memory expansion -- key is how you open the calculator.|
Message #5 Posted by Paul Brogger on 7 Nov 2003, 11:50 a.m.,
in response to message #1 by spencer
I've done a couple. 128K is easy.
256K is doable, but the lazy way I did it (trying to solder-bridge the upper memory chip pins to those on the lower chip) didn't last long at all. If you do 256K, find some way to firmly connect the second memory chip's pins to those of the first.
I've heard of three methods of opening the calculator:
1. taking off the keyboard overlay to get at the tops of some internal "heat stakes" (plastic posts with melted, mushroomed ends that hold the front & back of the calculator together);
2. cutting the heat stakes from behind the IR lens and from within the battery compartment; and
3. somehow (?) just prying the thing apart.
I don't trust the first to leave the keyboard face fully intact, and can't believe the third leaves no marks on the case. (There are probably people who will dispute these assumptions.) The only one I've tried is the second, and there are several web sites with descriptions of how to do it. It does require that holes be cut into the back case, but in places that are usually hidden, so I think it is the best alternative.