Another ZipGSX Mod Success!

[Steven Hirsch <snhirsch@gmail.com>]

I took the plunge and modified my ZipGSX to 64k cache and 12.5Mhz. CPU clock. 
 Polymorph's howto was extremely helpful with respect to locating the parts. 
In particular, I did not realize that WDC would sell small quantities directly 
to individuals!

Instead of cutting the sockets, I tool the plunge and used my aging OK 
Industries desoldering station to remove the originals outright.  Went very 
smoothly.  The Zip PC board seems to have fairly heavy cladding and robust 
plate-through on the vias.  Managed to do the job without (God forbid) tearing 
any traces or lifting pads.  My 55-year-old eyes are not up to this task 
without a good magnifier between them and the PCB :-).

When first fired up, it crashed repeatedly.  After some shameful language, I 
calmed down and went through the cards one-by-one, reseating chips and taking 
a pencil eraser to the edge connectors.  That seems to have taken care of 
things, and it's now been running for about 20 minutes without problems.

I'll keep my fingers crossed, but so far, so good!

Steve