Re: SIS Question

[Paul Schultz <pschultz@med.wayne.edu>]

On 20 Mar 1997 pubpc1@library.ucla.edu wrote:

> 
> 
> Digi-Key stocks 0.3mil to 0.6mil adapter sockets for about $7 each.
> The ones you want are part number A502-ND.  You can plug a 28 pin
> SRAM into the 0.3mil adapter socket and the adapter in turn plugs into
> the 0.6mil socket on the Zip.  Digi-Key web site http://www.digikey.com/
> (If you have some spare sockets lying around, you can build your
> own cheap, but that's another story.)
> 

A cautionary note here: "Scott G." is the only person I've read who claims
that the 0.6mil to 0.3 mil socket adapters will work with the SRAMS
on an accelerated ZipGS. I performed my upgrade years ago (when the 
65816-E was the only 'fast CPU offerred) and tried to use the adapters.
They didn't work for me. They didn't work for anyone else at the time.
_AND_ they didn't work for the people at Zip (or MCT or whatever they
are called now). The people at MCT said that the adapters MIGHT work
if you found "double low power" or "low power" SRAMS. Apparently, the
adapters create too much of an interference which causes the Zip to
freeze-up at the higher speeds. This problem is completely alleviated
by having someone who is competent with a soldering iron to install
new narrow sockets.

If you are going to attempt to run your ZipGS at 12-14 MHz, you will
need to optimize your chances of success by having your ZipGS
upgraded properly. Some Zips (even when upgraded properly) still can't
perform reliably at 12-14 MHz.....they never were intended to run at
this speed (and neither was your IIgs) so everything gets "finicky"
at the elevated speeds.

Paul

pschultz@med.wayne.edu
Paul Schultz