Re: ZipGS/TWGS upgrade FAQ

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

On 23 Nov 1996 pubpc17@library.ucla.edu wrote:

> 
> I've managed to make use of skinny SRAMs without directly soldering
> the Zip at all.  What I did was to take a .3 mil wide (wire-wrap type)
> DIP socket and bent the leads sideways.  I then soldered these leads
> to the contacts on a .6 mil wide DIP component carrier.  The result is
> a .3 mil to .6 mil adapter.  I had the skinny SRAM installed on the
> adapter and the adapter installed on the Zip.
> 
> No heat was ever applied to the Zip or the SRAM chips.
> 
> The adapters look sort of like this:
> 
>          _________ 
>         |-|o| |o|-|
>         |-|o| |o|-|
>         |-|o| |o|-|
>         |-|o| |o|-|
>         |-|o| |o|-|
>         |-|o| |o|-|
>         |-|o| |o|-|
>         |-|o| |o|-|
>         |-|o| |o|-|
>         |-|o| |o|-|
>         |-|o| |o|-|
>         |-|o| |o|-|
>         |-|o| |o|-|
>         |-|o| |o|-|
>          ---------
> 
>            |___|_________ .3 mil socket soldered onto a
> 
>          |_______|_______ .6 mil DIP component carrier
> 
> 
> If you want to, you can add this method to your FAQ.
> 

Digi-Key has sold .6-to-.3 adapters for some time. The problem
with these has always been that they introduced too much 'noise'
to the system and the SRAMS would not work. Supposedly, they
may work with special 'low power' or 'double low power' SRAMS.
However, I don't know of anyone who ended up using these
adapters successfully. I still have my set in a drawer :-)

However, your wire wrap version may be of different construction
and thus avoid these pitsfalls.

Paul.

pschultz@med.wayne.edu
Paul Schultz