Re: ZipGSx Upgrade Problem??

[Wayne Stewart <waynes@intergate.bc.ca>]

Marvin Miller wrote:

> Hi RubyWand;
>
> The sockets are in the proper location. The card actually has some
> silkscreening to show where the sockets should be and this works with
> either .3 or .6. Also, in your faq it mentioned just cutting out
> sections and putting in sections. Extrapolating on these  two sources
> - they're in the right place.
>
> As for oscillator, it's the stock one for 7 MHz proc speed. I didn't
> want to change anything else at the start, and the card does work, but
> only with the DIP set for 32k cache. I checked the soldering on the
> back of the second bank of chips (obviously first bank works as it
> runs at the original 32k) and they all look 100% As I mentioned, the
> job went great and I was very confident of the work (I have zip for
> soldering skills but it looks good :-)
>
> Is it right to have 4 of the same SRAM's, or did I need to buy two of
> one type and two of another? All I did was get 4 identical SRAM's with
> two being a slower rating. Correct?
>
> Also, is the order correct? This is from left to right as viewed head
> on
> ;
> TAG 15ns DATA 20ns TAG 15ns DATA 20ns

Those should work fine in that order,

>
>
> If that's all correct, I'd have to say I have either;
>
> - A bad chip

I take it you've made sure none of the legs are beny up and all are in the holes
You could try the non working SRAM in the sockets you know are functioning

>
> - Bad soldering

Even if the back of the card looks good, one of the traces on the other side might
have lifted in removing the origional sockets. The traces are more delicate than usual
on the ZipGS.

On the good side 64k offers only a very small speed difference over 32k and a
number of people have mentioned having to go to 32k for stability at higher speeds.

    Wayne