Re: Zip GS Upgrading

["Sheldon Simms" <sheldonsimms@yahoo.com>]

On Wed, 28 May 2003 12:07:21 +0000, John wrote:

> "Sheldon Simms" <sheldonsimms@yahoo.com> wrote in message news:<pan.2003.05.27.22.34.45.72842@yahoo.com>...
>> Hi all...
>> 
>> I've been working on upgrading my Zip (as you may remember).
>> 
>> When I boot at 16Mhz, I get as far as the blue "Apple IIgs"
>> screen, and then the computer locks up, crashes into the
>> monitor, or occasionally gives me a nice "Fatal Error" message.
>> 
>> In any case, since I can get that far, I suspect I should be
>> able to get it to boot. Does anyone have any suggestions on
>> how to make it a little bit more stable?
>> 
>> -Sheldon
> 
>   I also have a Zip gs at 8 MHz. I *thought* I read a few posts about
> things getting too hot and failing more at higher speed - sort of a
> slow toasting. If that is true, how can you justify slow cooking the
> Zip for a little extra performance?

Upgrading a Zip to 12Mhz or so is extremely common and usually very
simple. It worked for me just by replacing the old 65816 with a 14Mhz
part and plugging in a new oscillator. That much doesn't entail any risk
at all that I'm aware of. Going beyond that requires more invasive
changes.

I'm not too worried about damage though, since most components are easily
replaceable. The biggest problem would be if the Zip chip itself became
damaged. I've never heard of that happening before though, at least not
due to heat or a higher frequency.

-Sheldon