Re: Zip GS Upgrading

[Rubywand <rubywand@swbell.net>]

Sheldon Simms writes ...
> 
> On Wed, 28 May 2003 12:07:21 +0000, John wrote:
> 
 ....

> >   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

     There are some ideas in the FAQs at ... 

ftp://ground.ecn.uiowa.edu/apple2/Faqs/Formatted/Csa2ACCEL.txt or
http://home.swbell.net/rubywand/Csa2ACCEL.html

     One easy try seems to be replacing the 74F00 with a 74HC00. Beyond that
you get into swapping in faster RAM and/or increasing supply voltage to the
board to 5.5V.

     Increasing the board voltage seems like a bad idea. You may be able to
avoid it if you go for 14MHz.



Rubywand