Re: Accelerators

[pubpc1@library.ucla.edu]

nathan@visi.com (Nathan Mates) wrote,
in response to my reply:
>>Just swap in a 36MHz oscillator for the 28MHz one and you have
>>8MHz.
>
>   Scott, basic math: 8*4=32.

An accidental error.  I did mean a 32MHz oscillator for 8MHz. :)

yeo@pigeon.qut.edu.au (Willie Yeo) wrote:
>	I am not gonna correct Scott's error on the MHz thingy. To 
>oscillator speed divided by 4 = GS speed. i.e. 36MHz crystal = 9MHz.

Thanks, I was planning to correct it myself.

>
>	I was lucky when I bought a 7MHz ZipGSX with 32k Cache, I bought 
>an inexpensive oscillator and pumped it to 9MHz. I'd suggest, if you buy a 
>7MHz/8k Cache version and wanting to attempt to try your luck, you might 
>be able to get a stable 9MHz speed. If you do get a success, you should 
>consider addind more cache.

Agreed.  The Zip from Alltech comes in 7MHz/32K cache configurations,
I believe.

>
>	Anything further, i.e. 10MHz is less likely you would be able to 
>get it. And above that, is a modification that will void your warranty. I 
>HAD one of those, which I was persuaded to part with it ... runs at 
>12.5MHz at 64k cache. It is about 80% stable running ...
>
>	I still have another 9MHz one |8) Which I am *seriously* consider 
>parting as Henrik Gudat polishes the Bernie ][ the Rescue. But then again, 
>it has GREAT sentimental value that I wish to retain |8)

Willie, you may want to take a look at my upgrade "how to" stack from
the ground upload folder (jun97 subdirectory most likely).  Zipgshc.bsq
will show you how to do it reversably (no soldering).

-Scott G.