Subject: Re: Trouble upgrading a Zip GS
From: Wayne Stewart <waynes@intergate.bc.ca>
Newsgroups: comp.sys.apple2
Date: Fri, 17 Dec 1999 07:38:12 -0800
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In doing upgrades it's usually best to do them one step at a time so
that if
there is a problem you know where to look,
First thing to try would be to reinstall the origional oscillator. In
any case
most machines won't do 16 mhz and usuall top out at 13 - 14 mhz.

If that doesn't work,stay with the origional speed and go back to the
origional cache.

Next try pulling the 14 mhz processor. A lead on it may hove been pushed

over to one side or you might have a defective chip
If you get it working stat the upgrade one step at a time and try slower
oscillators.
I've heard of some few machines that won't go over 12 mhz

Kevin Smith wrote:

> I've had some trouble while performing upgrades on my ZipGS card.  So
> far, what I've done is replaced the processor with the 14Mhz one from
> WDC, gave it a faster cache, and put in a 64Mhz oscillator.  However,
> when I turn on the computer, it doesn't boot up.  The upper left part
> of the screen is black, and the bottom right part is a blocky white
> shape.  I have a Focus harddrive card, and I can see its activity
> light go on when I turn the computer on, and it goes on each time I
> reset with control-apple-reset.
>
> What could be causing the problem?  Is the oscillator too fast?  Do I
> need a stronger power supply to support the extra speed?