Re: New Find

[Wayne Stewart <waynes@intergate.ca>]

Will Strutts wrote:
> 
> "Wayne Stewart" <waynes@intergate.ca> wrote in message
> 3D47478C.DA2E89DC@intergate.ca">news:3D47478C.DA2E89DC@intergate.ca...
> 
> > On the ZipGS there's usually 2 or 4 large SRAM chips. From the
> > numbers on yours it should have either 8k or 16k cache. It can
> > be easily upgraded to 64k cache for a significant performance
> > jump. The W65C816PL-7 is a faster processor rated at 7mhz. The
> > speed is set by the oscillator, a metal box or can near the
> > upper left hand corner of the card. Speed is 1/4 of the
> > oscillator. Most likely you have a 28mhz oscillator which gives
> > a speed of 7mhz. However it may have a slightly higher or
> > lower speed.
> >
> I think the oscillator said 32mhz on it. I will double check it tomorrow.
> The board seems to work. It takes a long time to boot up since it is
> looking for my Appletalk network which is not up right now.
> 
> I figured it might be a 7mhz upgrade. There are four chips installed
> for the cache so I would assume that it is the 16k version. How might
> I find the 64k cache chips? They look unusually large for RAM chips.

They're Static RAM(SRAM). THEY can be found at most electronic supply
stores. THEY comes in two different widths. Yours is the wider variety,
600 mil. If you're not planning too much more in the way of upgrading
your ZipGS then 70ns wide SRAM will work fine. Examples of the part#s are

84256C-70   F
HY62256A    LP-70

> 
> > You can download a pdf of the manual such as it is from my website
> > http://homepage.mac.com/waynes
> 
> Thanks. I will print it out tonight and look it over. Hopefully it will
> clear up a few things for me.
> 
> > There's some info on the card inthe FAQ which you can find at
> > http://home.swbell.net/rubywand/A2FAQs1START.html
> 
> --
> William R. Strutts - wrstrutts1@home.com - Whatever!
> 
> C'est moi!  <http://www.facelink.com/wrstrutts>
> 
> Just hacking away...