How fast can a Zip GS Go?

[dana...@my-deja.com]

Hello,
I have a Apple IIGS Rom 3 unit,6 megs of ram and ZipGS 1.02. So far I
have a 32MHZ Crystal, 64k of high speed SRam, and the WDC14.
It seems stable at 12MHZ right now, but how far can I push it? What is
the fastest speed knowen on it? Should I add the 74HC00 chip? It is
time to give this thing a 56K modem, and see what kind of damage it can
do on the net.

Thanks,
Dana

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[Wayne Stewart]

dana...@my-deja.com wrote:

> Hello,
> I have a Apple IIGS Rom 3 unit,6 megs of ram and ZipGS 1.02. So far I
> have a 32MHZ Crystal, 64k of high speed SRam, and the WDC14.
> It seems stable at 12MHZ right now, but how far can I push it? What is
> the fastest speed knowen on it?

A 32mhz crystal only gives you 8mhz. To get 12mhz you need a 48mhz
oscillator
The fastest ZipGS I've heard of is 16mhz, most cards top out at 12 to
15mhz
though.

> Should I add the 74HC00 chip?

See how far you can get without changing it. Some cards don't seem to
require
the change. Also the chips soldered in so there's always a small risk in
changing
it.

Wayne

[David Empson]

<dana...@my-deja.com> wrote:

> I have a Apple IIGS Rom 3 unit,6 megs of ram and ZipGS 1.02. So far I
> have a 32MHZ Crystal, 64k of high speed SRam, and the WDC14.
> It seems stable at 12MHZ right now, but how far can I push it?

If you have a 32 MHz crystal then the ZipGS is running at 8 MHz, not 12
MHz. You would need a 48 MHz crystal to run it at 12 MHz. (CPU speed
times four.)

> What is the fastest speed known on it?

I believe that some people have achieved 16 MHz, but I haven't heard of
anything faster than that.