Re: New GS/new accelerator

[sporadic@my-deja.com]

I think this thread can now be considered part of the "You Guys Are
Nuts!" thread. :-)

Spending $1000 on a refrigerated case to accelerate a 10+ year old
computer, just so it can go from 12.5 MHz to 20 MHz.  But the return is
much better than going from 700 Mhz to 1 Ghz on the Athlon (60% vs.
43%).

Then again, owning the world's fastest GS does sound pretty cool.  And
this sure puts those "split cache mods" or "crystal replacement mods" to
shame.


Regards,

Jimmy


In article <20000212141344.27224.00002816@ng-fv1.aol.com>,
  supertimer@aol.com (Supertimer) wrote:
> bobryan9@my-deja.com wrote:
>
> >Facts:
> >Apple IIs have a 1 Mhz bus.
> >1 Mhz video
>
> Yes.  The IIGS CPU gets to operate at the speeds of 2.6Mhz
> and 2.8Mhz depending on access to RAM or ROM, though.
>
> >Apple II accelerator (TWGS)
> >can run at 16 Mhz if you're lucky
> >boosting speed from 2.8 to 7Mhz seems like a big increase when you
run
> >programs
> >boosting speed from 7Mhz to 15Mhz seems like a very small increase
when
> >you run programs
>
> Not entirely true.  Boosting speed from 2.8Mhz to 7Mhz
> actually seems to have a very modest effect.  Boosting speed
> from 7Mhz to 10Mhz will make things seem much smoother.
> I have a 12.5Mhz TWGS and I can tell you that 12.5Mhz
> seems to smooth things out A LOT compared to 10Mhz.
> Only at 12.5Mhz do things actually seem snappy.
>
> Given the speed curve I've seen with increasing Mhz of the
> CPU, I think that the 25Mhz is probably when you will
> stop seeing much of an increase due to the bus (although
> cached code will continue to increase in speed).
>
> >Apple II accelerators can have a 100Mhz processor, and still be
hardly
> >faster than a 15Mhz accelerator, because of the bottleneck of the
1Mhz
> >bus and 1 Mhz video.
>
> Probably 25Mhz is where one would stop and figure it would
> not be worth it to change speeds further.  This is my
> extrapolation based on the differences I've seen while running
> my TWGS at different speeds.
>
> >You want an Apple II accelerator.  I do too.  I want my Apple IIgs to
> >go fast.
> >
> >You will not get an Apple II accelerator that will go very much
faster
> >than 15Mhz that will plug directly into the Apple II and output video
> >through the video or RGB connectors on the back of the computer.  It
> >just won't work.
>
> It won't work because of the limitations of the components in
> the TWGS and ZipGS, not because of anything in the IIGS
> or the 65C816 CPU.  The Commodore 64 for example can
> run the 65C816 at 20Mhz with the SuperCPU chip and that
> is a lot faster than the 10Mhz version that was never made.
> SuperCPU can do it but TWGS cannot because TWGS
> (and ZipGS) was made at a time when 20Mhz processors
> were not available.  Thus, the other components on these
> cards do not have the tolerances needed for 20Mhz or
> higher operation.
>
> I'd like to stick the IIGS into a Cryotech PC tower case
> and use the cooling system to deep freeze the TWGS to
> see if it will go very much faster.  Considering that this
> case/cooling system turns a 700Mhz AMD Athlon CPU
> into a 1Ghz unit, I'll bet the TWGS will go at least 20Mhz
> with it.
>
> The nice thing about the Cryotech case is that moisture
> won't condense on electronic components.  There is
> a heater built into the cooling system that extracts the
> moisture before this happens.
>


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