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Re: 65816

On Thu, 14 Jun 2001 18:18:00 -0400, Liam Busey wrote:

> Linards Ticmanis wrote:
>>
>> Wayne Stewart wrote:
>>
>> > I gave a friend all my half size oscillators last year but I have a slew
of
>> > full size ones from my ZipGS upgrade days so I whipped up an adaptor for
the
>
>> > full size and have been running it for the last 4 hours at 14mhz.
Unfortunet
> ly
>> > with a faster oscillator I get an error message. Likely I'm at the limit
of
>> > that 45ns cache.
>> > I imagine like with the ZipGS going from an 8k to a 32k cache would be
about
>
>> > equivelent to a 3mhz speed increase?
>> > Wasn't planning on any further upgrades, now I'll have to admit I'm
awfully
>> > tempted.
>>
>> A bit offtopic, but I wonder, for the Commodore 64 there was until
>> recently a 20Mhz upgrade on the market, the 65816 based SuperCPU. How
>> so, if Western Design Center doesn't have anything else than 14 MHz
>> listed? Or did they make 20MHz 65816s at one time?
>
> Rumor has it that WDC's current 65816 can take well over 14mhz. That's
> the same chip in CMD's SuperCPU.
>
> I suspect that there aren't any 20mhz IIgs es around because the
> available accelerators don't scale that well.
>
> Liam Busey

You might also be reaching the upper limits of the IIGS buss speed as well?


-- 
... Thomas Edison invented the light emitting resistor