Re: 65816

[Liam Busey <buseyl@my-deja.com>]

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. Unfortunetly
> > 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