Re: SRAM on ZipGSX - how fast for 14MHz?

["David Chiu" <none@nowhere.org>]

There was a discussion on this topic late last year. Go to www.deja.com and
search for "ZipGS Cache Memory Speeds" for the gist of the discussion...

"Rodney Hester" <rod3@mindspring.com> wrote in message
news:9jqc5g$dle$1@slb4.atl.mindspring.net...
> Right now I'm trying to push a ZipGSX to 13.75 MHz with a 55 MHz
oscillator.
> I've already done the 74HC00 mod successfully.  I'm running 15ns tag RAM
and
> 20ns data RAM, with zero stability.  It won't even finish booting.
Swapping
> for a 40 MHz oscillator (the next closest I've got) cleans up everything
> nicely, as does (usually) putting both 15ns SRAMs in the first (32K)
banks,
> flipping the jumper to 32K cache, and cranking down the speed a notch or
two
> with the Zip CDA while running the 55 MHz oscillator.
>
> Should I have purchased even faster SRAM?  I can get 12ns chips, but I
think
> that's the fastest that is readily available.  For those who have a ZipGSX
> running comfortably at 14 MHz, what speed SRAM are you using?  I'd just
like
> to try to gauge if I'm encountering a non-SRAM problem here.
>
> Rodney
>
>