Re: ZipGSx Upgrade Questions (I've read the FAQ's)

[Wayne Stewart <waynes@intergate.bc.ca>]

Marvin Miller wrote:

> Hi Wayne;
>
> I'm just researching the cache chip aspect of the Zip upgrade and was
> wondering what speed of chips you managed to get?

I found 15ns narrow SRAM locally which I use in the TAG sockets
and 35ns wide SRAM in the DATA. That got me a stable 15mhz but
16 crashed fairly quickly. Tried 15 & 20 in DATA but it didn't help.
I put in a high output power supply and beefed up the leads to that
slot but on my ROM 3 that didn't seem to make any difference.
Actually I'm back to a ROM 3 without the beefed up power leads.
A power surge fried that board and all the SRAM on the ZipGS as
well as the video card in a Mac I had. So much for surge protectors!

>
>
> I was looking at IDT's stuff and found that they *are* making 12ns
> 600 wide SRAM's !! The document was dated August 2000, no less.

That'd probably be enough to get me a stable 16mhz. I'll keep it in mind
but I more interested in working on my IIe at the moment.

>
>
> Anyway, just wanted to know what you had used and what speed you got
> using it. You probably mentioned it before but my brain is getting
> overloaded on the electronic parts issues. Oh, I found a company with
> a distributor in Richmond that does claim to make **ALL** the
> oscillators from 1Mhz ----> 100Mhz. If true, I gues I should be able
> to squeeze every last drop from the Zip! Finding .600 chips will asve
> the $$$ too!!
>
> Best;
> Marvin

I'm sort of tempted to build an adapter and see what the results are with a ZipGS
in a IIe. Likely wouldn't work but I keep wondering

    Wayne