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

[marvinmiller@hotmail.com (Marvin Miller)]

Sorry to hear about your frying experience! I use APC products
exclusively for power preotection. They cost more but are the 'real
McCoy'. I just sold my 3KvA UPS but I kept a Pro8 TV for my Apple. No
battery power but it _will_ eat any spikes or surges for breakfast!

I'm trying to source those parts and having some difficulty. I tried
Active Electronics in Vancouver (was reccommended there) but they were
of no use.

Can you think of who is the largest outfit in Canada? I've got my
shopping list together but I suspect people are going to come back to
me with more n/a's like Action did.

Best;
Marvin

PS> Just on the cache RAM side, using David Empson's chart as a guide,
the fastest the RAM _should_ be able to go was around 19MHz using a
soon to be available 10ns Tag Ram. 

Now I know all things aren't equal, but at least coming up with a
rough cache memory speed limitation scenario helps to look into other
areas of limitation.



On Mon, 13 Nov 2000 13:31:48 -0800, Wayne Stewart
<waynes@intergate.bc.ca> wrote:

>
>
>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
>