Re: Beyond ZipFAQ-Name that chip...

[pubpc1@library.ucla.edu]

"Dr. M" <mgruen@ambrosia.dfwmm.net.BAD> wrote:
>Okay, I was also contemplating souping up my ZipGS and started
>rereading all the FAQs on the subject.

If it is the FAQ that Nate maintains, then the information is outdated.
For example, both Matt Portune and myself _did not_ need to replace
(desolder) the integrated circuits that his FAQ claims needed to be
replaced to get 15MHz (Matt's Zip) and 13.75MHz (my Zip).  Notice that
both units are running above 12.5MHz.

>I'm presently running an 8/32 at 10/32 speeds from a new oscillator. I
>was pricing a 14 mhz chip and the RAM, but out of curiousity I looked
>at what I already had on board:
>
>TAG: KM62256ALP-10L 214B (Korea)
>Data: (Integral sign)dt 71256 545P(delta) 8937M
>
>These are the chips that Alltech installed.
>
>What are the specs on these chips?  Is that tag RAM REALLY 10ns? These are
>all 6mm chips, do they need to be replaced or can I just get two additional
>chips.  Can anyone tell me if these chips can still be found in that case?
>I'm figuring only on going to the 12.5 mhz cap as I have no interest in
>doing soldering.

Unfortunately, that -10 means 100ns, not 10ns.  :(

I have 70ns in DATA and 15ns in TAG and the Zip runs stable at 13.75MHz
_without_ soldering in the new gates that Nate's FAQ claims I need to.

You can find the chips of the right speed and size at
http://www.jdr.com/
(Take a look at my "Illustrated Guide to Upgrading the Zip GS" HyperCard
IIGS stack, which can be found at on the ground site and is much more
clear and updated than Nate's dated accelerator FAQ.  Look in
http://ground.isca.uiowa.edu/apple2/apple16/Hypermedia/Hypercard/
for ZipUpgrade.SHK).

-Scott G.