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Re: ZIP chip these days

PZ wrote:

On May 22, 10:36 pm, David Chiu <n...@nowhere.org> wrote:


Bill Buckels wrote:


I am watching an ebay auction for a zip chip 8000 //e without any manuals or
packaging or anything... it's already up to $110.99 USD and it's not over
for another 16 hours or so. I am grateful for mine and don't plan on parting
with it, but interested to see what they sell for these days...


I've only had a couple of zip chips over the years, but every one of
them were epoxy'ed in with a couple of RAM chips exposed on the bottom.
The pics used in the auction doesn't look like the ones I have had before.



Yes, there were two versions. The 4000/8000 and the II 4mhz/8mhz. One
had the sram visible on the bottom, and the other one didn't.  One
version was more prone to failures as well, but I can't remember which
was which.


The ones with the SRAM chips visible on the bottom are much more
reliable, since the SRAM is separately packaged.  The others have
bare SRAM dice potted in the epoxy, which apparently was much less
effective than the standard plastic package.

IIRC, the -4000 and -8000 are the new design.

-michael

NadaNet and AppleCrate II: parallel computing for Apple II computers!
Home page: http://home.comcast.net/~mjmahon

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