How does the Zip GS chip work?

[philip@labtam.labtam.oz.au (Philip Stephens)]

  I'm curious to know how the Zip chip for the Apple //GS works.  Does it
access RAM and ROM at 8 Mhz, or does it simply cache memory in order to obtain
an average speed up?  Also, where does it get the 8 Mhz clock signal from?
  I've actually ordered a Zip chip, but while I'm waiting for it to be shipped
I thought I'd throw out this question to the hardware gurus on this
newsgroup rather than waiting for the documentation :-)
-- 
=========== Philip Stephens, Systems Programmer, Labtam Australia ============
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