Re: How does the Zip GS chip work?

[jaj4922@FERT2.FE.PSU.EDU (Jason A. Jeffries)]

> 
> 
>   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 :-)

The Zip uses a cache to speed up the average access time. Obviously, 100ns
or 120ns RAM, while fine at 2.8mhz, just won't cut it at 7-10+ mhz. It gets
the 8mhz clock signal from an oscillator on the card, and that's also how
you can speed it up--just get a faster oscillator (and processor).

-- 
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		 Jason Jeffries / jaj4922@fert2.fe.psu.edu
   Industrial Revolution BBS   412-437-1718    METAL/FV with Supra 14.4k
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