Daystar Cache Speed

[Jeff Walther]

I recently bought a small lot of IIsi parts on Ebay, but the cache 
card included in the lot is clearly a Quadra cache rather than a IIsi 
cache.   This was actually a good thing in my opinion.

Anyway, the cache is from Daystar.  It has the narrow Quadra PDS 
connector on the bottom.  It has a sticker on it saying 25 MHz.   My 
goal is to take a C/Q650 board up to 40 MHz at least.   Does anyone 
have any experience with these caches as to how limited they are to 
the labeled speed?

It looks like I could replace the SRAM chips and tag RAM chips with 
faster parts I have around, but the four PAL/GALs would be a problem, 
since there's no way of knowing their contents.

Jeff Walther

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