Need S-RAMs for ZipGS!

[ug0a@rzstud2.rz.uni-karlsruhe.de (Alexander Siegfried)]

Scott G. wrote:
 
 > Try JDR Microdevices (http://www.jdr.com/).  If I'm not mistaken,
 > they will ship overseas.
 
Thanks. Will do.
 
 
 > How fast have you gotten the Zip to go with 70ns in DATA and
 > 15ns in TAG?
 
Currently, the Zip is running stable at 12MHz with 32K cache. Yes,
70ns in DATA, 15ns in cache, plus I had to go down from 64K to 32K
cache. Also, the 74F00N had to be replaced with a 74HC00, but NOT the
74F02 (the system will crash if I change them both).
 
If I clock the board to 15MHz, the GS crashes all the time, i.e. the
current S-RAMs speed combination does not work (I assume the 70ns in
DATA is too slow, should be 45 or 35).
 
 
 > Since I made comparisons of performance using the MegaDemo, which
 > showed that performance levels off at 16K of cache, this was ok.
 
:) Cutting down the cache from 64K to 32K isn't that noticeable, only
in games like Task Force which do a lot of scrolling. However, I
would not recommend going down from 32K to 16K just to get a higher
clock speed.
 
 -- Clue / Ninjaforce