More ZIP stuff...

[JJeffries@psu.edu (Jason Jeffries)]

I'm playing with my Zip 1.02... I've replaced my SRAMs with seemingly
good 20ns parts, upgraded to a 74HCT00 (now available at your local
Radio Shack, BTW). have an assportment of crystals, etc... I still only
have my 10mhz processor, though--I WILL order a 14mhz part RSN...

The Zip/TWGS FAQ listed some dhrystone benchmarks...
My Zip running with 14mhz/64k (it's not stable at all--just crashed
wonderfully, in fact--just playing with it to get the 14mhz "feel")
gets 877 dhrystones/ 2631 dhryASMs under GNO. The FAQ reports
dhrystones in the 1000's--why am I not achieving these speeds? What
other benchmarking programs are available, if any?

The Zip seems to "round" the speeds of the oscillators I use. I have a
48 and a 50 (I've scavenged them--look on old PC video cards); both
result in 12mhz. 
My crystal for 14mhz operation is actually s 56.644 mhz part--strange
but it works.

Is there any way I can test cache RAM, other than doing many RAM
intensive things and waiting for crashes? The TWGS, if I remember
correctly, had a cache test built-in. Is there an similar application
for the Zip?

What does putting caps on the cache SRAMs do, and how does one do it?

Lastly, while working on my Zip, I noticed there were parts that seem
to be "missing". What's missing, and can these parts do anything to
enhcance my existance if I were to put 'em on?


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Copyright Jason Jeffries - Not for distribution on Microsoft Network.
My lame WWW Page:http://www.fe.psu.edu/students/jeffries.html
I seem to be addicted to something that doesn't really exist...