Re: Zip Info

[vmbb!pro-scat!pro-pdunes!earender (Allen Render)]

vmbb!pro-newton!pro-dan!danb (Dan Brown) writes:

>        Did you put in a faster CPU?  The one on the card won't likely run
>faster than 9 MHz (and the one on my 9 MHz Zip is spec'd at 7 MHz).

   Yes, I installed the new W65C816S8PL-14 chip.

>        What is the speed of the cache RAM on the card?

   His original cache ram was 70 ns ram.  I removed the ram in my version
1.01 board and installed it in his.  I have MS6264L-10PC cash ram on mine
which I think are 10 ns rams.  I also set his board to 8K cache on the first
try to test the changes.  No luck with the 50Mhz crystal.

>        Are you sure you installed the crystal correctly?

   Yes, I used a full can crystal osc. at 50Mhz first, and the Yellow led
did not light up.  Then I tried a 60 Mhz osc.  the yellow did light up, but
the board would not work properly.  I believe that 60 Mhz would be 15 Mhz to
the  65816 which I think should work ok.  

**********
  On my ver. 1.01 board with a 50 Mhz crystal I run just fine. but when I
install a 60  Mhz crystal the yellow led will not even come on, but with a 66
Mhz crystal the yellow led will come on but the board will not operate. I am
having a problem with using a higher amount of cache; I can only use 8K. 
With 16K cache the board fails on a regular basis.  I have 25 ns tag ram and
10 ns data ram. I'm not sure what the highest speed I should be able to run
is but I think that it should run up to at least 15Mhz.

> --
>Dan Brown
>pro-dan!danb@pro-newton.cts.com
>Don't Tread on Me.

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