Re: crashing ZipGS

[gtolar@blkbox.com (Glynne Tolar)]

Albert Chin-A-Young (achin@grace.fiu.edu) wrote:
: I have a modified 8/16 Zip (1.02) running at 10/64. I've tried running
: it in slots 1-4 and it keeps crashing (every few hours). The crystal
: is 40Mhz and the SRAMS are 20ns. The 74F00/74F02N's are still in
: place. Anyone have any ideas? One thing I haven't tried is replacing
: the 74F00 pair with 74HC00 (my next step).

I recently removed the F00/F02s and replaced them with Fairchild parts 
(still F series) and socketed them.  Just for fun I replaced the 74F00 
with a 7400.  EVen at 12MHz it worked.  Well, as well as can be expected 
for my setup.  My Zip will not work at 12MHz reliably for some reason.  
The 7400 just had no effect on the system, good or bad.  So my conclusion 
is the 74F00 is not a speed sensitive component.

Back to my 12MHz wall.  I have Intergrated Design Technologies 15nS SRAM 
installed.  I use to have 25 nS Micro Technologies SRAM.  No real 
difference.  I replaced the cable.  Still no help!  Darn thing is a whole 
I poor money into.  I want to find out if it is the ASIC or the ROM 01!  
<grrrr!>