Re: crashing ZipGS

[o9938156@unicorn.it.wsu.edu (mark lyon)]

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).

This sounds like the evil SRAM problem.  The Zi seems to have 
problems with a lot of different brands of ram chips.  One
thing to try:  I've had some luck with shielding the card with
aluminum foil.  You've got to be careful not to short anything
on the card, though.  I've got one piece over the non-component
side, and one rectangular cover for each sram chip.  With it I'm
running at 10MHz with some ISSI chips that wouldn't even boot at
8MHz unshielded.  One thing to watch for:  if your zip is crashing,
there is the possibility that your system software has been subtly
corrupted.  I've had to reinstall my system software a couple of
times after trying to push my Zip.

Mark Marr-Lyon
o9938156@unicorn.it.wsu.edu

: albert