Re: More ZipGS Upgrade Woes!!

["Marvin Miller" <marvinmiller@hotmail.com>]

Hello RubyWand;

Thanks for the reply. I printed off your reccomendations and tried them out.
I removed all cards except for the Zip and the Memory Card. I know that the
system has no problems with the Zip, Second Sight, SCSI, & Memory card but
to be sure I removed 'em all. I than cleaned the contacts on the new -14
chip and re-inserted it. It went in with a satisfying click.

I tried booting up and the same thing. I can actualy get the copyright and
Rom 3 screen but than nothing. More typically is garbled display and
flashing cursors with the odd fatal system error message.

As far as the 74F00 goes, mine has been replaced with a known good 74HC00. I
do not have the original 74F00 to try anymore. Just to sum up;

-I cleaned all pins
-I eliminated any power supply concerns
-I'm running the 74HC00 chip
-The old -7 chip will work while the new -14 will not. Both carry identical
part numbers except for the speed rating.

Has anyone out there had problems with the new -14 chips? Is it possible
that the chips have been changed in some way as to make them not compatible
with the Zip Gs or TransWarp?

Best & Hoping for continued help.....

Marvin Miller




"Rubywand" <rubywand@swbell.net> wrote in message
3A771EE8.7591F893@swbell.net">news:3A771EE8.7591F893@swbell.net...
> Marvin Miller writes ...
> >
> > Hi Friends;
> >
> > I got a new WDC processor for my ZipGS and am having problems with it. I
> > suspect it's DOA but could use some more opinions...
> >
> > Card works well with the old -7 proc but as soon as I install the new
> > W65C816S8PL-14 proc the computer dies.
> > When I re-boot with the new chip the screen appears garbled etc.
Sometimes
> > you can get to see the ROM 3 screen but than nothing. Other times I get
an
> > error code;
> >
> > Fatal System Error 0682
> >
> > I mean it's pretty simple - pull one chip & install the new one. I've
tried
> > several times and the net result is that the old -7 works fine, the
new -14
> > does not. The pins all look good.
> >
> > Just wanted to check to see if there might be something simple I'm
missing -
> > this happens all the time!!
> >
>  ....
>
>      A bad chip is a possibility. It does not seem likely, though.
>
>      One thing to check is the contacts (pins) on the new '816. Look at
them under
> a magnifier with good lighting and see if you detect any pins that look
dull. If
> you do find one, try (carefully) scraping the lead with a needle or small
jewler's
> screwdriver to get shiny metal.
>
>      The new '816 may use different kinds of inputs (requiring different
"1" and
> "0" voltage levels) in at least a few places. A fairly easy try at fixing
things
> is to pull the 74F00 and plug in a 74HC00. This is a standard part of
speed
> upgrades which should probably be done whenever a new '816 is swapped in.
>
>      Something else to check is that your IIgs is not running with low
voltages:
> especially, low voltage on the +5V line. If you have any power-sucker Slot
cards
> plugged in and have not done any of the usual power supply and motherboard
mods,
> you may be getting just enough voltage to run the old '816 but not enough
for the
> newer version. (A test would be to see if-- with power OFF-- pulling some
Slot
> cards fixes things.)  For more effects of heavy loading and fixes, see
> http://home.swbell.net/rubywand/Csa2POWER.html .
>
>
>
> Rubywand