Re: More ZipGS Upgrade Woes!!

[Jason <someone@somewhere.com>]

Marvin,

I have upgraded both my Transwarp and my ZipGS with the 14MHz 65816's from WDC.
The pinouts, voltage levels and inputs are identical.

As long as the oscillator has not changed, there is absolutely no reason that
the 7MHz chip will work, and the 14MHz version will not except:

	the 65816-14 is bad

You already knew this.  I am just confirming your suspicion.

I would return it to WDC and wait for a replacement.

Cheers!

--> Jay
(jkett8 AT gte DOT net)


Marvin Miller wrote:
> 
> 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