Re: IIGS - Clock/PRAM chip

["Henry" <apl2research(.a.t.)comcast.net>]

Hey Michael.

May I ask what is the location of the PRAM in the IIgs?  I can't seem to 
find where the battery traces go.

I have some dead IIgs Motherboards here.  Maybe I can pull the IC and send 
them to John and Polymorph.


John:  I can always send some new connectors for the battery pack if you 
want to try that.


-- 
Henry S. Courbis
www.ReactiveLegacySystems.com
www.GSE-Reactive.com
Legacy Hardware and Support - Come take a look at what we have to offer!


"Michael J. Mahon" <mjmahon@aol.com> wrote in message 
c4idnVTPZIEHnEjYnZ2dnUVZ_qOpnZ2d@comcast.com">news:c4idnVTPZIEHnEjYnZ2dnUVZ_qOpnZ2d@comcast.com...
> sundown@nwrain.net wrote:
>> Thanks for the reply.  Yes the batteries are connected with
>> the right polarity.  The clock keeps good time but when I
>> turn off the computer it does not save the time or PRAM.
>> I am assuming the battery is used to save this info and
>> since they are connected properly and good it might be
>> the chip but I have no idea what is wrong.
>
> If it were the chip, then it wouldn't work when the computer
> is on either.  It has to be between the battery and the chip,
> and there are only some wire and a diode, or so.  The diode
> could be open, but that would be a rare failure.
>
> Look carefully at how the battery pack is attached to the
> board.  I'd be willing to bet that there's a bad connection.
>
> I don't know what kind of wire is used, but it's possible
> for the wire to be broken inside the insulation, particularly
> if it is thin solid wire.  Perhaps the solder joint is a "cold"
> joint, making bad electrical contact.  Perhaps it isn't soldered,
> just twisted--which is another place that the contact can be bad.
>
> Do you have a multi-tester or voltmeter?  Or an LED with a
> 470 Ohm resistor in series?  ;-)  If so, check for the presence
> of about +3.6v between the Vcc and Gnd pins of the clock/PRAM
> chip.
>
> -michael
>
> NadaNet networking for Apple II computers!
> Home page:  http://members.aol.com/MJMahon/
>
> "The wastebasket is our most important design
> tool--and it's seriously underused."