Re: P2B-DS and generic slotkets

In article <rK6dnTKsOMzsKKTeRVn-ug@xxxxxxxxxxxx>, "Frank Galphin"
<fgalphin@xxxxxxxxxxx> wrote:

> "Paul" <nospam@xxxxxxxxxx> wrote in message
> news:nospam-2009050258060001@xxxxxxxxxxxxxxxx
> > In article <YIedndI8cNDpoLLeRVn-gQ@xxxxxxxxxxxx>, "Frank Galphin"
> > <fgalphin@xxxxxxxxxxx> wrote:
> >
> >> "Stephan Grossklass" <sgrokla-nospam04q2@xxxxxxxx> wrote in message
> >> news:dgkejf$qsv$04$1@xxxxxxxxxxxxxxxxxxxx
> >> > Frank Galphin schrieb:
> >> >
> >> >> Hay all,
> >> >> Well subject says it all. I have 2 PIII 850's which are not the
> >> >> same
> >> >> stepping
> >> >> value. I have 2 generic slotkets the are supposedly dual capable. The
> >> >> system
> >> >> will boot with one of the 850's in slot 1 or slot 2. However when both
> >> >> are
> >> >> installed
> >> >> the system will not boot. The slockets are labeled "Cpu Card Rev.1.0"
> >> >> any
> >> >> ideas?
> >> >
> >> > "Dual capable" could also mean dual *Celeron* (Mendocino) capable, and
> >> > many slot adapters are. This does not imply that dual CuMines work as
> >> > well. Sometimes this also requires changing jumper settings, like on
> >> > the
> >> > MSI 6905 Master. Both the dual capable 6905 Master and the S370-DL have
> >> > a 4-pin CPU selection jumper, which makes me suspect that this is a
> >> > requirement for unmodded dual CuMine operation.
> >> >
> >> > Stephan
> >> > --
> >> > Home: http://stephan.win31.de/
> >> > PC#6: i440BX, 2xP3-500E, 704 MiB, 250+80 GB, R9k AGP 64 MiB, 110W
> >>
> >> Hi Stephan,
> >> Well I tried the PIII 450 slot 1 and a celeron 500 "Mendocino core"
> >> together using
> >> the generic sloket and same as before would not boot in dual mode. Any
> >> other
> >> ideas?
> >> I know i need to find a Asus 370-dl slocket for really cheap. Then it
> >> might
> >> work.
> >>
> >> Frank
> >
> > Upgradeware Slot-T Conversion Kit $30 each
> > http://www.bytewizecomputers.com/products/7/9/104/1048
> >
> > The Upgradeware web page:
> > http://www.upgradeware.com/english/product/slott/slott.htm
> >
> > Modification procedure for making Slot-T (Tualatin) slocket
> > dual processor ready (for PIII-S Pentium):
> >
> > http://www.tipperlinne.com/slot-t.htm
> >
> > I would try the adapter without the modification first.
> > With your processors, the Slot-T may work without any mod.
> >
> > HTH,
> > Paul
> >
>
> Well I kinda got it working. The secret is the N33 pin as described here.
> http://www.hardwarecentral.com/hardwarecentral/reviews/1673/4/
> Both processors are working fine in Dual mode however,
> the voltages are flaky. According to the hardware monitor the
> processors are requesting 2.0 volts instead of 1.65 volts. I really
> don't want to run these processors at 2.0 volts for to long. I don't
> think they will last. What I don't understand about that article
> is why is R3 being removed? What was it's purpose?
> Again any hints suggestions welcome.
>
> Frank

"440bx design guide" - PDF pg.30
http://www.intel.com/design/chipsets/designex/29063401.pdf

"GTL+ is a low output swing, incident wave switching, open-drain
bus with external pull-up resistors that provide both the high
logic level and termination at the end of the bus."

One purpose of the resistors, is to function as the load
resistor and also as a transmission line termination, to
reduce signal reflections. If R3 is a 56 ohm resistor, perhaps
that is its purpose.

A good technical article on modding, should explain what each
of the modifications is doing, and what the old connectivity
achieved before the modder cut it up. Such information makes
it possible for a third party to check the workmanship of
the modder, and interpret what he/she is doing. Since Mr. Sassen
chose not to help us in that way, it is hard to say what he
has done.

For example, I don't understand why Mr. Sassen has connected
a 56 ohm resistor to ground. It could be that this grounding
resistor is physically underneath where R3 is located on
the other side of the board. In other words, a signal used
to have a 56 ohm resistor to Vtt, and now it has a leaded
resistor connected to ground, on the other side of the board,
as a modification. A 56 ohm resistor might make a good high
speed termination for some kind of logic, but if the signal
on that line is GTL+, a pullup resistor to Vtt makes a lot
more sense.

Without a schematic diagram or a block diagram of what he has
done, I would need the module in my hands to figure out what
has been done.

With regard to the voltage being requested, use an ohmmeter
to see if there is continuity from the VID pins in the socket,
to the SC242 edge connector. It could be the slocket doesn't
have them wired, or there is a DIP switch or something ? Are
you sure the slocket doesn't have a way to modify the VID
value ?

This article describes how to do a "wire trick", in a situation
where there is no DIP switch to set the Vcore voltage. When
I needed to do a mod like this, I just cut the appropriate
VID tracks near the edge connector, and wired the signals as
required. (I modded a slocket that had no VID jumpers.)

http://www.tipperlinne.com/p2b-ds.htm

Other info:

http://developer.intel.com/design/chipsets/440/documentation.htm

(A dual processor 440BX motherboard schematic. This will not
teach you much, as the real action is on the slocket. Still,
this is one of the few reference schematics available for
download.)

http://www.intel.com/design/chipsets/designex/BXDPDG10.PDF

Paul
.

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