Re: P2B-DS and generic slotkets
- From: "Frank Galphin" <fgalphin@xxxxxxxxxxx>
- Date: Fri, 14 Oct 2005 20:45:14 -0400
"Paul" <nospam@xxxxxxxxxx> wrote in message
news:nospam-2809050108000001@xxxxxxxxxxxxxxxx
> 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
Well I got it working after a little effort. I ordered two of the
Upgradeware Slot-T adapters from Strattton computers. They were the newer
Version 1.1 adapters so
I did not need to relocate resistor R2 to R3 Position as described here:
http://tipperlinne.com/slot-t.htm
But let me tell you what I had to do to make those two PIII 850's cooperate
with each other. It turns out that one of the PIII 850's was set to request
1.70 volts instead of 1.65 volts. Difference in stepping I assume. So I set
the Slot-T's to 1.65 volts for CPU 1 and 1.70 volts for CPU 2. System booted
and recognized two processors. I think YEAH!!!! well that was short lived. I
checked the hardware monitor and guess what? They were requesting 2.0 volts.
Boy was I confused. So just for the hell of it I decided to set both
Slot-T's to 1.65 volts. Well that fixed the problem. The hardware monitor
was reading 1.6 volts. YEAH happiness. I guess the minor voltage difference
was throwing off the onboard voltage regulators. Well anyway like I said it
is now working.
Thanks to Stephan, Paul and all those that helped out.
Frank Galphin
.
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