VOGONS


First post, by SquallStrife

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Yo!

I have the aforementioned adaptor, which I got in a bundle of Slot-1 gear, and I want to mod it for use with an unmodified Tualatin 1.4GHz.

I found this site: http://www.oocities.org/_lunchbox/ms6905_tualatin_mod.html ... which says "The 'Master' versions were properly designed to support Pentium3 CPUs and they accept the typical 3-pin mod."

But no description of what the "typical 3-pin mod" is.

So..... what is it?

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Reply 2 of 17, by SquallStrife

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Hmm, possibly!

Only one way to find out! 😉

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Reply 4 of 17, by gerwin

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When I got a used MS6905 "Master" slotket, there was a Lin-Lin adapter stacked on top of it. Then a tualatin on top of that.

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Reply 6 of 17, by SquallStrife

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Interesting. Thanks for that!

Does that wire-link need to carry much current? If it's not much, I'll probably use some very fine enamelled transformer wire so the chip still sits nicely in the socket.

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Reply 8 of 17, by SquallStrife

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I was thinking I'd just de-solder those 3 pins from the socket, but I haven't actually verified that this is do-able.

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Reply 9 of 17, by valnar

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Hi Gerwin. Do you know where I should be setting the jumpers on that same sandwich? I bought a MS6905 Master, Lin-Lin and Tualatin Celeron 1.4 as well for an ASUS P2B. I don't know where or which jumpers should set the voltage!

Reply 10 of 17, by kaputnik

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valnar wrote:

Hi Gerwin. Do you know where I should be setting the jumpers on that same sandwich? I bought a MS6905 Master, Lin-Lin and Tualatin Celeron 1.4 as well for an ASUS P2B. I don't know where or which jumpers should set the voltage!

Here's a manual with the jumpers explained. Note that those voltage jumpers are just clamps, telling the mobo's VRM what voltage to output. The VRM must support your desired voltage, if it doesn't the mobo will probably not even POST.

Reply 12 of 17, by Skyscraper

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valnar wrote:

Thank you.

How do I set the jumpers on the motherboard?

If it's an old version of P2B the VRM chip only supports 1.8V to 3.5V, if it's a newer version it should support what ever voltage you choose with the slotket jumpers. In any case there is no need to set any jumpers on the motherboard other than the FSB jumpers.

If it's an old Asus P2B (rev 1.02 up to 1.10 or so) you need to set the slotket voltage jumpers to the 1.8V the VRM supports. This is a bit too much for a Tualatin but luckily the Asus P2B is known to undervolt. I get 1.68V idle 1.65V load at the 1.8V setting with a Tualatin P3-S 1400 running on my P2B 1.02 (the first non pre release revision). As long as you get 1.75V or less I think everything "should" be fine. You need to activly cool the VRM section of the motherboard though or it will fail sooner or later.

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Reply 14 of 17, by gerwin

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Skyscraper wrote:

In any case there is no need to set any jumpers on the motherboard other than the FSB jumpers.

Sorry for the delayed response. But Skyscraper said it already.

The MS6905 manual above is for an old revision with a 1.8V limit though. Later versions can go lower: example (I am currently having trouble finding the PDF manual that I use at home.) Setting the slotket to 1.5V at first is the safest bet. You can check it with multimeter to do away with any uncertainty. What is the P2B-B VRM type number, HIP6019BCB maybe?.

P2B boards have no AGP divider jumper. AGP divider is set by the CPU/slotket FSB request signal or something.

A Lin-Lin adapter has a few small jumpers too. But I don't remember using them really.

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Reply 15 of 17, by kaputnik

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gerwin wrote:
Sorry for the delayed response. But Skyscraper said it already. […]
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Skyscraper wrote:

In any case there is no need to set any jumpers on the motherboard other than the FSB jumpers.

Sorry for the delayed response. But Skyscraper said it already.

The MS6905 manual above is for an old revision with a 1.8V limit though. Later versions can go lower: example (I am currently having trouble finding the PDF manual that I use at home.) Setting the slotket to 1.5V at first is the safest bet. You can check it with multimeter to do away with any uncertainty. What is the P2B-B VRM type number, HIP6019BCB maybe?.

P2B boards have no AGP divider jumper. AGP divider is set by the CPU/slotket FSB request signal or something.

A Lin-Lin adapter has a few small jumpers too. But I don't remember using them really.

Oh, crap, the manual I linked looks so much the one I downloaded not long ago. Didn't even bother to scroll down check the jumper table, sorry for that.

Valnar, here's the manual version you want, hope it's not too late:

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Reply 17 of 17, by kaputnik

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Managed to ebay a 1.4GHz Tualeron at a very reasonable price a week or two ago. Successfully Tualatin modded one of my MS-6905 Master 2.x slotkets earlier today to host that CPU. Done a few hours of stress testing now, it's rock stable 😀

Used a variant of the 3 pin mod, since I wanted it permanent, and the slotket to contain the whole mod. Instead of insulating the AN3, AK4 and AJ3 pins on the CPU, I simply desoldered and removed the corresponding contact strips in the slotket. Did the AK4-AN11 bridge by soldering a thin insulated wire to one of the removed strips, sliding the insulation over the solder joint, putting the strip back in place in the socket with the wire through the hole, and then connect the other end of it to AN11. Electrically equivalent to isolating AK4 and bridging the CPU pins.

No need to do the VID mod, since the slotket got voltage selection jumpers.