WxMan1

I need to ascertain the presence (or absence) of SMD's of non-Celeron PIII-S 1400Mhz CPU; this is a socket 370 fcpga2 chip.

Any assistance you can provide would be greatly appreciated.

Ideally I'd like to see the pin-side surface of a SL6BY PIII-S 1400 CPU (although I'd imagine that any non-Celeron PIII-S Tualatain should be similiar).

Tyrsonswood

I've got a pair of 1200 Tualatin I could get a photo of later today, not sure if they are the same as 1400 or not. They are at least "Non Celeron"......

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Tyrsonswood

Here's what I got...... They are a pair so the model number on the one is the same as the one upside down. Best my wimpy camera can do.

Attached Thumbnails

 

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WxMan1

I seriously appreciate the effort of yankin' the HSF off on my account and then having to slap everything together. The pic is of excellent resolution for me to be able to read the processor model number.

Here's my condundrum, the CPU I have is a PIII-S SL6BY 1400/512/133/1.45 and yet it appears that three SMD's are missing; the very topmost one and the two immediately below it. In the location of those three SMD's would be is occupied by golden dashes about the size of the two golden dashes on the left side. Each golden dash is composed of precisely four segements each, and within each segment can be seen two very tiny holes each. I can't ascertain whether or not anything was ever mounted there. However, there is a sticker with Chinese characters that is covering the golden foil where the topmost leads for the very topmost SMD would be placed. So it seems unlikely.

However, the markings of the dashes and dot along the left side of the pins is different than yours (and any other Tualatin I've ever seen on the web). That is the topmost dash on the left side has a small dot immediately below the dash). There's a dash below that, and a dot in the lower left corner. The dashes and dot are in the identical place as in your picture (and any other picture I've seen on the web), but the topmost dash on mine has a dot that's about 1/2 size as the dot in the lower left corner.

So I don't know if the particular PIII-S is have is a special animal or what in that regard. To complicate matters, on the chip surface is an HP sticker placed alongside the IHS with the numbers 317023. This sticker is on the opposite side of where the hole is in the IHS, and on the side between the two black stickers indicating origin, model #, proc serial number and the speed.

My problem is I can't get the CPU to powerup (no POST). I've implemented all the mods indicated below:

Running a Tualatin CPU on a i440BX chipset based mainboard
Martin's Socket Modding Guide

I used a strand of 80 pin IDE cable for wire wrapping of the pins that are indicated to be connected, and isolated the appropriate pins in the socket itself by placing tiny strips of paper into the socket holes. No dice though. The CPU just aint powering up.

I have a socket 370 adapter w/voltage jumpers capable of Vcore configuration as low as 1.3v and am of the impression the socket and or CPU mod should work on my board - P3V4X - with the BIOS revision I have, i.e., 1006.004. Furthermore, I researched the datasheet for the voltage regulator on my board, i.e., HIP6021ACB. It is fully capable of addressing voltages as low as 1.3v also.

To complicate matters even further, there's a seller on eBay advertising CPUs with the mod built into the CPU:

http://cgi.ebay.com/Tualatin-P-IIIs-...item414e3b8fa5

Which is identical to the mod described here:

Main :: Information of Tualatin CPU :: What's a Modified Tualatin CPU? ~ Runboard

If one examines the images of the CPU pin grid, they both look like yours; no missing SMD's, nor does the dash on the left side have a dot immediately underneath it. There is, however, differences noticeable in the modded CPU between what is described in the aforementioned CPU or socket mod links and the images for the eBay CPU auction and the modified Tualatin link. However, the former mods are specifically referencing modding Celerons. The CPU auction is specifically for the SL5XL or SL6BY model CPUs. Furthermore, the seller is clearly identifying the chipset on my board (694x) as being compatible with the mod.

So maybe the problem is that the non-Celeron Tualatin CPUs have different electrical interface than Celerons? That doesn't make sense FCPGA2 is FCGPA2 isn't it? And what about the missing SMDs? In any case, I'm going to have another stab at modding the CPU according to the pinout for the modified Tualatin CPU links and see how that goes. I just wish I knew what value of resistor the mod is using between some of the pins. In the one socket modding guide a reference is being made to use 1k Ohm between AK4 - AK26.

While the numbers are difficult to make out, my guess is on the order of 150 Ohm SM resistors are being employed. In the short term, just to ascertain bootability, the resistors probably won't matter. If somebody has any input on what value resistor to use for these jumpers I'd be very appreciative.

EDIT: update eBay URL to an auction that's current.

Tyrsonswood

Actually the board was out and heatsinks pulled, so no big deal.

I just looked at a Celeron I have and it looks pretty much like what I posted..... I never paid attention before, I guess, and was wondering if all components were there. It's possible HP ordered enough chips that they requested a change internally..... ??? I don't know.

Have you seen it run in an un modded situation?

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WxMan1

I have no clue if the chip is good or not. All I know is the discrepency between the SMD's, and the stinkin' dash and dot thingy.


I paid $15 for it from eBay. Seller lives in Shanghai.

You've got a PIII-S Tualatin with all the SMDs. That makes it 133 FSB & 512KB cache. I have no idea what those things are good for. I looked at Intel's datasheet about the Pentium 13micron process and its worthless for what I'm lookin' for. Nor do I know what the significance of the dotted dash thing implies. You think its possible that HP has custom Tualatins that run only on HP boards? The bastards.

I'm going to eMail the guy who posted the Tualatin chip mod and find out if I can get details on the value for the SMD resistors used in jumpering the pins. As nearest as I can make out in the images it looks like the number is 151. That would translate to 150 Ohms. I'm going to wire wrap the pins implicated for jumpering, and isolate the ones implicated there.

I looked into the pinout to see what's up with that and it looks like AK4 - AJ5 is VttPWRGND to VCC. AN3 & AJ3 don't appear to require isolation (DYN_OE & RESET2# respectively), AK22 is CMOSREF, and G35-37 translate to VTT - VTT. While I was aware of that jumpering, the Tualatin chip mod shows the pins to be isolated. The two being then connected with a resistor to N37 (NCHCTRL). Then the other pins in the corner all relate to VID0,1,2 & VID25mV. The way that's being done is unlike the socket / CPU mod guide for the Celeron Tualatin. The Tualiatin chip mod VID jumpering / isolation makes sense though, based on those guides. The only additional pin mods pertains to AE37 to AD36 (FLUSH - VTT). The remaining jumper is between AF32 - AJ31 (VSS - BSEL1). On one of the discussion threads that was mentioned (but was deemed unecessary).

WxMan1

I've finally got a box goin' - I had to do the ol' hack the BIOS microcode trick.

Now I've got a PIII-S 1400 runnin' at 140 FSB.



Seems to run a bit warm though - idle @ ~58 Deg. C. - that and the 19" Trinitron CRT monitor do seem to keep the apartment warm though. SETI does cause some concerns when it pops in. But I heard there's one promising green shoots and a pony (with wings and a pointy nob on its forehead) that shoots skittles out of its arse at everybody. I really really want one of those.

BlueMak

Wouldn't it be cheaper and faster (energy wise) to use a netbook for SETI?

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