VOGONS


First post, by freesofia

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Hello, I'm looking for a Voltage Regulator Module (VRM) for the 2nd Pentium Pro processor of the newly acquired IBM Personal Computer 365
Nowhere on the internet do I find the exact model to look for at least on Ebay or I don't know where.
Any help, information on this board is welcome.

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Reply 1 of 24, by Horun

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Because that board has Intel chipset and Intel CPU's it should follow the Intel VRM design guidelines, this one should apply to that era (1995) of Intel based P.Pro motherboard
sorry should have added that probably all Pentium Pro VRMS should work, a Pentium or P2 VRM most likely not for various reasons....

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Hate posting a reply and then have to edit it because it made no sense 😁 First computer was an IBM 3270 workstation with CGA monitor. https://archive.org/details/@horun

Reply 2 of 24, by PC Hoarder Patrol

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The info I'm seeing online quotes two different IBM part numbers - 76H1815 and 07H1097 - the first is rated to 11.2A for 200MHz/256Kb cpus and the second is rated to 12.4A for either the 200MHz/256Kb or the 200MHz/512Kb cpu

Reply 3 of 24, by Radical Vision

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What i wonder, what if adding the wrong VRM will result in frying/ destroying the whole machine that will suck...

Also from the online manuals it seems the IBM PC 365 supports max of 512 ram x4 128MB, but not sure about the CPUs 200MHz is maximum, but cache appear to be max 256mb, while 512 cache seems to be not supported...

Someone with the same IBM system, that has the damn VRM module working with x2 pros, will be nice to see the thread and help. I am at the same boat as the guy that created the topic..

Mah systems retro, old, newer (Radical stuff)
W3680 4.5/ GA-x58 UD7/ R9 280x
K7 2.6/ NF7-S/ HD3850
IBM x2 P3 933/ GA-6VXD7/ Voodoo V 5.5K
Cmq P2 450/ GA-BX2000/ V2 SLI
IBM PC365
Cmq DeskPRO 486/33
IBM PS/2 Model 56
SPS IntelleXT 8088

Reply 4 of 24, by freesofia

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Radical Vision wrote on 2022-06-25, 09:07:

What i wonder, what if adding the wrong VRM will result in frying/ destroying the whole machine that will suck...

Also from the online manuals it seems the IBM PC 365 supports max of 512 ram x4 128MB, but not sure about the CPUs 200MHz is maximum, but cache appear to be max 256mb, while 512 cache seems to be not supported...

Someone with the same IBM system, that has the damn VRM module working with x2 pros, will be nice to see the thread and help. I am at the same boat as the guy that created the topic..

In my opinion, this is a mythical IBM module for model 365 😀

Reply 5 of 24, by Horun

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Hahaaa 😁 not a mythical part, same two VRM's were used in the Server 325 and 330 also 😀
https://www.ibm.com/support/pages/processor-a … s-pc-server-330 and https://www.ibm.com/support/pages/specificati … er-325-8639-esv

Hate posting a reply and then have to edit it because it made no sense 😁 First computer was an IBM 3270 workstation with CGA monitor. https://archive.org/details/@horun

Reply 6 of 24, by Radical Vision

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Horun wrote on 2022-06-25, 15:52:

Hahaaa 😁 not a mythical part, same two VRM's were used in the Server 325 and 330 also 😀
https://www.ibm.com/support/pages/processor-a … s-pc-server-330 and https://www.ibm.com/support/pages/specificati … er-325-8639-esv

I find it sucking, as these modules cost 100$ on ebay what a pile of crap... And the chance of finding one locally is close to none..

Mah systems retro, old, newer (Radical stuff)
W3680 4.5/ GA-x58 UD7/ R9 280x
K7 2.6/ NF7-S/ HD3850
IBM x2 P3 933/ GA-6VXD7/ Voodoo V 5.5K
Cmq P2 450/ GA-BX2000/ V2 SLI
IBM PC365
Cmq DeskPRO 486/33
IBM PS/2 Model 56
SPS IntelleXT 8088

Reply 7 of 24, by Horun

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Not sure where you live but this one for not a bad price (the recycle place was 1/2 this but out of stock): http://www.a1usedcomputers.com.au/shop/prodVi … ?idproduct=1845
I checked and the picture is correct !

Hate posting a reply and then have to edit it because it made no sense 😁 First computer was an IBM 3270 workstation with CGA monitor. https://archive.org/details/@horun

Reply 8 of 24, by Sphere478

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freesofia wrote on 2022-06-24, 21:14:
Hello, I'm looking for a Voltage Regulator Module (VRM) for the 2nd Pentium Pro processor of the newly acquired IBM Personal Com […]
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Hello, I'm looking for a Voltage Regulator Module (VRM) for the 2nd Pentium Pro processor of the newly acquired IBM Personal Computer 365
Nowhere on the internet do I find the exact model to look for at least on Ebay or I don't know where.
Any help, information on this board is welcome.

Attaching photos.

photo_2022-06-24_18-42-42.jpg

photo_2022-06-24_18-43-05.jpg

photo_2022-06-24_18-43-09.jpg

km3ab9lww6y81.jpg

You know what, I think it’s about time we made a (easy) DIY way to address this. There are a lot of motherboards out there with this header.

Can you upload the pinout of this, and the socket 7 header and I’ll make a pcb for tapping it. I believe the socket 8 and 7 header may be different. There is supposed to be a builders guide or a spec sheet for this connector somewhere, but I am not hone right now,

Edit: I see someone found the pentium pro guide sheet

anyway, my thought is to combine the pins into pads and make it easy to tap and run it off of the regulator of your choice. Similar to what we have done with the socket 5/7/ss7 tweaker and the socket 1/2/3 tweaker.

Something I ran into on designing the socket 5/7 tweaker is trying to make your own regulator has a huge Bill Of Materials. And requires significant soldering skill to assemble.

Something that can be solved by simply making a device for tapping it, not powering it. And use simple cheap off the shelf power supplies in line on the power cable.

Sphere's PCB projects.
-
Sphere’s socket 5/7 cpu collection.
-
SUCCESSFUL K6-2+ to K6-3+ Full Cache Enable Mod
-
Tyan S1564S to S1564D single to dual processor conversion (also s1563 and s1562)

Reply 9 of 24, by Horun

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Sphere478 wrote on 2022-06-25, 23:01:

Can you upload the pinout of this, and the socket 7 header and I’ll make a pcb for tapping it. I believe the socket 8 and 7 header may be different. There is supposed to be a builders guide or a spec sheet for this connector somewhere, but I am not hone right now,

Here are my Fairchild and Semtech VRM datasheets (with board size and pinouts) for actual VRMs for Intel P5 and P6. If you need something more let me know have a few more on my other computer somewhere..

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Hate posting a reply and then have to edit it because it made no sense 😁 First computer was an IBM 3270 workstation with CGA monitor. https://archive.org/details/@horun

Reply 10 of 24, by Sphere478

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Excellent. None of those pdfs will open on my phone, I’ll check em out when I get home.

Btw, CalamityLime just made a power supply for these pcbs I’ve been making. Depending on the power requirements of pentium pro, it may be able to work here also.
Re: Socket 5/7/SS7 (Voltage Interceptor) Tweaker. (Beta)

Sphere's PCB projects.
-
Sphere’s socket 5/7 cpu collection.
-
SUCCESSFUL K6-2+ to K6-3+ Full Cache Enable Mod
-
Tyan S1564S to S1564D single to dual processor conversion (also s1563 and s1562)

Reply 11 of 24, by Sphere478

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good news, looks like only two devices will cover all three types, in fact, one device may be able to have two ends, making only one device fit all three types.

Attachments

Sphere's PCB projects.
-
Sphere’s socket 5/7 cpu collection.
-
SUCCESSFUL K6-2+ to K6-3+ Full Cache Enable Mod
-
Tyan S1564S to S1564D single to dual processor conversion (also s1563 and s1562)

Reply 12 of 24, by Sphere478

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What do you think of this so far?

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Sphere's PCB projects.
-
Sphere’s socket 5/7 cpu collection.
-
SUCCESSFUL K6-2+ to K6-3+ Full Cache Enable Mod
-
Tyan S1564S to S1564D single to dual processor conversion (also s1563 and s1562)

Reply 14 of 24, by Sphere478

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Damn, listed as 47w that's a needy chip..

No problem, the VRM won't be on the device I'm making it will be external. (like a power adapter) I'll be sure to plan for that amperage on the board.

Okay, so it looks like these vrms used a weird female pin header.

144vno5is2471.png
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do we have a pn for that? otherwise I'll design it for use with normal 2.54mm horizontal headers. but we'll loose a fair amount of room to the pins.

as you can see if I place the normal headers at specified location they hang off the board.

144vno5is2471 - Copy.png
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Sphere's PCB projects.
-
Sphere’s socket 5/7 cpu collection.
-
SUCCESSFUL K6-2+ to K6-3+ Full Cache Enable Mod
-
Tyan S1564S to S1564D single to dual processor conversion (also s1563 and s1562)

Reply 15 of 24, by Sphere478

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here it is with the popular pin headers aligned

not much room left. But it's enough.

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  • hws16307-1.jpg
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Sphere's PCB projects.
-
Sphere’s socket 5/7 cpu collection.
-
SUCCESSFUL K6-2+ to K6-3+ Full Cache Enable Mod
-
Tyan S1564S to S1564D single to dual processor conversion (also s1563 and s1562)

Reply 16 of 24, by Sphere478

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double check me here, lemme know if you see anything routed wrong, wrong size etc. it's 3:45AM here I'm tired 🤣.

Btw the 3d model is of the male connector, obviously you'll use the female connector.

As for what power supply to use with it, do you think a dual VRM version of CalamityLime's board would work? (a single may actually work for some Pentium pros, it's rated for 12a.)
If the cpu takes 3.3v btw, then you may be able to hook up to atx/sata 3.3v, maybe add a noise filter though for good measure.

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-Known error forgot space on listed models.

Use at own risk, check for shorts before powering on.

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  • Back 3D.png
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  • Front 3d.png
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Last edited by Sphere478 on 2022-06-26, 11:45. Edited 3 times in total.

Sphere's PCB projects.
-
Sphere’s socket 5/7 cpu collection.
-
SUCCESSFUL K6-2+ to K6-3+ Full Cache Enable Mod
-
Tyan S1564S to S1564D single to dual processor conversion (also s1563 and s1562)

Reply 17 of 24, by weedeewee

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sphere478, according to the pdf posted in this thread, a pPro also needs 1v5 .

Right to repair is fundamental. You own it, you're allowed to fix it.
How To Ask Questions The Smart Way
Do not ask Why !
https://www.vogonswiki.com/index.php/Serial_port

Reply 18 of 24, by Sphere478

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weedeewee wrote on 2022-06-26, 11:31:

sphere478, according to the pdf posted in this thread, a pPro also needs 1v5 .

5v? Shouldn’t the motherboard supply that?

Where are you seeing that? Screen shot it for me please. Lemme see if I can address it.

Sphere's PCB projects.
-
Sphere’s socket 5/7 cpu collection.
-
SUCCESSFUL K6-2+ to K6-3+ Full Cache Enable Mod
-
Tyan S1564S to S1564D single to dual processor conversion (also s1563 and s1562)

Reply 19 of 24, by weedeewee

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Sphere478 wrote on 2022-06-26, 11:37:
weedeewee wrote on 2022-06-26, 11:31:

sphere478, according to the pdf posted in this thread, a pPro also needs 1v5 .

5v? Shouldn’t the motherboard supply that?

Where are you seeing that? Screen shot it for me please. Lemme see if I can address it.

1v5 1.5V

Right to repair is fundamental. You own it, you're allowed to fix it.
How To Ask Questions The Smart Way
Do not ask Why !
https://www.vogonswiki.com/index.php/Serial_port