VOGONS


First post, by Delphius

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Hi vogons! I have recently started a collection of various retro computer parts to build a series of different generations of Pentiums through the 1990's. For the most part I have been able to recognize and figure out mostly what I am looking for on each generation I have in my collection. However I acquired a super socket 7 motherboard with an AMD-K6-2/350MFR that I am very curious to get up and running. Not only am I unfamiliar with using this style of motherboard and CPU, but I cannot find any information on this particular motherboard and its power connection requirements. This is a link to a picture of the motherboard on google photos for a high quality image.

https://photos.app.goo.gl/7MNc97crPsgf1ofk6

It seems to be a Foxconn board with a SiS 530 chipset, but I have not been able to find any shred of its existence through googling it or digging through wimsbios.com. The only thing that comes up is a board that has ATX or both ATX/AT options but not this particular layout and power requirements. If anyone recognizes this board or knows a way to find more information on it I would be very grateful. However, I mainly want to get an ATX to AT adapter to power it on and see if it even posts before putting too much time and energy in to the thing. I can see what seems to be standard AT P8 and P9 connections, but I also noticed a 3rd AT style port that I am unfamiliar with. In my research I am assuming it is a P10, though I am hoping to find some confirmation before I order any adapters or plug anything in.

This is the adapter I was considering getting https://www.ebay.com/itm/ATX-20-pin-to-AT-P8- … 09/270818956893 though Im not sure how the 3-Pin would integrate with the PSU. I do not have the motherboard physically available for another week or two, but Im wondering if there is a 3-Pin power connector on the motherboard next to the supposed P10.

It seems this adapter would be more practical with the power button option, but I am not sure if the 3-Pin would be necessary in this configuration or not. https://www.ebay.com/itm/ATX-to-AT-power-conv … id=160786749586

I am just really struggling finding the right information for this, so I'm hoping someone might be a little more familiar and can steer me in the right direction.

Thanks in advance!

Reply 1 of 8, by Delphius

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I finally had success in tracking this board down. It turns out it is from a Compaq Presario 5070. The extra power connector is a 3.3v and the port next to it seems to be a proprietary compaq case switch or something. Hopefully I can get this one up and working soon. 😀

Reply 2 of 8, by dionb

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I think I have the case this board would work with. Mine has a P2-233 in it with a slot 1 board, but same combo of AT P8+P9 connectors and a separate 3.3V AUX connector, also same not-quite-ATX form factor. You can find AT PSUs with an AUX connector, I might even have one here. If I have time later this evening I'll have a look if I have one and if so what happens if I hook that up to this board (yes, I known the risk, but it's completely surplus to requirements anyway).

Reply 3 of 8, by Delphius

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dionb wrote:

I think I have the case this board would work with. Mine has a P2-233 in it with a slot 1 board, but same combo of AT P8+P9 connectors and a separate 3.3V AUX connector, also same not-quite-ATX form factor. You can find AT PSUs with an AUX connector, I might even have one here. If I have time later this evening I'll have a look if I have one and if so what happens if I hook that up to this board (yes, I known the risk, but it's completely surplus to requirements anyway).

Great! It is awesome to know someone here has some familiarity with these boards. I am very excited to get it started. Just finished a full socket 7 Pentium 233 MMX build with Windows 98, updated my Pentium II 400Mhz, and this might be the next one I finish up with. I ordered the adapter listed above after checking the wiring diagram. It appears the P10 port is also connected to 3.3v on the ATX connector so theoretically everything should work. If you have something original kicking around, let me know!

Reply 4 of 8, by Delphius

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I was able to get this board up and running with the atx adapter with the P10 connector included. I had to twist a couple of the switch cables together to activate the atx power but everything seems to be working great! Looking foward to putting this board to use.

Reply 5 of 8, by Delphius

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dionb wrote:

I think I have the case this board would work with. Mine has a P2-233 in it with a slot 1 board, but same combo of AT P8+P9 connectors and a separate 3.3V AUX connector, also same not-quite-ATX form factor. You can find AT PSUs with an AUX connector, I might even have one here. If I have time later this evening I'll have a look if I have one and if so what happens if I hook that up to this board (yes, I known the risk, but it's completely surplus to requirements anyway).

Would you mind sending a picture of your case? I would like to get an idea of what to look for when Im shopping for AT cases for this thing. Thanks!

Reply 6 of 8, by dionb

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Delphius wrote:

Would you mind sending a picture of your case? I would like to get an idea of what to look for when Im shopping for AT cases for this thing. Thanks!

Thing is, this isn't an AT case, it's more like 75% LPX with 25% (u)ATX, this won't fit into any regular AT or ATX case, you'd need an enormous eATX case, mod the extra ports above the regular ATX backplate and then only use the first three slots...

Here's the original case:

Front (note that there was a door over the 5.25" bays):
full.jpg

Rear:
full.jpg

Closeup of the power connectors:
https://tweakers.net/ext/f/eemCuFxrb9cpS2jhf4pjgv7i/full.jpg

PSU label:
https://tweakers.net/ext/f/HZXAYuSQDsqvaxuIcAbonDdY/full.jpg

My motherboard, Slot1 with i440EX (or LX, don't remember exactly):
https://tweakers.net/ext/f/o4Zb66qsgfLkhxur12PmFENE/full.jpg

Btw, I'm not at all attached to this system, I'd be willing to part with it for the cost of shipping. If that's worth it depends mainly on which continent you're on (NL, EU here).

Reply 7 of 8, by Delphius

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dionb wrote:
Thing is, this isn't an AT case, it's more like 75% LPX with 25% (u)ATX, this won't fit into any regular AT or ATX case, you'd n […]
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Delphius wrote:

Would you mind sending a picture of your case? I would like to get an idea of what to look for when Im shopping for AT cases for this thing. Thanks!

Thing is, this isn't an AT case, it's more like 75% LPX with 25% (u)ATX, this won't fit into any regular AT or ATX case, you'd need an enormous eATX case, mod the extra ports above the regular ATX backplate and then only use the first three slots...

Here's the original case:

Front (note that there was a door over the 5.25" bays):
full.jpg

Rear:
full.jpg

Closeup of the power connectors:
https://tweakers.net/ext/f/eemCuFxrb9cpS2jhf4pjgv7i/full.jpg

PSU label:
https://tweakers.net/ext/f/HZXAYuSQDsqvaxuIcAbonDdY/full.jpg

My motherboard, Slot1 with i440EX (or LX, don't remember exactly):
https://tweakers.net/ext/f/o4Zb66qsgfLkhxur12PmFENE/full.jpg

Btw, I'm not at all attached to this system, I'd be willing to part with it for the cost of shipping. If that's worth it depends mainly on which continent you're on (NL, EU here).

Ok cool that gives some insight on whats going on with that thing. I would be interested in taking it off your hands, but I am in the US so im not sure what kind of shipping costs that would entail. But since this might be my only chance for ever finding a match for this thing it might be worth checking in to if your willing.

Reply 8 of 8, by dionb

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To the US... I'd have to weigh it, but no less than EUR 35 (USD 40), probably EUR 55 (>USD 60). Given that this type of system was common as muck in the late 1990s in the US as well as in EU, I'd suggest you're better off looking locally - in those days Compaq was the world's largest PC vendor and this was the standard layout for their home PCs. It should be about the easiest non-standard case layout to find. If you really can't find it and you really want to spend an obscene amount on shipping you're still welcome to it...