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. 😀

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).

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!

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.

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!

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):

Rear:

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).

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):

Rear:

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.

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...