What XPS model number ? Is it a true XPS P90 model ? There should be a model number on the case somewhere. My old XPS has a label with model number on the back, some it is on the front.

Horun wrote on 2020-11-05, 14:46:

What XPS model number ? Is it a true XPS P90 model ? There should be a model number on the case somewhere. My old XPS has a label with model number on the back, some it is on the front.

Hi, yes it is a true XPS P90. Sorry for not clarifying.

https://imgur.com/a/NdqtJZy

Ok great ! I have many of the old Dell pages from archive org indexed. Hopefully this matches your board.
Unfortunately there are no good pictures of the inside of the front panel....
Here is one main page: http://web.archive.org/web/19961222115021/htt … PMT/default.htm
The board layout: http://web.archive.org/web/19961231003117/htt … MT/00000004.htm

added: According to this: http://web.archive.org/web/19970605232119/htt … sp/flshbios.htm
this is the last BIOS for it: https://www.dell.com/support/home/en-us/drive … driverid=r18651

Horun wrote on 2020-11-05, 22:31:

Ok great ! I have many of the old Dell pages from archive org indexed. Hopefully this matches your board. Unfortunately there ar […]
Show full quote

Ok great ! I have many of the old Dell pages from archive org indexed. Hopefully this matches your board.
Unfortunately there are no good pictures of the inside of the front panel....
Here is one main page: http://web.archive.org/web/19961222115021/htt … PMT/default.htm
The board layout: http://web.archive.org/web/19961231003117/htt … MT/00000004.htm

added: According to this: http://web.archive.org/web/19970605232119/htt … sp/flshbios.htm
this is the last BIOS for it: https://www.dell.com/support/home/en-us/drive … driverid=r18651

Those pages do have some helpful info, thanks! I'm still holding out that someone with this exact same system can share some pictures of the inside motherboard connections though.

Funnily enough, I did pick up a Dell Dimension P90t (exact same case) from the same recycler today. This one works great and is similar but the board is ATX, not AT. Close but yet so far.

mtgmackid wrote on 2020-11-06, 11:44:

Horun wrote on 2020-11-05, 22:31:

Ok great ! I have many of the old Dell pages from archive org indexed. Hopefully this matches your board. Unfortunately there ar […]
Show full quote

Ok great ! I have many of the old Dell pages from archive org indexed. Hopefully this matches your board.
Unfortunately there are no good pictures of the inside of the front panel....
Here is one main page: http://web.archive.org/web/19961222115021/htt … PMT/default.htm
The board layout: http://web.archive.org/web/19961231003117/htt … MT/00000004.htm

added: According to this: http://web.archive.org/web/19970605232119/htt … sp/flshbios.htm
this is the last BIOS for it: https://www.dell.com/support/home/en-us/drive … driverid=r18651

Those pages do have some helpful info, thanks! I'm still holding out that someone with this exact same system can share some pictures of the inside motherboard connections though.

Funnily enough, I did pick up a Dell Dimension P90t (exact same case) from the same recycler today. This one works great and is similar but the board is ATX, not AT. Close but yet so far.

Here is the Dell archive for the P90t: http://web.archive.org/web/19961222115437/htt … xmt/default.htm

Horun wrote on 2020-11-06, 23:54:

mtgmackid wrote on 2020-11-06, 11:44:

Horun wrote on 2020-11-05, 22:31:

Ok great ! I have many of the old Dell pages from archive org indexed. Hopefully this matches your board. Unfortunately there ar […]
Show full quote

Ok great ! I have many of the old Dell pages from archive org indexed. Hopefully this matches your board.
Unfortunately there are no good pictures of the inside of the front panel....
Here is one main page: http://web.archive.org/web/19961222115021/htt … PMT/default.htm
The board layout: http://web.archive.org/web/19961231003117/htt … MT/00000004.htm

added: According to this: http://web.archive.org/web/19970605232119/htt … sp/flshbios.htm
this is the last BIOS for it: https://www.dell.com/support/home/en-us/drive … driverid=r18651

Those pages do have some helpful info, thanks! I'm still holding out that someone with this exact same system can share some pictures of the inside motherboard connections though.

Funnily enough, I did pick up a Dell Dimension P90t (exact same case) from the same recycler today. This one works great and is similar but the board is ATX, not AT. Close but yet so far.

Here is the Dell archive for the P90t: http://web.archive.org/web/19961222115437/htt … xmt/default.htm

I found that earlier, thank you! Thankfully the P90t works great, no issues with that one =)

I've actually got this system here in my possession now (cut leads and all) and I've got some more info to add:

Big surprise, it's an Intel reference board. Intel Premiere (Plato) to be exact. This means I was able to dig up the manual for the board and get proper pinouts needed for the power supply connectors. I'll attach the board's manual to this post. Back in the 90s Dell was a big abuser of rebadging off the shelf hardware, both desktops and laptops, albeit with different power connections now and then (notice Intel boards have two power connector options? Yeah).

I also found I have an entire 2nd board that'd fir this machine that came as a lot of random stuff. That lot also included a couple boxes of power supplies so with any luck, I'll have a spare power supply, too. Worst case now that I have pinouts I can hack something else together.