Looks quite close to this one maybe? Some chip positioning is off, but I think that's the closest at stason.org...

https://stason.org/TULARC/pc/motherboards/S/S … B-SYM-486C.html

The one on Stason has ISA slots and a Symphony chipset, while the one in the picture has EISA slots and a HINT chipset.

The layout is similar but majestyk is right. My guess though is that its from the same era?

There is not voltage regulator to bring it below 5v. You could probably use a Pentium Overdrive, any of the 486 Overdrive, or any of the AMD based upgrade chips (486 or 5x86) that have a voltage regulator.

The part number.. looks like "AI486 EISA" makes me think it might be an Advanced Integration motherboard.

The 82C206 controller chip was sold under countless brands like C&T, Opti, UMC, Siemens, IMP...
I wonder if they all came from the same Fab.

A BIOS dump (or a POST screen photo) would help a lot identifying the maker of the board (and potentially find a manual for it).

That sure is a nice Varta Battery ...

...must be fake from China.
It totally failed wreaking havoc on everything.

Given it's EISA you just need to check what the motherboard PnP ID is.

I suspect you could do this from an EISA configuration utility or my SIV utility will report it once you have Windows is running.

In the attached SIV looked up MIC0001 in PNPDEVS.txt to get Micronics EISA 486/33/25 System Board

Sweet! Thanks for all of the replies! I'm going to put it together with 50MHz chip and see how the system does. I had no intention of buying this motherboard but since it came with the case why not? However, if the games I intend to play struggle I'll upgrade the motherboard and put in the 100Mhz chip I have here. I'm trying to avoid it altogether but I'm starting to think that maybe even going Pentium 133/166 might be the way to go. I plan on running Win98SE which I hear is a dog with less than 75Mhz. /shrug. I'll keep you all posted. I will also be starting a build thread at some point.

paprika wrote on 2021-04-17, 05:40:

Looks quite close to this one maybe? Some chip positioning is off, but I think that's the closest at stason.org...

https://stason.org/TULARC/pc/motherboards/S/S … B-SYM-486C.html

Wrong chipset, all ISA instead of 6 EISA/2 ISA, jumper locations are way off. No match. Oh and we're building UH19 just to make it easier to get a proper ID. Without any ads.
https://www.ultimateretro.net/

Currently trying to find a matching board.

So in the end I went with a Pentium motherboard that I found that came with CPU and 16MB of ram. I used that instead. My weekend project is nearly complete!

I put the computer together yesterday (mostly, still waiting on a few parts) and got the machine to POST. So far so good.

I worked on the case and fixed all the issues. Also gave it a nice coat of Seafoam green spray paint. It's kind of a lighter seafoam which I actually like more.

And here is the direction I'm headed with the setup. It's going to have its own special area. This is just a mockup on my dining table 😜

I think it turned out quite nice. Thoughts?

All it's missing is an LGR case badge 😜

Could you make a bios dump from the 486 EISA board so we can add it in UH19 please?

And what Pentium board did you end up with?

evasive wrote on 2021-05-11, 13:15:

Could you make a bios dump from the 486 EISA board so we can add it in UH19 please?

And what Pentium board did you end up with?

Unfortunately I never even tried to power it on. Went straight for the Pentium board. I will try it sometime though. Or I'd be happy to ship it to you if you're interested in checking it out? I'm not even sure it works though.

The Pentium board I got is the J656HXA by Jetway I believe. I've heard it's not the best board for a vintage box but because it had ram and a CPU included all for $50 I just went for it just to see. All part of the fun 😀 I can always get another board later if I want.

Anyway, I will be starting a build thread pretty soon and a YouTube channel as well! The YouTube channel will be about many of my passions, one of the main ones being computers. Old and new.

I also have several vintage IBM Thinkpads I'll be reviewing. Circa 1997-1999ish.

red-ray wrote on 2021-04-17, 10:57:

Given it's EISA you just need to check what the motherboard PnP ID is.

That is a good start, but doesn't always help. I've seen a "no-name" SiS-based EISA board that uses the ID "SIS0000". The Chipset has a progammable ID, and the BIOS should set up a board-specific ID, but this vendor chose to leave the generic SiS ID in the BIOS and shipped it with the basic "so you can get started" CFG file supplied by SiS.

Hey guys. A few of you sent me messages requesting the old board but I cannot reply since I'm a newb here. One of you sent me their email and I'll be replying in the next week or so. Haven't been on here in a while since I got a cold that lasted several weeks and you know...life. I was away from home for several but just came back today. Hoping to play with the machine in the next couple of weeks. Anyway, I do plan on being here more often but you guys all know how it goes. PS - Just ordered an RTX 3080TI today for my current machine 😜.

cruisd64 wrote on 2021-06-04, 07:45:

Hey guys. A few of you sent me messages requesting the old board but I cannot reply since I'm a newb here. One of you sent me their email and I'll be replying in the next week or so. Haven't been on here in a while since I got a cold that lasted several weeks and you know...life. I was away from home for several but just came back today. Hoping to play with the machine in the next couple of weeks. Anyway, I do plan on being here more often but you guys all know how it goes. PS - Just ordered an RTX 3080TI today for my current machine 😜.

Hey, do you still have that 486 EISA board ?