Shponglefan wrote on 2023-07-19, 12:07:

I have a motherboard I pulled from a 486 system and I'm trying to find info or a manual for it.

It's a socket 3 board with a UMC82C482AF / UMC82C481BF chipset.

I tried googling the number on the board "P404F0010B", but that returned zero results.

Doesn't seem to be on the retro web (yet!), but based on their other boards there it appears likely to be the EFA 4DMU-HL3

Can you dump the BIOS? Usually there's a manufacturer code in the ID string (unless it's an unbranded clone).

PC Hoarder Patrol wrote on 2023-07-19, 19:16:

Doesn't seem to be on the retro web (yet!), but based on their other boards there it appears likely to be the EFA 4DMU-HL3

Thank you, that does help! I had tried Googling the 4DMU-HL3-L4-VB model number, but only got a single result.

At least I have something to start with in figuring out what the jumpers do.

TheMobRules wrote on 2023-07-19, 20:19:

Can you dump the BIOS? Usually there's a manufacturer code in the ID string (unless it's an unbranded clone).

Looks like an EFA board based on what PC Hoarder Patrol found. But there is virtually nothing on the internet about this specific model...