majestyk wrote on 2022-09-17, 06:41:

Here´s one jumpered for Intel DX4 (detailed pictures):
https://www.ebay.ca/itm/185550652355?

Supposing this setup was working you might try it.

Yes, but it is Intel DX4. It is officially supported, but will not work for AMD

This was just in case the TO can´t find a manual.

Excuse me for not getting back to you until now.
I had a pretty stressful Saturday.

First and foremost, today, I managed to find the correct manual for this board.
Second, I've decided not to bother with the AMD 486DX4 anymore, as it caused me too much trouble.
Instead, I'm going to get the Intel A80486DX4-100.

In the future, I'll look for a better socket 3 board.
With a bit of luck, I might even find a VIP board with a proper VRM.
Till then, I'll keep sticking with the 486DX2.

Once again, I'd like to thank anyone who has helped me.

There's something else I'd like to talk about.

On the bottom side of my board, I noticed something strange.
It looks like there was something soldered in between Pin 1 of jumper JP27 and Pin S19 of the CPU socket. (Perhaps a VSS pin?)
The component itself is missing.
I can't figure out what component was once there. Maybe a diode or a resistor, or just a bodge wire?
Out of curiosity, does anyone know what purpose this modification could've served?

For anyone who has the exact same board, does your board have this modification too?

Thanks in advance.

There is nothing there on my board, but my revision is 2.1