Yes. Google 440bx and 440gx reference design.

Or see my sig for the bx.

It won't be easy but at least maa14 and mab14 are in the edge of the core

thanks!

looks like i have to disconnect A12 from MA12 and connect to MAA14/MAB14

Maybe. You might need an expert to confirm or explain a workaround.

Why? Because imagine its a spreadsheet.
Will you care that m14 is actually L13 and vice versa as long as it looks right and works?

that's why i asked for any 440gx boardview

They don't seem to exist.
I've looked.

If you manage to find one, let me know.

You did find the gx reference schematic, right?

This guy knows ram making total 32MB 72-simm with 2MB*4 chips

so, i did swap. the good news, its working:

the bad news. it's working not as expected.

by default pins A12 and BA1 are connected to each other:

so i did disconnect A12 from BA1, left connection MAx[12] to BA1, and connected A12 to MAA[14] directly and...

(this is first attempt, A12+BA1->MAA14 . later i rewired)

it does not work. logical levels on signals MAA[14] and MAB[14] are always low.
i connected MAB[14] to pull-up resistor and i can see logical level HIGH for a moment after power-on, then chipset pulling level down.
i even did try use bios from some GX mobos, same here.

what else did i miss?

The pads.

They're probably not NC. Possibly at the dimm end too

What board?

MAx[14] are N/C on any bx440 board.

this is GA-6BXC

A12 and BA1 of the DIMM are connected to each other and MAx[12] of the BX440 chipset.

that's why there is a wires to this pads.

Yeah, they're supposed to be NC.
But the reason 7th gen got a slightly different socket is that motherboard makers earthed NC pins on 6th gen boards.

they're not grounded. i did pull-up and there is a HIGH for a milliseconds after power on, then chipset pulling signal down

Without ram?
I can't find a boardview for that board 😒

with or without. it does not matter
256mb sticks works as usual, none of 512 or 1gb sticks are working

I mean: without the ram installed, and the machine off, it is open circuit?
And with no ram, it still pulls down?

when power off there is no continuity to GND or any other pads, resistance Mohms.
Connecting tester with Diode mode show ~ 0.4 v. drop on both pads. this mean chip is alive and there is connection to the pads

looks like gigabyte messed up DIMM slots.

according to the actual wiring from bx to dimm. BANK2 is actually BANK 0, and etc...

will do rewire MAx[14] according to this new info this evening.

Nice one.

rewiring did not help much -)

i connected oscilloscope to A12 DIMM socket pin and what i got:
board starting, post codes running, init vga adapter, and then, on post code 52, there is a 2 HIGH levels on that signal coming from chipset...

startup video file link : https://drive.google.com/file/d/1gmHo5WDbsiVF … jeImOoyYsHcOJq9

I have no advice for you as this is beyond my technical expertise. However, I wish you good luck and admire your public efforts. Please continue documenting your work for future viewers. This is interesting, informative, and educational!