Maybe there are more infos in the bios ?
Do you have anything that could be used to dump it ? (even a pentium era motherboard could do the trick with uniflash !)

You could try using the jumper settings from the other board you found on the internet. Yours seems to have the DIP switches set in the opposite order compared to the internet photo.

I have a 286 with the same chipset. I guess I could dump the BIOS? However my guess is that there is already a dump in the thread on 286 BIOSes.

Or here: http://chukaev.ru54.com/bios_en.htm

Well while dumping your 286 could be useful to someone owning the same board as you, unless your board is identical to his, it's not going to help a lot to identify it ^^

Oh I thought he was not only trying to identify this board, but also get it running. Should have read the thread in more detail. I was assuming a broken BIOS due to the fact that he gets no BIOS messages.

Ah, well I think that's what he wants too 😁. I'm sorry

A POST card could help a lot in this case since there seem to be some activity there

Thanks guys, I will dump the BIOS shortly and report back 😀

computerguy08 wrote on 2020-08-11, 14:35:

You could try using the jumper settings from the other board you found on the internet. Yours seems to have the DIP switches set in the opposite order compared to the internet photo.

Thanks, I did and it made no difference - I even tried to use DIP based on similar looking boards (an extreme long shot, but eh.. )

I am just stumped as to why I get the blinking cursor but absolutely nothing else, no beeps, no attempt to seek anything.. and it happens almost instantaneously

4xtx wrote on 2020-08-12, 14:28:

I am just stumped as to why I get the blinking cursor but absolutely nothing else, no beeps, no attempt to seek anything.. and it happens almost instantaneously

Try to power on the board without any VGA card or memory chips installed. It should beep at you.

If it doesn't, then something else is wrong with it. I see some corrosion near that "burned" crystal / memory socket.

Yeah, corrosion looks quite bad, up to the smaller crystal (Y3) and towards the switch block. Could be worse under the RAM sockets, do you have the tools to desolder them?

I have a (still non-working) board with the same chipset, it beeps at me when powered on without RAM, but doesn't do much else when RAM is installed.

quicknick wrote on 2020-08-12, 21:43:

Yeah, corrosion looks quite bad, up to the smaller crystal (Y3) and towards the switch block. Could be worse under the RAM sockets, do you have the tools to desolder them?

I have a (still non-working) board with the same chipset, it beeps at me when powered on without RAM, but doesn't do much else when RAM is installed.

RAM sockets are actually pretty good - but yeah the Y3 area is in bad shape 🙁

One thing to note is the board is clocked at 12MHz (48MHz/4) and the CPU is 10MHz, not sure if this would cause a problem. Is the CPU abnormally hot?

In 286 machines the keyboard controller is used to reset the CPU, normally the CPU is reset multiple times during boot to get it out of protected mode. If the CPU is stuck in protected mode this can cause it to crash. Check the keyboard controller, make sure none of the legs are bent and that it is seated well in the socket.

It must be executing some code from ROM as the video card will not automatically set a cursor on screen. Did you try the video card in all the slots including the 8-bit slot?
Do you have another ISA video card that is more 286 friendly?

The following ebay listing has a board with the same chipset, says they tried 5 different video cards before they found one that worked.
https://www.ebay.com/itm/Motherboard-286-Delt … D-/133287208586
Listed as a Delta Technologies board it has a similar serial on it '050-4.1-1288'. Model 050? version 4.1? date code 12/88