IMO that board looks like a huge pain in the ass whether it takes 4MB or not, and if I was forced to make a guess off the pic, I'd guess not. (4x256 is already a pretty big RAM for the apparent age of that board, and there aren't enough sockets to get any more of those on.)

Agree ! The memory sockets are all populated and cannot take larger ones. Also there is no Cache chips/sockets I can see.
That board is a very unique early full AT 386DX with mostly TTL and not a true full chipset. Can not find any info on it.
I tossed one similar because it had many issues BUT sort of wish I kept it only because of the rarety even if somewhat useless compared to any 386 with SIMM sockets (just my opinion)

Horun wrote on 2021-09-19, 04:59:

That board is a very unique early full AT 386DX with mostly TTL and not a true full chipset. Can not find any info on it.

Since it has 1990 date codes do you think it might have been an industrial board of some kind? Would a big 20MHz 386 board with tons of components have even been cheaper than a more integrated one by that date?

What a beautiful old full AT board! The PWA code makes me think either Everex or Mitac.

Unfortunately without the special memory card, you're stuck with whatever DIP RAM is installed. The memory card presumably plugs into one of those extra-long slots.

Nice board indeed and for $60 on ebay...
finding any memory expansion cards for it will be doubtful.
being located in texas makes the shipping prohibitive for me.

Also doubtful that you can put a 386dx40 on it, and not just because the oscillators are soldered on. the amount of logic chips could make timing issues a certainty.
No cache is also sad. changing the cmos battery implies modding the dallas chip.

oh yeah, and it seems to still have all its tantrum capacitors, those could get fun.

weedeewee wrote on 2021-09-19, 07:31:

Nice board indeed and for $60 on ebay... finding any memory expansion cards for it will be doubtful. being located in texas mak […]
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Nice board indeed and for $60 on ebay...
finding any memory expansion cards for it will be doubtful.
being located in texas makes the shipping prohibitive for me.

Also doubtful that you can put a 386dx40 on it. no cache is also sad. changing the cmos battery implies modding the dallas chip.

Thanks for answer guys. So i won't buy it. I talked with the seller, it would accept a 50$US best offer. Go ahead if you want it. 😀

Shipping & taxes more than doubles the price for me, so I'm out.

Good for museum, but very little usefulness if it doesn't have SIMM slots. 2MB RAM would be good for a 286. When I had 386DX40, 8MB RAM was perfect for it. If you want a good 386, go for that configuration.