The internetz lead to this board https://www.ultimateretro.net/en/motherboards/1906

also, if counted correctly, 72x256Kbit = 2304KB without parity or 2MB with parity currently on the board.

These thing creep me out...

But, RAM size is not rocket science.
Look up the first line on the chip, maybe reduced to the significant part that's usually a combination like LLLNNNNNNN with some letters for the manufacturer and some numbers for the geometry, followed by more letters and the access time, which are irrelevant to the size. In this case, what counts would be "MN41256".
That will lead you to some data sheet or even the google snippet will yield some number like 256k x 1, in this case.
That means they have 256 kBits. Divided by eight makes 32 kBytes each, half a C-64.
So yes, 72 of those are two megabytes plus change.

I guess 2MB is not worth using from this card as it would be easier to use EDO, what would this card be worth if I put it on Facebook as untested? Can these ram chips be used on motherboards for cache?

I wouldnt be plugging that into any ISA slots if the offset doesnt match. The most obvious way to design such a thing is to just reuse ISA connector, but map the interface (pinout) in a way most suited to motherboard layout, not to mention relay on motherboard dram controller (no buildin ras/cas demultiplexing or refresh). The last part is probably not the case here since you can see ~PAL20L8B (the one with white sticker) - enough for complete DRAM control logic, but power supply can be on any pin combination resulting in instant smoke show.

> I've gone through all the 386 motherboards I got with this card

oops, so already fried

>I guess 2MB is not worth using from this card as it would be easier to use EDO

what edo?
1 this card was usually the only ram on the motherboard, it wasnt some extra expansion
2 EDO came out 8 years later, there are no 386 systems supporting EDO

>what would this card be worth

$10 is a fair price without corresponding motherbaord

buying the ram chips alone would put a price of around 20€ on it (cheapest chip supplier), adding the card... another 10€. Just slapping a price on it, what I think would be a fair minimum price.

No those ram chips can not be used as cache for a motherboard. dram <> sram

also, you can not use that card on any other computer than the one mentioned.

edit, since you tried it on ISA slots, you likely put +12v and -12v on some signal lines and fried some/all chips on the card. 🙁

rasz_pl wrote on 2022-05-07, 10:43:

> I've gone through all the 386 motherboards I got with this card

oops, so already fried

Dang, missed that . Too bad, so sad. Shame on op.

weedeewee wrote on 2022-05-07, 11:24:

rasz_pl wrote on 2022-05-07, 10:43:

> I've gone through all the 386 motherboards I got with this card

oops, so already fried

Dang, missed that . Too bad, so sad. Shame on op.

For sucks sake I havnt fried a sucking thing so shame returned why do most vogons like to suck everything up and nit pick the ship out of everything what you have nothing better to do ah that's right I'm the fn idiot and mess with the best die like the rest is your motto but I got this fn card with motherboards I fn haven't put the card in the fn motherboards that would be a fn stupid thing to do

I might loose my membership over this reply but suck it it was worth it, to all the other vogons not so far up their own ass well good you've been great don't be a suck

breath slowly 😀 the way you phrased first post ("8bit portion of the ISA bus") it sure sounded like you tried booting it in all of your 386 boards